Overview
The LC89512W integrates a real-time error correction circuit and a SCSI interface in a single chip.

FEATUREs
• Support for double-speed drives at an operating
   frequency of 16.9344 MHz
   Either SRAM (120 ns), DRAM (80 ns) or pseudo
   SRAM (85 ns) can be used.
• Support for quad-speed drives at an operating frequency
   of 33.8688 MHz
   SRAM (70 ns) must be used.
• Built-in SCSI interface with built-in 48 mA sink buffer
   (Only the TARGET function is supported.)
• Built-in 12-byte output FIFO for sub-CPU to host
   computer data transmission
• Built-in 12-byte input FIFO for host computer to subCPU data transmission
• Subcode data can be written to buffer RAM and the subCPU can read the subcode values by connecting the
   LC89512 to the CD-DSP subcode pin.
• Sub-CPU access of buffer RAM through the LC89512
• Built-in function for buffer RAM internal data transfer
• Pseudo-SRAM (128-kword × 8-bit and smaller) can be
   used.
• DRAM (two 256-kword × 4-bit chips or two 1-Mword ×
   4-bit chips) can be used.
• Transfer speeds:
   2.8 MB/second (asynchronous mode) (for CD-ROM
   decode only operation)
   4.2 MB/second (synchronous mode) (CD-ROM decode
   operation is not supported in synchronous mode)
   Both of these transfer modes use a 16.9344 MHz clock.
   (The transfer speed depends on the frequency used.)
• Operating frequencies: 16.9344 MHz (up to double
   speed), 33.8688 (quad speed)

Functions
• CD-ROM error correction function, subcode readout function, SCSI interface