GENERAL DESCRIPTION

The SAA7390 is a high integration ASIC that incorporates all of the logic necessary to connect a CD-60 based decoder to a SCSI or ATAPI host. It also supports a data path from the host to the CDCEP (compact disc encoder) for CD-R applications. An 80C32 microcontroller and a 53CF94/92A (or an ATAPI interface device) are required to provide the full block encode/decode functions.

1 FEATURES

General

? 8× speed CD-ROM, 4× speed Compact

Disc-Recordable (CD-R) controller

? 16.9 Mbytes/s burst rate to host controller

? High performance CD-ROM and CD-R interface logic

? 128 pin QFP package.

Interface logic (CD-ROM operation)

? 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.

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.

Interface logic (CD-R operation)

? Block encoder (using a modified CDB2).

DRAM buffer controller (256 kbytes × 8, 1 Mbyte × 8, 4 Mbytes × 8)

? DRAM buffer manager

? Ten level arbitration logic

? Utilizes low cost 70 ns DRAMs

? Page mode DRAM access for high-speed error correction and host interface data transfers

? Data organization by 3 kbytes frames.

Additional product support

? Input clock doubler

? All control registers mapped into 80C32 special function memory space

? Red book audio pass through to host interface

? Sub-code and Q-channel support

? Dedicated Serial Peripheral Interface (SPI)

? Third level error correction and encoding

? 80C32 microcontroller interface

? 53CF90 or 53CF92A/B fast SCSI processor interface (may also use ATAPI processor).