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参数资料
| 型号： | LC8954 |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封装： | QFP-128 |
| 文件页数： | 1/7页 |
| 文件大小： | 50K |
| 代理商： | LC8954 |
Ordering number : EN4127
O3098HA (OT)/42894TH (OT) VL-0866 No. 4127-1/7
LC8954
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Error Correction and AD PCM Playback LSI
for CD-I Applications
CMOS LSI
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.
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.
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相关代理商/技术参数 |
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| LC8955 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:CD-1 Format ADPCM Data Replay LSI |
| LC8956 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Error Correction and ADPCM Decoder IC for CD-1/CD-ROM XA Systems |
| LC89560-3151 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CD-ROM Interface |
| LC89560-3181 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CD-ROM Interface |
| LC89561-3151 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:CD-ROM Interface |
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