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scdct2578 rev c functional block diagram ct2578/ ct2581 simple remote terminal standard products june 6, 2005 for mil-std-1553 / 1760 & mcair www.aeroflex.com/avionics features ? complete rt protocol ? meets mil-std-1553a/b & mil-std-1760 ? simple interface ? dual transceivers (1553 / 1760 or mcair) ? +5v - only power supply ? low power (0.15 watts per channel) ? only validated messages transferred ? optional data wrap around ? packaging ? hermetic ceramic - 119 lead, 1.335" sq. x .15" pga - 84 lead, 1.165" sq. x .14" cqfp ? store released signal ? any message may be illegalized ? mcair reduced response time option (inh mc1f) ? optional 1760 checksum ? 1760 header word identification ? latchedrt address ? mil-prf-38534 compliant circuits available ? designed for commercial, industrial and aerospace applications ? aeroflex is a class h & k mil-prf-38534 manufacturer status register rt protocol status register command register watchdog timer 16 bit transmit buffer manchester decoder transeiver encoder / decoder 1760 options store released header word ident 1760 checksum generation/validation 32 word data memory word counter last command reg bit register remote terminal state sequencer manchester decoder 16 bit receive buffer watchdog timer 16 bit transmit buffer manchester decoder transeiver encoder / decoder manchester decoder 16 bit receive buffer bus 0 bus 1 cmd / hrd / data
scdct2578 rev c 2 general description ct2578 is for use in simple remote terminal applications without the need for a processor or software development. it provides the complete protocol for a remote terminal, supporting all types of message transfers including all 15 mode codes, with comprehensive error checking. error handling of data is not required by the subsystem. the user interface is a 16 bit bidirectional highway with a few control lines. the low power transceivers are capable of providing the output voltage required by mil-std-1760 and are powered by a +5v supply. if sinusoidal (mcair) transceivers are required then the part number becomes ct2581. this is the only difference between ct2578 and ct2581. a 32 word data buffer memory is used to store messages until validation is complete. only validated messages are transferred to the subsystem at a rate of 500ns per word. data to be transmitted is transferred from the subsystem to this buffer memory at a maximum rate of 1s per word. this data memory may be bypassed in the receive mode and data transferred to the subsystem on a word by word basis as it is being received. the device has an optional rt wrap around capability. when wrapen is active, data received at subaddress 1e (30) remains stored in the data buffer memory (i.e. not transferred to the subsystem). if followed by a transmit from subaddress 1e the same data will be transmitted. there is an option within the device to reduce the response time in order to conform to other standards such as 1553a and mcair. in this mode subaddress 1f is allocated a normal subaddress with subaddress 00 reserved for mode commands. any message may be illegalized by applying an active low on the nme discrete status input. the remote terminal will respond with the message error bit set in the status and not use the information received. a hardware implementation of the 1760 checksum algorithm within the device may be enabled via signal nenchk. when transmitting, the checksum word is inserted in the last word position, and when receiving, a valid checksum word will generate the open drain output (status). the status output may be hard wired to any of the discrete status inputs (e.g. service request), if it is also hard wired to the input nillcmd the device will respond to a failed checksum with the selected status bit set and not use the data (i.e. not transfer the data to the subsystem). in addition to the signal nvcr (valid command word received) which may be used to illegalize commands, a signal nhdr (header word received) is available to the subsystem for verification of the 1760 message header. the rt address lines are latched on reset as required by 1760. if all six rt address lines go open circuit the store released signal (strel) will go high. the device is packaged in a 119 pin grid array or 84 lead cqfp package. signal descriptions 1553 / 1760 data bus databus 0 signal is connected to the positive side of the external data bus transformers for bus 0. ndatabus 0 signal is connected to the negative side of the external data bus transformers for bus 0. databus 1 signal is connected to the positive side of the external data bus transformers for bus 1. ndatabus 1 signal is connected to the negative side of the external data bus transformers for bus 1. hard wired addr a-e (inputs with pull up resistor) remote terminal address inputs for the unit. addr a is the least significant bit and addr e is the most significant bit. these inputs are internally latched every time the unit is reset. the latched address information is then compared to the incoming command word. addr p (input with pull up resistor) parity bit for the remote terminal address inputs. addr p must be set to odd parity. this input is latched as above. wrapen (input with pull down resistor) select remote terminal wrap around to subaddress 1e. the bus controller sends data to subaddress 1e which remains in the data buffer memory and is available to be sent back on the very next command by the bus controller. the data in the data buffer memory in this mode does not get transferred to the subsystem. if the very next command is not a transmit command to subaddress 1e, the data buffer memory is flushed and will respond normally to the next set of commands. if the wrap around test is enabled, data to subaddress 1e must be transferred in the correct sequence. "0" = normal mode "1" = wrap around mode mcair (input with pull down resistor) this signal sets the unit to respond with a status word within 4s (dead bus time). subaddress 1f is also enabled to be a valid subaddress for data. normally subaddress 00 and 1f are reserved for mode codes. "1" = 4s dead bus response time, subaddress 1f used for data. "0" = 12s response time, subaddress 1f used for mode codes. c16mhz (input with pull up resistor) free running 16 mh z clock input. subsystem interface t0-t15 (bidirectional io) 16 bit bidirectional highway to transfer all information to / from subsystem. the user can also utilize this bus to monitor command word and header word (1760 requirement) for message illegalization.
scdct2578 rev c 3 nres (bidirectional io with pull up resistor) bidirectional reset pin. interface to this pin should be in the form of an open collector pull down driver. the unit will be reset when a low level input is asserted on power up. the pin is bidirectional in that the unit will drive the signal out low after the status response of the mode code reset remote terminal. upon reset the unit will be able to respond immediately after the rising edge of nres. nillcmd (input with pull up resistor) input to illegalize a command to the remote terminal with a clear status response. the signal is sampled after nvcr except non mode code receive commands in which case it is sampled after the last data word has been received. a low on this input will illegalize the message, no transfers to / from the subsystem will take place. the device will respond with a clear status unless a bit has been specifically set. no data will be transmitted following status. nvcr (output) early indication that the remote terminal has received a command and the command word is available on t0-t15. this can be used for message illegalization. ndata (output) access to valid data word in real time. data word available on t0-t15 during active low signal. ncmdstrb (output) this signal indicates that a completely validated message has been received for standard subaddress data activity. mode commands with or without data will not generate this signal. the ncmdstrb signal is 8.5s long and is an indication that a dma burst will initiate at the end of ncmdstrb to transfer words between the 32 word data memory and the subsystem. the command word is available on t0-t15 during this period. ndatast (output) signal to transfer normal validated received data from the data buffer memory to the subsystem at a rate of 500ns per word via the t0-t15 highway. nsstrb (input with pull up resistor) signal to transfer normal data for transmission from the subsystem to the data buffer memory at a maximum rate of 1s per word via the t0-t15 highway. c1mhz (output) free running 1 mhz clock to subsystem. nsstrb must be synchronized to this clock. nenvw (output) signal to transfer vector word from subsystem to unit in response to ?transmit vector word? mode command via the t0-t15 highway. nsync (output) signal to subsystem indicating receipt of a synchronize mode commands if the mode code has an associated data word, it will be available on t0-t15 at this time. if there is no associated data word, t0-t15 will be zero. discrete rt status inputs the following signals are inputs to set the appropriate bits in the remote terminals status word. all inputs are sampled after nvcr except non mode code receive commands in which case they are sampled after the last data word has been received. all status inputs are active low. nme (input with pull up resistor) message error, illegalizes message. no transfers to / from the subsystem will take place. no data will be transmitted following the status. nbusy (input with pull up resistor) subsystem busy. no data will be transferred to / from the subsystem and no data will be transmitted following status for non mode code transfers. ntf (input with pull up resistor) terminal flag. nsr (input with pull up resistor) service request. nssflag (input with pull up resistor) subsystem flag. 1760 signals nenchk (input with pull up resistor) enables / disables the internal hardware checksum generation and validation. when enabled, the circuitry will check all incoming data for correct checksum and generate the correct checksum word for an outgoing data transfer. "0" = enable checksum circuitry. "1" = disable checksum circuitry. status (open drain output) open drain output will toggle high or low on each incoming data word from the 1553 data bus provided nenchk is enabled. when the last data word is received the status line is sampled by the protocol circuitry to determine if the checksum for the message is valid. at the end of the message, if status is low then the checksum is not valid. this status signal can be wired to several different pins to customize the units response to a checksum failure. status can be wired to signals such as nillcmd and nsr which would cause the message to be illegalized and set service request bit in the status. nhdr (output) in mil-std-1760, the first data word of a message is defined as a header word. the nhdr signal indicates the presence of the header word on the t0-t15 highway as it is received. the header is also stored in the data buffer memory along with the complete message. strel (output) when the store is released from the aircraft all the remote terminal address inputs go high causing signal strel to go high.
scdct2578 rev c 4 message formats (rt) bc to rt transfer 1. valid command word received, contents av ailable on t0-t15 for illegalization purposes. 2. first valid data word (1760 header word) received, contents available on t0-t15 and stored in 32 word data memory. 3. second valid data word received, contents available on t0-t15 and stored in 32 word data memory. 4. last valid data word received, contents available on t0-t15 and stored in 32 word data memory. status bits must be valid with in 250ns. 5. status register contents tr ansferred to transmit buffer. 6. ncmdstrb indicates valid message received, command word av ailable on t0-t15 and stored in the 32 word command memory. 7. data words transferred from 32 word data memory to main memory at 500 ns per word. rt to bc transfer 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. status register contents tr ansferred to transmit buffer. 3. ncmdstrb indicates valid message received, command word av ailable on t0-t15 and stored in the 32 word command memory. 4. data words transferred from main memory to 32 word data memory at 1 s per word. rt to rt transfer (receiving terminal) status 123 4567 nvcr nhdr ndata ncmdstrb t0 - t15 data bus data data command data ndatast 1234 nvcr ncmdstrb t0 - t15 data bus data data status data command nsstrb tran cmd rec cmd nhdr ndata nvcr ncmdstrb data bus t0 - t15 5 6 7 12 34 8 data status status data ndatast
scdct2578 rev c 5 1. valid receive command word received, conten ts available on t0-t15 for illegalization purposes. 2. valid transmit command word received, contents available on t0-t15. 3. status response of transmitting terminal received. 4. first valid data word (1760 header word) received, contents available on t0-t15 and stored in 32 word data memory. 5. last valid data word received, contents available on t0-t15 and stored in 32 word data memory. status bits must be valid with in 250ns. 6. status register contents tr ansferred to transmit buffer. 7. ncmdstrb indicates valid message received, command word av ailable on t0-t15 and stored in the 32 word command memory. 8. data words transferred from 32 word data memory to main memory at 500 ns per word. mode codes without data 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. status register contents tr ansferred to transmit buffer. 3. synchronize mode command, t0-t15 = 0. mode codes with data receive 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. valid data word received, contents available on t0-t15. synchronize data word stored in 32 word data memory. 3. status register contents transferred to transmit buffer after message validation. 4. synchronize data word(when applicable) transferred from 32 word data memory to main memory and available on t0-t15. mode codes with data transmit 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. status register contents transferred to transmit buffer after message validation. 3. vector word or bit word (when applicable) transferred from main memory to transmit buffer. command status 12 3 data bus nvcr nres/nsync when applicable t0 - t15 data command status 1 2 3 4 data bus nvcr nsync when applicable t0 - t15 ndata 123 t0 - t15 data status command nvcr data bus nenvw when applicable
scdct2578 rev c 6 bc to rt transfer broadcast 1. valid command word received, contents av ailable on t0-t15 for illegalization purposes. 2. first valid data word (1760 header word) received, contents available on t0-t15 and stored in 32 word data memory. 3. second valid data word received, contents available on t0-t15 and stored in 32 word data memory. 4. last valid data word received, contents available on t0-t15 and stored in 32 word data memory. status bits must be valid with in 250ns. 5. ncmdstrb indicates valid message received, command word av ailable on t0-t15 and stored in the 32 word command memory. 6. data words transferred from 32 word data memory to main memory at 500 ns per word. rt to rt transfer broadcast (receiving terminal) 1. valid receive command word received, contents available on t0-t15 for illegalization purposes. 2. valid transmit command word received, contents available on t0-t15. 3. status response of transmitting terminal received. 4. first valid data word (1760 header word) received, contents available on t0-t15 and stored in 32 word data memory. 5. last valid data word received, contents available on t0-t15 and stored in 32 word data memory. status bits must be valid with in 250ns. 6. ncmdstrb indicates valid message received, command word av ailable on t0-t15 and stored in the 32 word command memory. 7. data words transferred from 32 word data memory to main memory at 500 ns per word. mode codes without data broadcast 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. synchronize mode command, t0-t15 = 0. 123 456 nvcr nhdr ndata ncmdstrb t0 - t15 data bus data data command data ndatast tran cmd rec cmd nhdr ndata nvcr ncmdstrb data bus t0 - t15 6 12 34 7 data status data 5 ndatast command 12 data bus nvcr nres/nsync when applicable t0 - t15
scdct2578 rev c 7 remote terminal detail command register the five most significant bits of the command register contain the remote terminal address. bit 10 of the register is the transmit / receive bit. if it is set to '1' the device will perform the transmit sequence and it is set to '0' it will perform the receive sequence. bits 5 to 9 contain the subsystem address but two of these addresses are reserved and one programable. 11111 (1f) or 00000 (00) indicate that the command is a mode code. the least significant five bits of the command register are used to decode the mode code and are not used as the word counter as a mode code may only have a maximum of one associated word. 111110 (1e) and wrapen sets the sequencer up to perform the wrap around function. the least significant five bits of the command register contain the number of data words to be transmitted or received. 11111 is 31 words and 00000 is 32 words. status register me message error: set internally as a result of an error in the received message or set externally with a discrete pin to illegalise a message. inst instrumentation: set to zero. sr service request: set with a discrete pin or by writing to address 0 00 08. resvd reserved: set to zero bcst broadcast command received: set internally. busy subsystem busy: set with a discrete pin or by writing to address 0 00 04. ssfl subsystem flag: set with a discrete pin or by writing to address 0 00 02. dbca dynamic bus control acceptance: set with a discrete pin or by writing to address 0 00 01. tf terminal flag: set with a discrete pin. the status register is cleared and the external bits loaded on all commands except 'transmit status' and 'transmit last command'. the external status bits (both discrete and programable) must be valid 600 ns from the rising edge of nvcr for transmit commands and mode codes, and 250 ns from the rising edge of ndata for the last data word in a receive message. if discrete status inputs are not used they may be left open circuit. status response time the response time (all commands) measured from the mid bit zero crossing of the last bit of the last word to the mid bit zero crossing of the status word sync is nominally 11.0 s. this time period is used to monitor for more data words on the bus. if a valid sync field followed by four valid manchester bi-phase bits are detected then this is considered to be another word on the bus. the response time may be reduced to 6.0 s (4.0 s dead bus time) by setting the mcair input active high. message illegalization any command or mode command may be illegalised by setting the nme input active low. the remote terminal will respond with status with the message error bit set, provided the message was valid, and not use the information received. there will be no transfers to or from the subsysyem. 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 rt address t r subsystem addr / mode word count / modecode 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 rt address m e in st s r resvd bc st bu sy ss fl db ca t f mode codes with data receive broadcast 1. valid command word received, contents available on t0-t15 fo r illegalization purposes. status must be valid within 600 ns. 2. valid data word received, contents available on t0-t15. synchronize data word stored in 32 word data memory. 3. synchronize data word (when applicable) transferred from 32 word data memory to main memory and available on t0-t15. data command 1 2 3 data bus nvcr nsync whenapplicable t0 - t15 ndata
scdct2578 rev c 8 one way to implement this function is to place a latching prom to the t0-t10 data bus. the prom would only have to decode 11 bits (5 bits subaddress, 5 bit word count and 1 bit t/r) and have a one bit output to place a high / low level on the nme input pin. the upper five bits (t11-t15) are just the remote terminal address for the unit which is constant so no decode of these bits is necessary. the latching signal for the prom would be the nvcr line. the nme signal will remain latched and stable until the next rising edge of nvcr. reserved mode commands are automatically declared illegal by the device and need not be included in the prom decode. all other conditions which require the message error bit to be set are automatic. 1760 checksum the 1760 checksum logic is enabled by setting the input nenchk active low. for transmit messages the checksum word is generated and inserted in the last word position of the transmitted message. for received messages the last data word receive (the checksum word) is validated. if this word meets the required criteria the output status remains low. this signal will toggle up and down for each data word received as it is calculating the checksum. the open drain output (status) signal may be hard wired to any of the discrete status inputs to set the required bit of the status response in the current message. in addition it may be hard wired to the input nillcmd which will prevent the message being written to memory (e.g. if it is required to set the service request bit and not use the data for a failed checksum - hard wire status to nsr and nillcmd). 1760 header word in 1760 applications the first data word received is designated the header word. an output nhdr is provided to indicate the presence of this word on the highway t0-t15 for verification purposes. a failed header word may be treated in the same way as a failed checksum. store released the signal strel is provided in 1760 applications to indicate to the subsystem that the store is no longer connected to the aircraft. initialization of the device the device must be reset to a known state on power up. (the rt address will be latched on power up). it will remain inactive until a valid command word is received. if the device is in the process of sequencing a command and a new command is received on the alternative bus, the sequence will be terminated and the device will sequence the new command. the device will only consider a command word valid if the following conditions are met: a) it contains the correct sync field. b) correct manchester bi-phase (16 bits plus parity). c) correct parity (odd). d) correct terminal address or broadcast address. e) does not follow contiguously a valid word on the same bus. the device will only consider a data word valid if the following conditions are met: a) it contains the correct sync field. b) correct manchester bi-phase (16 bits plus parity). c) correct parity (odd). d) follows contiguously a valid word on the same bus. upon receipt of a valid command word the signal nvcr becomes active low for 500 ns. (the command word is available on t0-t15 during this period for message illegalization). on all commands except 'wrap around transmit' the 32 data word memory is cleared. rt to bc transfer if a valid command is received to transmit up to 32 data words the device will initially respond with status. the signal ncmdstrb goes low for 8.5s synchronized to the 1 mhz clock indicating that a completely validated message has been received. the transmit command word appears on t0-t15 at this time. if the busy bit of the status is set the sequence will terminate after ncmdstrb. the end of the ncmdstrb will initiate the dma cycle to transfer the data words from the subsystem to the data buffer memory in a single burst. the subsystem enables the first data word onto t0-t15 and applies a nsstrb to the device synchronized to the 1 mhz clock, this data is stored in the data buffer memory. the subsystem must continue transferring the correct amount of words to the device in this manner at a rate of between 62.5 khz and 1 mhz. data is transferred from the data buffer memory to the output buffer for transmission as required by the 1553 data bus. if the 1760 checksum is enabled, the checksum word will be automatically generated and transmitted as the last data word. for example, if a command is received to transmit five data words the subsystem can load four or five data words. if the subsystem loads four data words the device will generate the last data word for transmission. if the subsystem loads five data words the device will ignore the last data word and transmit the internally generated checksum word instead. tx cmd ? status data data data
scdct2578 rev c 9 bc to rt transfer i if a valid command is received to receive up to 32 data words and the second word is another command word then an rt to rt transfer has been set up (see rt to rt transfer). all valid data words received are stored in the data buffer memory until message validation is complete after which the device will respond with status. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. data words are also available on t0-t15 as they are received indicated by signal ndata. only after the message has been completely validated will the data be transferred to the subsystem in a single burst at 500ns per word. this ensures that only complete validated messages are transferred to the subsystem. when a complete validated message is stored in the data buffer memory the signal ncmdstrb goes low for 8.5s synchronized to the 1 mhz clock indicating that a completely validated message has been received. the receive command word appears on t0-t15 at this time. if the busy bit of the status is set the sequence will terminate after ncmdstrb. the end of the ncmdstrb will initiate the dma cycle to transfer the data words from the data buffer memory to the subsystem. the first word received is enabled onto t0-t15 and the signal ndatast is pulsed low. this sequence is repeated for each data word that was received. rt to rt transfer to initiate an rt to rt transfer the bus controller will send a receive command to rta followed contiguously by a transmit command to rtb. rtb will respond with status and contiguous data (see rt to bc transfer). rta (the receiving terminal) will receive the status and data transmitted by rtb and store the received data in the data buffer memory until the entire rt to rt transfer has been validated, after which it will respond with its own status provided it was not a broadcast command, in which case the status transmission will be suppressed and the broadcast bit set. it will then transfer the data to ram (see bc to rt transfer). the error detection for the transmitting terminal will be the same as for rt to bc transfer. the error detection for the receiving terminal is as follows: error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. broadcast address. no status response. set message error. set broadcast. sequence terminated. 4. too few nsstrb from subsystem. message truncated. 5. too many nsstrb from subsystem. bit 1 of bit register set. too many data words will not be transmitted. rx cmd data data data ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. invalid data word. no status response. set message error. sequence terminated. 3. non contiguous data. no status response. set message error. sequence terminated. 4. too few data words. no status response. set message error. sequence terminated. 5. too many data words. no status response. set message error. set broadcast. sequence terminated. rx cmd tx cmd ? status data ? status
scdct2578 rev c 10 wrap around the wrap around capability is for test purposes only. it will test for transfers to and from the bus controller without any sub system intervention. the wrap around sequence will commence on receipt of a valid receive command word containing the wrap around subaddress (1e) providing the wrapen input is set high. the data received is stored in the data buffer memory and the device will respond with status. the bus controller will then send a transmit command to subaddress 1e and the data contained in the memory will be transmitted following the status. for the test to operate correctly the number of data words to be transmitted must be the same as the number received. dynamic bus control (00) the device will respond with status. if the terminal wishes to take over control of the bus, it must set the dynamic bus control acceptance bit of the status. error conditions action taken by device 1. invalid command. no response. command ignored. 2. non contiguous command words. no status response. set message error. sequence terminated. 3. transmit command followed by another word (excluding command word for rta, in which case it will respond to the latest command). no status response. set message error. sequence terminated. 4. transmitting terminal does not respond with status within 16 s. no status response. set message error. sequence terminated. 5. incorrect terminal transmitting. no status response. set message error. sequence terminated. 6. non contiguous data following status from rtb. no status response. set message error. sequence terminated. 7. invalid data transmitted from rtb. no status response. set message error. sequence terminated. 8. too few or too many data words. no status response. set message error. sequence terminated. rx cmd data data data ? status tx cmd ? status data data data error conditions action taken by device receive 1. invalid command. no response. command ignored. 2. invalid data word. no status response. set message error. sequence terminated. 3. non contiguous data. no status response. set message error. sequence terminated. 4. too few or too many data words. no status response. set message error. sequence terminated transmit 5. invalid transmit command. no response. command ignored. 6. transmit command followed by another word. no status response. set message error. sequence terminated 7. transmit broadcast address. no status response. set message error. set broadcast. sequence terminated. 8. transmit word count not equal to receive word count. no data transmission. set message error. sequence terminated. dbc cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. broadcast address. no status response. set message error. set broadcast. sequence terminated. 5. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated.
scdct2578 rev c 11 synchronize without data word (01) the device will respond with status. the nsync signal will go active low for 500 ns. throughout this period the highway t0-t15 will be zero and remain at zero until the next command is received. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. transmit status (02) the status register is not cleared or loaded before it is transmitted, i.e. it contains the resulting status from the previous command. initiate self test (03) the device will respond with status. it is at the discretion of the subsystem whether or not to carry out a self test. a subsystem driven self test is contained within the unit. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. transmitter shutdown (04) the device will respond with status and shutdown the transmitter on the alternate bus, thus inhibiting any further transmission on that bus. once a transmitter has been shutdown it can only be reactivated by the mode commands 'override transmitter shutdown' or 'reset remote terminal'. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. sync cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. tx st cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. broadcast address. no status response. set message error. set broadcast. sequence terminated. 5. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. i.s.t. cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. tx dis cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated.
scdct2578 rev c 12 override transmitter shutdown (05) the device will respond with status and reactivate a shutdown transmitter on the alternate bus. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. inhibit terminal flag (06) the device will respond with status and then inhibit any further setting of the terminal flag bit of the status. once the terminal flag bit has been inhibited it can only be reactivated by the mode commands 'override inhibit terminal flag' or 'reset remote terminal'. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. override inhibit terminal flag (07) the device will respond with status and then reactivate the terminal flag bit of the status register. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. . reset remote terminal (08) the device will respond with status after which the bidirectional signal nres to the subsystem will go active low for 500 ns. transmitter shutdown mode commands and inhibit terminal flag mode command will be reactivated. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. tx en cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. inh tf cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. en tf cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. reset cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated.
scdct2578 rev c 13 reserved mode codes (09-0f) the status is not cleared or loaded before it is transmitted with the message error bit set. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. transmit vector word (10) on receipt of a valid command to transmit the vector word the device will initially respond with status. after the status response has been initiated the vector word will be enabled onto t0-t15 from the subsystem with signal nenvw and transferred to the output buffer ready for transmission onto the 1553 data bus following the status. synchronize with data word (11) the synchronize data word received is stored in the data buffer memory until message validation is complete after which the device will respond with status. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. after the status response has been initiated the synchronize word will be transferred to the subsystem. the nsync signal will go active low for 500ns during which time t0-t15 will be set to the data word received. transmit last command (12) the status response contains the resulting status from the previous command. the data word transmitted following the status word contains the previous valid command (provided it was not transmit last command). resvd cmd ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. tx vw cmd ? status vw error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. broadcast address. no status response. set message error. set broadcast. sequence terminated. 5. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. sync cmd data ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command not followed contiguously by data word no status response. set message error. sequence terminated. 3. command followed by too many words. no status response. set message error. sequence terminated 4. t/r bit of command set to one. no status response. set message error. sequence terminated. 5. t/r bit of command set to one and broadcast address no status response. set message error. set broadcast. sequence terminated. tx lst cmd ? status lst cmd
scdct2578 rev c 14 transmit bit word (13) on receipt of a valid command to transmit the bit word the device will respond with status followed by the bit word, after which the bit register is cleared. bits 2 to 15 are always zero. bit 1 is set if the subsystem sends too many nsstrb?s. selected transmitter shutdown (14) this mode command is not normally used in dual redundant systems. the device will respond with status and shut down the transmitter on the bus designated by the two least significant bits of the data word. the bus addresses of the device are channel 0 - 00, channel 1- 01. if the command is received on the same bus as the designated shut down bus then the device will respond with status and no shut down will occur. once a transmitter has been shut down it can only be reactivated by an 'override shutdown command' or 'reset remote terminal'. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. override sel transmitter shut- down(15) this mode command is not normally used in dual redundant systems. the device will respond with status and reactivate a shutdown transmitter on the bus designated by the two least significant bits of the data word. the bus addresses of the device are channel 0 - 00, channel 1 - 01. if the command is received on the same bus as the designated override shutdown bus then the device will respond with status and no reactivation will occur. if the command was a broadcast the status transmission will be error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. broadcast address. no status response. set message error. set broadcast. sequence terminated. 5. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. tx bit cmd ? status bit word error conditions action taken by device 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. 3. t/r bit of command set to zero. no status response. set message error. sequence terminated 4. broadcast address. no status response. set message error. set broadcast. sequence terminated. 5. t/r bit of command set to zero and broadcast address no status response. set message error. set broadcast. sequence terminated. tx dis cmd data ? status error conditions action taken by device 1. invalid command. no response. command ignored. 2. command not followed contiguously by data word no status response. set message error. sequence terminated. 3. command followed by too many words. no status response. set message error. sequence terminated 4. t/r bit of command set to one. no status response. set message error. sequence terminated. 5. t/r bit of command set to one and broadcast address no status response. set message error. set broadcast. sequence terminated. tx en cmd data ? status
scdct2578 rev c 15 suppressed and the broadcast bit in the status register set. reserved mode codes (16-1f) the status is not cleared or loaded before it is transmitted with the message error bit set. if the command was a broadcast the status transmission will be suppressed and the broadcast bit in the status register set. detailed timing min max unit 1. nvcr pulse duration 500 650 ns 2. nvcr to t0-t15 valid 250 ns 3. nvcr to t0-t15 invalid 250 ns 4. nvcr to discrete status inputs (not rec) 600 ns 5. ndata & nhdr pulse duration 475 525 ns 6. t0-t15 valid to ndata & nhdr 250 ns 7. ndata & nhdr to t0-t15 invalid 250 ns 8. last ndata to discrete status inputs (rec) 250 ns min max unit 1. c1mhz to ncmdstrb 75 ns 2. ncmdstrb duration 8475 8525 ns 3. t0-t15 valid to ncmdstrb 100 ns 4. ncmdstrbto t0-t15 invalid 100 ns error conditions action taken by device 1. invalid command. no response. command ignored. 2. command not followed contiguously by data word no status response. set message error. sequence terminated. 3. command followed by too many words. no status response. set message error. sequence terminated 4. t/r bit of command set to one. no status response. set message error. sequence terminated. 5. t/r bit of command set to one and broadcast address no status response. set message error. set broadcast. sequence terminated. resvd t/r=1 ? status resvd t/r=0 data ? status error conditions action taken by device t/r =1 1. invalid command. no response. command ignored. 2. command followed by another word. no status response. set message error. sequence terminated. t/r = 0 3. invalid command. no response. command ignored. 4. command not followed contiguously by data word. no status response. set message error. sequence terminated. 5. command followed by too many data words. no status response. set message error. sequence terminated. 1 2 8 4 3 nvcr t0 - t15 status ndata nhdr t0 - t15 status 7 5 6 t0 - t15 ncmdstrb c1mhz 2 1 3 4 1 t0 - t15 c1mhz 3 1 5 2 4 6 ncmdstrb nsstrb
scdct2578 rev c 16 min max unit 1. rising edge of ncmdstrb to falling0.5 10.0 s edge of first nsstrb 2. nsstrb to next nsstrb 1.0 16.0 s 3. rising edge of c1mhz to falling edge 75 ns of nsstrb 4. falling edge of c1mhz to rising edge 75 ns of nsstrb 5. falling edge of nsstrb to data enabled 75 ns onto t0-t15 from subsystem 6. rising edge of nsstrb to data disabled 75 ns onto t0-t15 from subsystem min max unit 1. rising edge of ncmdstrb to 225 275 ns falling edge of first ndatast 2. ndatast to next ndatast 475 525 ns 3. ndatast pulse duration 225 275 ns 4. data valid on t0-t15 to ndatast 100 ns 5. ndatast to data invalid on t0-t15 100 ns min max unit 1. nres/nsync pulse duration 475 525 ns 2. t0-t15 valid to nsync 50 ns 3. nsync to t0-t15 invalid 250 ns 4. nvcr to nres/nsync non bcast 27.9 28.1 s nvcr to nres/nsync bcast 8.9 9.1 s 5. nenvw to t0-t15 valid 250 ns 6. nenvw to t0-t15 invalid 500 ns 7. nenvw is reset by nvcr 16 mhz clock requirement min max t 40% 60% of cycle transformers the device requires a 1:2.5 turns ratio for direct coupling and 1:1.79 turns ratio for transformer coupling. the center tap of the transformers must be tied to ground. the suggested transformer is: technitrol 1553-45 t0 - t15 c1mhz 1 5 ncmdstrb 3 2 4 ndatast nres/nsync t0 - t15 t0 - t15 nenvw 1 2 3 5 6 tt t t 2.4v 0.4v data ndata 1:1.79 1:1.4 0.75zo p' p 0.75zo 0.75zo 0.75zo a' a 1:2.5 zo direct coupled transformer coupled data ndata zo
scdct2578 rev c 17 operating conditions absolute maximum ratings v dd supply voltage +7 volts v ss supply voltage 0 volts v ih high level input voltage v dd +0.5 volts v il low level input voltage v ss -0.5 volts operating free air temperature range -55 to +125 c storage temperature range -65 to +150 c recommended operating conditions min nom max unit v dd supply voltage 4.75 5.0 5.5 volts free air temperature range -55 +125 c electrical characteristics digital signals min nom max unit a1. input with pull up v ih high level input voltage 2.4 oc volts v il low level input voltage v ss 0.8 volts i ih high level input current 10 a i il low level input current 35 65 120 a c in input capacitance 10 pf a2. input with pull up v ih high level input voltage 2.4 oc volts v il low level input voltage v ss 0.8 volts i ih high level input current 10 a i il low level input current 450 800 1500 a c in input capacitance 10 pf b. input with pull down v ih high level input voltage 2.4 v dd vo l t s v il low level input voltage oc 0.8 volts i ih high level input current 35 65 120 a i il low level input current 10 a c in input capacitance 10 pf c. output v oh high level output voltage v dd -0.5 v dd vo l t s v ol low level output voltage 0.4 volts i oh high level output current 2.0 5.5 10.0 ma i ol low level output current 2.0 5.5 10.0 ma d. open drain output v oh high level output voltage oc volts v ol low level output voltage 0.4 volts i oh high level output current 10 a i ol low level output current 2.0 5.5 10.0 ma min nom max unit e. not used f. input output v ih high level input voltage 2.4 v dd volts v il low level input voltage v ss 0.8 volts i ih high level input current 10 a i il low level input current 10 a c in input capacitance 10 pf v oh high level output voltage v dd -0.5 v dd volts v ol low level output voltage 0.4 volts i oh high level output current 2.0 5.5 10.0 ma i ol low level output current 2.0 5.5 10.0 ma i hz high impedance io current 10 a g. input output with pull up v ih high level input voltage oc oc volts v il low level input voltage v ss 0.8 volts i ih high level input current 10 a i il low level input current 450 800 1500 a c in input capacitance 10 pf v oh high level output voltage v dd -0.5 v dd volts v ol low level output voltage 0.4 volts i oh high level output current 0.5 1.0 1.8 ma i ol low level output current 1.5 5.0 9.0 ma data bus signals h. transmitter i o driver peak output current 600 ma v o differential output level 7.0 7.5 9.0 v p - p point a-a' (r l =35 ohms) on 1760 bus t rf rise and fall times 100 200 300 ns (10%-90% of p-p output) v oe output offset 2.5s after -90 90 mv mid bit crossing of parity, point a-a' (r l =35 ohms) v o differential output level 6.0 7.5 9.0 v p - p point a-a' (r l =35 ohms) on 1553 bus h. receiver v idr differential input level 14 20 v p - p point p-p? (txfmr-2.12:1) c mrr common mode rejection 45 db ratio v th input threshold voltage 0.60 0.82 1.20 v p - p referred to the bus (100khz-1mhz)
scdct2578 rev c 18 pin assignments - pga package 2578/81-02-xx-yy-p119 pin no signal io type pin no signal io type g12 strel (-12 only) c n1 addr d a1 f12 nsr a2 m3 addr c a1 e12 wrapen b l4 addr b a1 e11 t 0 f n3 addr a a1 c12 t 1 f n4 addr p a1 d11 t 2 f n5 databus 0 h a13 t 3 f l6 ndatabus 0 h b11 t 4 f l7 vdd c10 t 5 f m7 vss a11 t 6 f n9 c16mhz a2 a10 t 7 f n10 ndata c a9 databus 1 h m11 nres g c8 ndatabus 1 h l10 nsstrb a1 c7 vdd m12 c1mhz c b7 vss l11 ncmdstrb c c6 nillcmd a2 k11 ndatast c a4 t 8 f k12 nenvw c a3 t 9 f j12 nssflag a2 c4 t 10 f h11 nbusy a2 a2 t 11 f g13 nhdr (-12 only) c b2 t 12 f m9 la (-12 only) a1 d3 t 13 f g1 nvalchk (-12 only) c c1 t 14 f f2 n/c e3 t 15 f m5 n/c e1 nsync c n8 n/c f1 mcair b h12 n/c g3 status (-12 only) db9n/c h2 nenchk (-12 only) a1 a6 n/c j2 nvcr c a5 n/c j3 ntf a2 b5 n/c l2 nme a2 b4 n/c k3 addr e a1 b3 n/c
scdct2578 rev c 19 pin assignments - flat package 2578/81-02-xx-yy-f84 # signal io type # signal io type 1 t12 f 43 c1mhz c 2t13 f 44ncmdstrb c 3 t14 f 45 ndatast c 4 t15 f 46 nenvw c 5 nsync c 47 nssflag a2 6 mcair b 48 nbusy a2 7 nvalchk (-12 only) c 49 n/c 8 status (-12 only) d 50 nhdr (-12 only) c 9n/c 51n/c 10 n/c 52 strel (-12 only) c 11 nenchk (-12 only) a1 53 nsr a2 12 nvcr c 54 n/c 13 bcst c 55 n/c 14 ntf a2 56 wrapen b 15 n/c 57 n/c 16 n/c 58 t0 f 17 nme a2 59 n/c 18 addre a1 60 n/c 19 n/c 61 t1 f 20 n/c 62 t2 f 21 addrd a1 63 n/c 22 addrc a1 64 n/c 23 addrb a1 65 n/c 24 n/c 66 t3 f 25 addra a1 67 t4 f 26 n/c 68 t5 f 27 n/c 69 n/c 28 addrp a1 70 t6 f 29 data 0 (bus) h 71 n/c 30 ndata 0 (bus) h 72 n/c 31 n/c 73 t7 f 32 n/c 74 data 1 (bus) h 33 n/c 75 ndata 1 (bus) h 34 vdd 76 n/c 35 vss 77 n/c 36 c16mhz a2 78 vdd 37 la (-12 only) a1 79 vss 38 ndata c 80 nillcmd a2 39 n/c 81 t8 f 40 n/c 82 t9 f 41 nres g 83 t10 f 42 nsstrb a1 84 t11 f
scdct2578 rev c 20 power supply requirements current max unit transmitter standby (both channels) 60 ma 25% duty cycle (one channel) 220 ma 50% duty cycle (one channel) 350 ma power dissipation max unit transmitter standby (both channels) 0.3 watts 50% duty cycle (one channel) 0.6 watts 100% duty cycle (one channel) 0.9 watts power supply decoupling to maximize stabilization of the devices transceivers, a 4.7f and a 0.1f capacitor should be connected in parallel from the +5v supply to ground. application note circuit to transfer data from subystem data to be transferred from subsystem vector word from subsystem from subsystem strobe control 1mhz nsstrb t0-t15 ct2578/81 nenvw .050 typ 63 64 84 1 43 42 21 22 .017 .002 .140 max (3 places) corner .040 (1 places) corner .020 signifies lead 1 top view 1.165 max 1.000 .010 .008 .002 .095 .010 package outline flat package ? 84 leads cqfp
scdct2578 rev c 1.335 max 1.200 1.335 max typ .100 n m l k j h g f e d c b a 12345678910111213 bottom view .020 .050 .190 .060 .040 .170 .150 max .016 .040 ref 45 chamfer typ .100 .012 1.200 .012 side view top view package outline plug in package ? 119 pins pga
22 plainview, new york toll free: 800-the-1553 fax: 516-694-6715 se and mid-atlantic tel: 321-951-4164 fax: 321-951-4254 international tel: 805-778-9229 fax: 805-778-1980 west coast tel: 949-362-2260 fax: 949-362-2266 northeast tel: 603-888-3975 fax: 603-888-4585 central tel: 719-594-8017 fax: 719-594-8468 www.aeroflex.com info-ams@aeroflex.com our passion for performance is defined by three attributes represented by these three icons: solution-minded, performance-driven and customer-focused aeroflex microelectronic solutions reserves the right to change at any time without notice the specifications, design, function, or form of its products described herein. all parameters must be validated for each customer's application by engineering. no liability is assumed as a result of use of this product. no patent licenses are implied. scdct2578 rev c ordering information model number * mil-std-1760 pinout mcair compliant desc part number package ct2578-02-qm-p119 tbd 119 pin pga ct2578-02-xt-p119 ct2578-02-in-p119 ct2578-02-cg-p119 ct2578-12-qm-p119 ? ct2578-12-xt-p119 ? CT2578-12-IN-P119 ? ct2578-12-cg-p119 ? ct2578-02-qm-f84 84 lead cqfp ct2578-02-xt-f84 ct2578-02-in-f84 ct2578-02-cg-f84 ct2578-12-qm-f84 ? ct2578-12-xt-f84 ? ct2578-12-in-f84 ? ct2578-12-cg-f84 ? ct2581-02-qm-p119 ? 119 pin pga ct2581-02-xt-p119 ? ct2581-02-in-p119 ? ct2581-02-cg-p119 ? ct2581-02-qm-f84 ? 84 lead cqfp ct2581-02-xt-f84 ? ct2581-02-in-f84 ? ct2581-02-cg-f84 ? * screening code breakdown qm = mil-std-883 compliant xt = extended temperature range (-55c to +125c) in = industrial temperature range (-40c to +85c) cg = commercial temperature range (-0c to +70c)

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