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SAA7385GP

Error correction and host interface IC for CD-ROM (SEQUOIA)

Philips Electronics 

Philips Semiconductors

Error correction and host interface IC for

CD-ROM (SEQUOIA)

Preliminary specification

SAA7385

1 FEATURES

1.1 General

• Single chip digital solution for an 8 × speed CD-ROM

controller chip

• 10 Mbytes/s NCR53CF94 equivalent SCSI controller

included

• High-speed 80C32 microcontroller with 256 × 8

scratch-pad SRAM included

• High performance CD-ROM interface logic

• 128 pin QFP package.

1.2 53CF94 SCSI controller

• Separate clock input to allow operation up to the

maximum 10 Mbytes/s

• Fast synchronous SCSI-2 compatible

• 24-bit transfer counter for single transfers up to

16 Mbytes

• High-speed 16-bit DMA interface to the buffer manager

DRAM

• On-chip 48 mA SCSI drivers

• Software compatible with members of the 53C90 family

• Allows for SCAM support.

1.5 Buffer controller

• Ten level arbitration logic

• Utilizes low cost 70 ns DRAMs

• Page mode DRAM access for high-speed error

correction and SCSI data transfer

• Data organization by 3 kbyte frames

• 256 kbyte or 1 Mbyte DRAM supported.

1.6 Hardware third-level error correction

• Third-level correction provides superior performance in

unfavourable conditions

• Full hardware error correction to reduce microcontroller

overhead

• Corrections are automatically written to the DRAM

frame buffer.

1.7 Additional product support

• All control registers mapped into 80C32 special function

memory space

• Dedicated S2B interface UART

• Input clock synthesizer

• Red book audio pass through.

1.3 80C32 high-speed microcontroller

• 33.87 MHz full system speed operation

• Three timers/event counters

• Programmable full duplex serial channel

• Eight general purpose microcontroller I/O pins

• External program ROM.

1.4 Front-end interface logic

• Full 8 × speed hardware operation

• Block decoder

• Sector sequencer

• CRC checking of Mode 1 and Mode 2, Form 1 sectors

• 212 ms watch-dog timer

• Sub-code interface with synchronization

• C-flag interface for absolute time stamp.

2 GENERAL DESCRIPTION

The SAA7385 is a high integration ASIC that incorporates

all of the digital electronics necessary to connect a CD

decoder to a SCSI host. An 80C32 microcontroller and a

53CF94 SCSI controller are embedded in the ASIC.

The following functions are supported:

• Input clock doubler

• Block decoder

• CRC checking of Mode 1 and Mode 2, Form 1 sectors

• Red book audio pass through to SCSI

• Buffer manager

• Third-level error correction

• Sub-code and Q-channel support

• Dedicated S2B interface UART

• Embedded 80C32 microcontroller

• Embedded 53CF94 SCSI controller.

1996 Jun 19

3

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