Sanyo LC8955 Specifications
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
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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
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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
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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
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