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Ordering number:ENN3215B
CMOS IC
LC8955
CD-I Format ADPCM Data Replay IC
Overview
The SANYO LC8955 is a stereo/mono replay IC for CD-I format ADPCM data. In addition to an ADPCM decoding circuit, the LC8955 also incorporates a DMA interface, buffer RAM interface and a D/A converter serial interface. The LC8955 interfaces directly with the SANYO LC8951 Real-time Error-correction and Host Interface Processor, allowing a CD-I replay system to be configured easily. The LC8955 is designed to operate with a host microprocessor which sets the operating mode. It operates from a single 5V supply, and is available in 80-pin plastic QIPs. TM Program transfer The CPU writes each byte of data directly into the LC8955 under program control. Data is transferred using the CPU data bus. DMA transfer Data is written into the LC8955 by an external DMA controller using the CPU data bus. Up to 64 ADPCM sound groups can be written to an external 8K byte buffer RAM. One sound group consists of 128 bytes of CD-I data. The LC8955 then decodes data in the buffer without intervention from the CPU or DMA controller, leaving these devices free for other tasks.
Features
* Real-time ADPCM decoder IC. * Direct interface to SANYO's LC8951 error-correction IC for high-speed data transfer. * Data transfer under program or DMA control. * Independent data and control busses in auto-request transfer. * 8K byte external static RAM interface. * Buffers up to 64 ADPCM sound groups in external RAM. * DAC interface circuit. * 80-pin plastic QIP.
Package Dimensions
unit:mm 3044B-QIP80A
[LC8955]
26.0 20.0 0.8 64 65 1.0 0.8 0.35 3.0 0.8 41 40 0.15 1.7 25 3.0 1.0 80 1 24 2.45max 2.15 1.7 1.7 16.6 22.6
20.0
14.0
The LC8955 is divided into three major functional blocks.
ADPCM Input Block
The ADPCM input block has three data input modes, selected by setting internal registers. Auto-request transfer Data is transferred automatically into the LC8955's data port without CPU intervention. A number of handshaking signals control data transfer. The input device can be an LC8951 Real-time Error-correction and Host Interface Processor or another CD-ROM output device.
0.8
Functional Description
0.35
SANYO : QIP80A
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
62501TN (KT)/8030JN, TA/3260YT/D119TA, TS (US) No.3215-1/4
LC8955 Decoder Block
The decoder block converts the ADPCM data into 16-bit linear PCM data. Decoding parameters can either be set by the CPU, or read from subheader information in the ADPCM data stream.
DAC Interface Block
Two output formats are available. The first is suitable for input to SANYO's LC7833, 7833M DA converters, and the second is the standard CD-I format. The output circuit will also accept CD-DA format input data and, by setting an LC8955 internal register, switch it through to the output pins without processing.
Specifications
Absolute Maximum Ratings at VSS = 0V
Parameter Maximum supply voltage Input/output voltage Allowable power dissipation Operating temperature Storage temperature Solder temperature Symbol VDD max VI, VO Pd max Topr Tstg 10s., dipping of pins only Ta=25C Ta=25C Ta70C Conditions Ratings - 0.3 to +7.0 - 0.3 to VDD +0.3 350 - 30 to +70 - 55 to +125 260 Unit V V mW
C C C
Allowable Operating Conditions at Ta = -30 to +70C, VSS = 0V
Parameter Supply voltage Input voltage range Symbol VDD VIN Conditions Ratings min 4.5 0 typ 5.0 max 5.5 VDD Unit V V
DC Characteristics at Ta = -30 to +70C, VSS = 0V, VDD = 4.5 to 5.5V
Parameter Input high-level voltage Input low-level voltage Input high-level voltage Input low-level voltage Output high-level voltage Output low-level voltage Input leakage current Pull-up resistor Symbol VIH1 VIL1 VIH2 VIL2 VOH VOL IL RUP Conditions All input pins except RESETB, EOPB, IO7 to 0, SD7 to 0 RESETB, EOPB, IO7 to 0, SD7 to 0 All output pins: IOH=- 3mA All output pins: IOL=3mA All input pins: VI=VSS, VDD IO0 to 7, SD0 to 7 - 25 10 20 Ratings min 2.2 0.8 2.5 0.6 2.4 0.4 +25 40 typ max Unit V V V V V V A k
No.3215-2/4
LC8955
Pin Assignment
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Pin Name T2 T1 OUTSET VSS A12 A11 A10 A9 A8 A7 A6 A5 VSS A4 A3 A2 A1 A0 MWEB MCSB VSS IO7 IO6 IO5 IO4 IO3 IO2 IO1 IO0 DD7 VDD DD6 DD5 DD4 DD3 DD2 DD1 DD0 EFLAG READB Type I I I P O O O O O O O O P O O O O O O O P B B B B B B B B I P I I I I I I I I O No. 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 Pin Name WAITB MCK DTENB EOPB SD7 SD6 SD5 SD4 SD3 SD2 SD1 VSS SD0 SA1 SA0 CSB RDB WRB BUSY BUFFULL UNDFLOW DATAEMP MEMPHAS MBITSPL MSPLFRQ MSTEMON RESETB LRCLK WCLK DATA BCLK CLRCLK VDD CWCLK CDATA CBCLK REQB DACKB READYB DONEB Type I I I I B B B B B B B P B I I I I I O O O O O O O O I O O O O I P I I I O I O I
Type I O B P NC
: Input pin : Output pin : Bidirectional pin : Power supply pin : No connection
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
Note) All VDD and VSS pins should be connected to the positive supply or ground.
System Diagram
No.3215-3/4
LC8955
Block Diagram
Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of June, 2001. Specifications and information herein are subject to change without notice.
PS No.3215-4/4

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