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.
CMOS IC
CD-I Format ADPCM Data Replay IC
Ordering number:ENN3215B
LC8955
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
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.
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.
Functional Description
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.
™ 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.
Package Dimensions
unit:mm
3044B-QIP80A
[LC8955]
20.0
14.0
3.0
1.0
0.35
0.8
1.0
26.0
20.0
0.8
0.8
64
65
80
1
0.35
22.6
3.0
0.8
0.15
41
40
25
24
2.45max
1.7
SANYO : QIP80A
2.15
1.7
16.6
1.7
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
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatlovylppusmumixaMV
egatlovtuptuo/tupnIV
noitapissidrewopelbawollAxamdPaT ≤ 07°C 053Wm
erutarepmetgnitarepOrpoT –07+ot03
erutarepmetegarotSgtsT –521+ot55
erutarepmetredloS ylnosnipfognippid,.s01 062
Allowable Operating Conditions at Ta = –30 to +70˚C, VSS = 0V
retemaraPlobmySsnoitidnoC
egatlovylppuSV
egnaregatlovtupnIV
xam52=aT°C – 0.7+ot3.0V
DD
I,VO
DD
NI
52=aT°C – Vot3.0
nimpytxam
5.40.55.5V
0V
3.0+V
DD
˚C
˚C
˚C
sgnitaR
tinU
V
DD
DC Characteristics at Ta = –30 to +70˚C, VSS = 0V, VDD = 4.5 to 5.5V
retemaraPlobmySsnoitidnoC
egatlovlevel-hgihtupnIV
egatlovlevel-woltupnIV
egatlovlevel-hgihtupnIV
egatlovlevel-woltupnIV
egatlovlevel-hgihtuptuOV
egatlovlevel-woltuptuOV
tnerrucegakaeltupnII
rotsiserpu-lluPR
1HI
1LI
2HI
2LI
HO
LO
L
PU
0ot7DS
I:sniptuptuollA
=– Am34.2V
HO
I:sniptuptuollA
Am3=4.0V
LO
V:sniptupnillA
IV=SSV,DD
7ot0DS,7ot0OI010204kΩ
sgnitaR
nimpytxam
,0ot7OI,BPOE,BTESERtpecxesniptupnillA
0ot7DS,0ot7OI,BPOE,BTESER
2.2V
5.2V
–5252+Aµ
tinU
8.0V
6.0V
No.3215–2/4
LC8955
Pin Assignment
T ype
I : Input pin
O : Output pin
B : Bidirectional pin
P : Power supply pin
NC : No connection
Note) All VDD and VSS pins should be connected to the
positive supply or ground.
.oNemaNniPepyT
12TI
21TI
3TESTUOI
4V
SS
521AO
611AO
701AO
89AO
98AO
017AO
116AO
215AO
31V
SS
414AO
513AO
612AO
711AO
810AO
91BEWMO
02BSCMO
12V
SS
227OIB
326OIB
425OIB
524OIB
623OIB
722OIB
821OIB
920OIB
037DDI
13V
DD
236DDI
335DDI
434DDI
533DDI
632DDI
731DDI
830DDI
93GALFEI
04BDAERO
P
P
P
P
.oNemaNniPepyT
14BTIAWI
24KCMI
34BNETDI
44BPOEI
547DSB
646DSB
745DSB
844DSB
943DSB
052DSB
151DSB
25V
350DSB
451ASI
550ASI
65BSCI
75BDRI
85BRWI
95YSUBO
06LLUFFUBO
16WOLFDNUO
26PMEATADO
36SAHPMEMO
46LPSTIBMO
56QRFLPSMO
66NOMETSMO
76BTESERI
86KLCRLO
96KLCWO
07ATADO
17KLCBO
27KLCRLCI
37V
47KLCWCI
57ATADCI
67KLCBCI
77BQERO
87BKCADI
97BYDAERO
08BENODI
SS
DD
P
P
System Diagram
No.3215–3/4
Block Diagram
LC8955
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 exported without obtaining the export 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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