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GENERAL DESCRIPTION

The SAA7391 is a block decoder/encoder and buffer manager for high-speed CD-ROM/CD-R functions, that integrates real time error correction and detection and bidirectional ATAPI transfer functions into a single chip.

FEATURES

? Supports real time error detection and correction in hardware. Error correction to n = 27, error detect to n = 30 and raw data transfer to n = 32.

? CD-R to CD-n greater than 8. Internal operation is faster, but firmware and physical (laser/media) factors limit the speed

? DVD-ROM supported in combination with the SAA7335

? Direct generic interface to external Small Computer Systems Interface (SCSI) controller devices

? Operates with up to 16 Mbytes DRAM

– Hyper-page DRAM up to 33 Mbytes words/s burst

– Fast-page DRAM at up to 17.5 Mbytes words/s burst

? Has fixed n = 1 or n = 2 rate (44.1 or 88.2 kHz) I2S-bus multimedia output for simple audio/video output; features for CAV/quasi-CLV support

– Supports Philips multimedia audio CODEC

– Provides ‘SHOARMA’ Red Book audio buffer

? IEC 958 (SPDIF, AES/EBU and DOBM) output with Q-W subcode and programmable category code, output at n = 1 rate

? Device registers are memory mapped for faster direct access to the chip

? Provides direct access from sub-CPU to buffer RAM to support scratchpad accesses. This eliminates the need for extra RAM chips in the system

? Automatic sequencing of ATAPI packet command protocol, including command termination

? Automated data transfers to and from the host using PIO, DMA and ultra DMA.