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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.

FEATURES

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.

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.

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.

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