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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