SAA7385 Datasheet, PDF (3/64 Pages) NXP Semiconductors – Error correction and host interface IC for CD-ROM SEQUOIA

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