LC8954 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LC8954

Error Correction and AD PCM Playback LSI for CD-I Applications

SANYO -> Panasonic 

Ordering number : EN4127

CMOS LSI

LC8954

Error Correction and AD PCM Playback LSI

for CD-I Applications

Overview

The LC8954 is an error correction and AD PCM decoder

LSI for CD-I applications, and integrates in a single chip

selected functions from the Sanyo LC8951, LC8955 and

LC8953 products. Of the hardware required for CD-I

applications, the LC8954 integrates all of the CD player

output peripheral circuits in a single chip.

Functions

The LC8954 can be roughly divided into three blocks.

• Error correction block

— This block corrects the errors in the CD-ROM data

output from the CD player block.

— The CD-ROM data output from the CD player block

is temporarily buffered in the LC8954 external

SRAM. Error correction is performed automatically

after one sector has been buffered. After error

correction, a CPU interrupt is issued. The CPU

checks that the error correction completed normally,

and transfers data from the SRAM using the

LC8954. Real time performance is achieved by

pipelining the buffering, error correction, and data

transfer operations.

— Nominally error corrected (but actually not

corrected) AD PCM data is transferred at the

discretion of the CPU to the audio block.

— Control of the buffering, error correction, and other

functions is performed by register settings.

• AD PCM decoder block

— Error corrected AD PCM data is transferred to the

AD PCM decoder block (audio block) at the

discretion of the CPU. Actually, data is read from

the LC8954 external SRAM error correction area

and written to the audio area. Then, the audio block

begins playback by reading data from the audio area.

— The LC8954 supports automatic playback of levels

A, B, and C and stereo/mono signals based on

subheader data.

— Expanded data is input to the audio processor

circuit, and output to the D/A converter according to

the gain value set in the LC8954 registers.

— The LC8954 can be directly connected to the Sanyo

LC78835 and LC78835M (8× oversampling digital

filter + D/A converter). CD-DA output from the

audio pins is also supported by internal register

settings.

• 68000 interface block

— The LC8954 can be connected directly to a 68000

CPU.

— The data output from the error correction block is

output after being converted from an 8-bit to a 16-bit

format. Similarly, the sound map written to the AD

PCM block is written after being converted from a

16-bit to an 8-bit format.

— The two pins ACK and RDY are provided for the

interface to the DMA controller. Data can be

transferred in single address mode, burst mode, or

cycle stealing mode.

Features

• Can be directly connected to a 68000 CPU.

• Built-in DMA controller interface

• Built-in APU circuit that supports independent gain

settings in four channels

• Can be directly connected to the Sanyo LC78835 and

LC78835M (digital filter and D/A converter)

• Features from the LC8951 and LC8955 are inherited by

the LC8954.

• Subcode interface on-chip

• External SRAM access from sub-CPU

• CMOS single voltage power supply: 5 V

• By combining features from the LC8951, LC8955, and

portions of theLC8953 into one chip, the peripheral

section of a CD player within a CD-I system can be

constructed with just one chip.

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 Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

O3098HA (OT)/42894TH (OT) VL-0866 No. 4127-1/7

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