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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
PM7322
RCMP-800 DATA SHEET ERRATA
ERRATA
ISSUE 11: FEBRUARY 2002
Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers' Internal Use
105 - 8555 Baxter Place Burnaby, BC Canada V5A 4V7 604 .415.6000
PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
CONTENTS
1 2 LEGEND.............................................................................................................................................................1 CHANGES TO DATASHEET ISSUE 6 ...........................................................................................................1 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 3 PG. 1............................................................................................................................................................1 PG. 2............................................................................................................................................................1 PG. 25..........................................................................................................................................................2 PG. 40..........................................................................................................................................................2 PG. 48..........................................................................................................................................................3 PG. 49..........................................................................................................................................................3 PG. 59..........................................................................................................................................................3 PG. 66..........................................................................................................................................................3 PG. 125........................................................................................................................................................4 PG. 126........................................................................................................................................................5 PG. 130........................................................................................................................................................5 PG. 138........................................................................................................................................................6 PG. 140........................................................................................................................................................7 PATENT INFORMATION .............................................................................................................................7
ANOMALIES .....................................................................................................................................................9 3.1 3.2 DATA CORRUPTION IN THE FIRST WORD OF A CELL ..............................................................................9 OCA DEASSERTION ................................................................................................................................11
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
1
LEGEND 1. unaltered text is unchanged to add context to changes 2. new material is bold and Italicized 3. obsolete material is struck out 4. comments specific to this document are in italics 5. A vertical bar in left margin indicates that this is a new item which was not present in the previous issue of this document.
2
CHANGES TO DATASHEET ISSUE 6 The Congestion Control feature is removed. Hence Changes 2.1 to 2.3, 2.5 to 2.13.
2.1
Pg. 1 * Discards on command all low priority (high CLP bit) cells to relieve switch congestion.
2.2
Pg. 2 * Counts maintained for entire device include total cells input, total cells output, OAM cells, cells discarded due to congestion, corrupted OAM cells, and cells with unassigned/invalid VPI/VCIs.
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
2.3
Pg. 25
CONG
Input
123
VSS_DC21 Ground
The congestion indication (CONG) input signals that cell congestion is occurring in an element downstream of the RCMP-800 and that all low priority cells be dropped. If CONG is high, the RCMP-800 drops all cells with a one in the CLP bit position after policing has occurred, except AAL5 end-of-message (EOM) cells. (Dropping an EOM cell results in corrupting two packets; this does help to relieve the congestion.) CONG may be treated as an asynchronous input. This ground pin should be connected to GND in common with VSS_DC.
2.4
Pg. 40 Table 1 VC Table Record
SA[19:16] 0000 0001 0010 0011
LSB(0) Reserved for Search Table MSN (8) TUC (16) Reserved for Search Table (16) NNI (1) Search VPI (12) VCI (16) FieldB (11)
Status (4) Config (6) Extended Status (9) OAM Config (8)
MSB(39)
UDF (8)
BWD Routing Tag
(5)
The field widthes should be as follows: SA[19:16] 0000 0001 0010 0011 MSB(39) LSB(0) Reserved for Search Table MSN (8) TUC (16) Reserved for Search Table (16) NNI (1) Search VPI (12) VCI (16) FieldB (11)
Status Config (4) Extended Status (6) OAM Config (9)
UDF
(8)
BWD Routing Tag
(8) (5)
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
2.5
Pg. 48
AAL5 Packet Tagging and Dropping An AAL5 packet can be up to 1366 cells long. If a cell is dropped early in a packet due to policing or congestion, then the remaining cells of the packet represent wasted bandwidth. Optionally, all remaining cells of a packet can be dropped or tagged once a single cell has been dropped or tagged. 2.6 Pg. 49 * 2.7 number of CLP=1 cells dropped due to congestion
Pg. 59 Congestion Control Congestion control is handled by a single signal, CONG, entering the device. When this signal indicates that congestion is being experienced by the switch core, all low priority cells (high CLP bit) are discarded. This includes cells which are made low priority during the policing process.
2.8
Pg. 66 The "Count of Cells Dropped Due to Congestion" register is removed since the Congestion Control function is removed. 0x34 Count of Cells Dropped Due to Congestion Reserved
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
2.9
Pg. 125 Register 0x30: Counter Status Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Type Function Unused Unused Unused Unused Unused Unused Unused Unused Unused Unused DROPCH Reserved INVALCH OAMERRCH OAMCH XFER OVR Default X X X X X X X X X X X X X X X X
R R R R R R
This register contains status information indicating when counter data has been transferred into the holding registers and indicating whether the holding registers have been overrun. It also indicates if the any of the counts are non-zero.
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
DROPCH: The DROPCH bit is set to logic 1 if the Count of Cells Dropped Due to Congestion is a non-zero value. 2.10 Pg. 126
XFER: The XFER bit indicates that a transfer of counter data (i.e. data for one or more of the Dropped Cells Due to Congestion register, Invalid Cell Count register, Errored OAM Cell Count register and Valid OAM Cell Count register) has occurred. A logic 1 in this bit position indicates that a latch request, initiated by writing to one of the counter register locations, was received and a transfer of the counter values has occurred. A logic 0 indicates that no transfer has occurred. The XFER bit is cleared (acknowledged) by reading this register. The XFERI bit of the Master Interrupt Status #1 is set when the XFER bit is asserted. 2.11 Pg. 130
Register 0x34: Count of Cells Dropped Due to Congestion Bit Bit 15 Bit 14 Bit 13 Bit 12 Bit 11 Bit 10 Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Type R R R R R R R R R R R R R R R R Function DROP[15] DROP[14] DROP[13] DROP[12] DROP[11] DROP[10] DROP[9] DROP[8] DROP[7] DROP[6] DROP[5] DROP[4] DROP[3] DROP[2] DROP[1] DROP[0] Default X X X X X X X X X X X X X X X X
DROP[15:0]: The DROP[15:0] bits represent the number of cells that have been discarded due to an assertion of the CONG input since the last time the count was transferred. The count is transferred by writing to either address 0x00, 0x31,
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
0x32, 0x33 or 0x34. Such a write transfers the internally accumulated dropped cell count to this register within three SYSCLK cycles and simultaneously resets the internal counter to begin a new cycle of error accumulation. This transfer and reset is carried out in a manner that ensures that coincident events are not lost. 2.12 Pg. 138 The CONG pin is removed from the following list for test mode 0.
0x41
D[15] D[14] D[13] D[12] D[11] D[10] D[9] D[8] D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] ONESEC TCK TRSTB TMS TDI
0x48
IDAT[15]1 IDAT[14]1 IDAT[13]1 IDAT[12]1 IDAT[11]1 IDAT[10]1
0x4A
0x5C
0x62
SD[15] SD[14]
0x63
SD[31] SD[30] SD[29] SD[28] SD[27] SD[26] SD[25] SD[24] SD[23] SD[22] SD[21] SD[20] SD[19] SD[18] SD[17] SD[16]
0x64
0x7A
0x7B
IPOLL IBUS8 ISOC1 CONG
SD[13] SD[12] SD[11] SD[10] SD[9] SD[8] SD[7] SD[6] SD[5] SD[4] SD[3] SD[2] SD[1] SD[0]
SP[4] SP[3] SP[2] SP[1] SP[0] SD[39] SD[38] SD[37] SD[36] SD[35] SD[34] SD[33] SD[32] ORDENB OBUS8
IDAT[9]1 IPRTY[1]1 IDAT[8]1 IPRTY[0]1 IDAT[7]1 IDAT[6]1 IDAT[5]1 IDAT[4]1 IDAT[3]1 IDAT[2]1 IDAT[1]1 IDAT[0]1 ICA[4]1 ICA[3]1 ICA[2]1 ICA[1]1
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
2.13
Pg. 140 The CONG pin is changed to an Internal Delay element in the Boundary SCAN chain. The logic value to be expected in the chain location is indicated in parenthesis. Boundary Scan Register Bit
91 90:75 74:73 72 71 70 69
Pin/Enable
SYSCLK IDAT[15:0] IPRTY[1:0] ISOC IFCLK IAVALID_ICA[4] IADDR_OEB (for IAVALID_ICA[4] & IADDR_ICA[3:2]) IADDR_ICA[3:2] ICA[1] IADDR_IWRENB[4 :2] IWRENB[1] IPOLL IBUS8
Type
I I I I I I/O E
Pin/Enable
CSB WRB RDB RSTB INTB DREQ OTSEN
Type
I I I I O O I
Boundary Scan Register Bit
33 32 31 30 29 28 27
I/O I O O I I
68:67 66 65:63 62 61 60
OBUS8 ORDENB OCA OFCLK OSOC ODATOEB (for ODAT[15:0], OSOC and OPRTY[1:0] OPRTY[1:0] ODAT[15:0] BUSYB CONG Internal Delay (Expect Logic 0) HIZ*
I I O I O E
26 25 24 23 22 21
ONESEC D[15:0] DOEB (for D[15:0]) A[6:0]
I I/O E I
59 58:43 42 41:35
O O O I
20:19 18:3 2 1
ALE
I
34
E
0
2.14
Patent Information No patent information in the original data sheet. Note: The technology discussed is protected by one or more of the following Patents:
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
U.S. Patent No. 5,889,778 U.S. Patent No. 6,108,303 U.S. Patent No. 6,128,766 Canadian Patent No. 2,181,293 Canadian Patent No. 2,209,887 UK Patent No. 2,303,521 Japanese Patent No. 2,965,907 Relevant patent applications and other patents may also exist.
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
3 3.1
ANOMALIES Data corruption in the first word of a cell The RCMP can corrupt the first 16-bit word of an ATM cell under certain circumstances. This error occurs only when OAM cells are inserted in the cell slot immediately before the outgoing user cell (ie. there is no delay between the OAM cell and the user cell). Only the non-overwritten (ie. not translated or replaced with other fields) portion of the incoming header can get corrupted. Therefore, if OAM functions are not enabled, this problem does not exist. The corrupted word may be prepended or postpended information, or the first 16-bit word of the ATM cell header, depending on the cell length which is controlled by the output cell configuration programmed in the RCMP (register 0x38). The following describes the three cases that could occur: Case 1: Output cell has 27 words If the RCMP is configured to output only 27-word cells (i.e. 53-byte ATM cells in 16bit mode), then the following fields can get corrupted: 15 GFC[3:0] VPI[7:0] VCI[15:12] 0
If the RCMP is configured to overwrite part of the first header word, then only the non-overwritten portion of the header can get corrupted. For example, if the RCMP is configured to perform VP switching on a connection, the VPI field and the GFC field will be correct, but VCI[15:12] fields can get corrupted. Case 2: Output cell has prepend words If there are prepend (with or without postpend) words, then it is the first 16-bit word of prepend that can get corrupted, and the header bytes of the cell will not be affected. Note that corruption occurs only if the incoming prepend words are not overwritten. That is, if the GPREPO bit of RCMP register 0x18 is set to a logic 1, then the incoming prepended words will be replaced, and no corruption of that first word will occur. For the case where incoming cells have 27 words only, and prepend words are added to the output cell, then no corruption occurs, since the prepend words are considered to be "overwritten".
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
Case 3: Output cell has postpend words If there are only postpend words, then it is the first 16-bit word of postpend that can get corrupted, and the header bytes of the cell will not be affected. Note that corruption only occurs only if the incoming postpend words are not overwritten. That is, if the GPREPO bit of RCMP register 0x18 is set to a logic 1, then the incoming postpend words will be replaced, and no corruption of that first word will occur. For the case where incoming cells have 27 words only, and postpend words are added to the output cell, then no corruption occurs, since the postpend words are considered to be "overwritten". Work-Around 1) Do not use the 27-word mode (ie. RCMP outputing 27-word cells) or 2) If you do need to use the 27-word mode, do the following: * Configure the RCMP to output 28-word cells, with the extra word being a postpend word: * * Write 8043 to register 0x38 and then write 8042 to the same register. The "8043" is to reset the output FIFO first.
Set the OCALEVEL0 bit in register 0x38 to 0, to configure the OCA signal to deassert four words before the end of the cell
* This assumes that the device receiving cells from the RCMP uses the OSOC signal to indicate start-of-cell, and will start accepting the words of the cell aligned to the OSOC signal (words that may have arrived before the OSOC would be discarded). Mechanism of work-around: The first time when the RCMP outputs a 28-word cell, the receiving device will read the first 27 words, accepts the cell and then stop. At the same time, since the OCALEVEL0 bit is set to 0, the OCA signal will have deasserted when 27 words have been read. Now, when the RCMP has a new cell to output, it asserts OCA. This time, there is the last word of the previous cell (this word is simply garbage) still remaining in the FIFO. When the receiving device asserts the read enable (ORDENB), it reads this "garbage" word, and then it reads the first word of the new cell, and so on. However, the OSOC signal will only be asserted aligned to the first word of the new cell. Therefore, the receiving device will resync its counter and read in the 27 words of the new cells, and will discard the garbage cell. This then repeats for any new cells that are output by the RCMP.
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
This work-around has been tested in the lab, running full 622Mbps traffic. 3.2 OCA Deassertion There is an anomaly in the operation of OCA when the OCALEVEL0=0 mode is used (ie. the "early deassertion mode"). When a cell enters the FIFO at the same time the last word of a cell is read out, OCA is errorneously asserted and then deasserted on the next cycle. The problem does not exist if OCALEVEL0=1. Workaround: 1. Do not use the OCALEVEL0=0 mode. Almost all applications do not require this mode. This is because the "early deassertion mode" is only useful for an input interface, where the "CA" signal indicates that the FIFO is almost full, such that it cannot accept another cell. Now, if the source sending the cell to this input is heavily pipelined, then this "early deassertion" would be used to avoid queuing another cell to be sent. Since in the case of the RCMP, it is an output interface, this "early deassertion mode" is almost never used. 2. Sample OCA on two successive cycles before reading out a cell.
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
NOTES
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PM7322 RCMP-800
ERRATA PMC-1960412 ISSUE 11 RCMP-800 DATASHEET ERRATA
CONTACTING PMC-SIERRA, INC. PMC-Sierra, Inc. 105-8555 Baxter Place Burnaby, BC Canada V5A 4V7 Tel: Fax: (604) 415-6000 (604) 415-6200 document@pmc-sierra.com info@pmc-sierra.com apps@pmc-sierra.com http://www.pmc-sierra.com
Document Information: Corporate Information: Application Information: Web Site:
None of the information contained in this document constitutes an express or implied warranty by PMC-Sierra, Inc. as to the sufficiency, fitness or suitability for a particular purpose of any such information or the fitness, or suitability for a particular purpose, merchantability, performance, compatibility with other parts or systems, of any of the products of PMC-Sierra, Inc., or any portion thereof, referred to in this document. PMC-Sierra, Inc. expressly disclaims all representations and warranties of any kind regarding the contents or use of the information, including, but not limited to, express and implied warranties of accuracy, completeness, merchantability, fitness for a particular use, or non-infringement. In no event will PMC-Sierra, Inc. be liable for any direct, indirect, special, incidental or consequential damages, including, but not limited to, lost profits, lost business or lost data resulting from any use of or reliance upon the information, whether or not PMC-Sierra, Inc. has been advised of the possibility of such damage. (c) 2002 PMC-Sierra, Inc. PMC-1960412(R11) ref PMC-940904(R6) Issue date: February 2002
PMC-Sierra, Inc.
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