lc895124 Sanyo Semiconductor Corporation, lc895124 Datasheet - Page 7

• Manufacturer Part Number: lc895124
• Description: Cd-rom Driver With On-chip Scsi Interface
• Manufacturer: Sanyo Semiconductor Corporation

Pin Functions
1. SCSI Pins
2. Microcontroller Interface Pins
3. Buffer RAM Pins
4. CD DSP Data Pins
• BSY, ACK, MSG, SEL, REQ, ATN, I/O, C/D (input and output)
• DB0 to DB7, DBPB (input and output)
• ZCS (input)
• CSCTRL (input)
• ZRD, ZWR, SUA0 to SUA6 (input)
• ZSWAIT (output)
• D7 to D0 (input and output)
• ZINT0, ZINT1 (output)
• IO0 to IO15 (input and output)
• RA0 to RA16 (output)
• ZRAS0, ZRAS1, (ZCS0), (ZCS1) (output)
• ZCAS0, ZCAS1 (output)
• ZOE (output)
• ZUWE, ZLWE (output)
• BCK, SDATA, LRCK, C2PO (input)
SCSI bus control pins.
These are the SCSI data bus pins.
Microcontroller chip select line
Microcontroller chip select logic selection signal
High - ZCS is an active low signal.
Low - ZCS is an active high signal.
Microcontroller interface control signal
The SUA0 to SUA6 pins are used for addressing.
When the microcontroller accesses RAM, it must wait if this pin is low.
This is a built-in pull-up resistor open drain output.
Microcontroller data bus. Pull-up resistors are built in.
Interrupt request output to the microcontroller. A SCSI-side interrupt can be output from ZINT1 by setting the C
register (bit 7 in R11).
This is a built-in pull-up resistor open drain output.
Buffer RAM data bus. Pull-up resistors are built in. The IO8 to IO15 pins have shared functions as the RA9 to
RA16 pins.
This means that 16-bit PSRAM cannot be used.
Buffer RAM address lines. RA9 to RA16 have shared functions as the IO8 to IO15 pins.
This means that 16-bit PSRAM cannot be used.
Buffer DRAM RAS outputs. Normally, ZRAS0 is used. However, when two 1-MB (64k
are used, the respective DRAM RAS pins are connected to ZRAS0 and ZRAS1. Connected to the CS pin if
PSRAM is used.
Buffer DRAM CAS outputs. Normally, ZCAS0 is used. However, when two 1-MB (64k
are used, the respective DRAM CAS pins are connected to ZCAS0.
Buffer RAM read output signal
Buffer RAM write output signals. Connected to the corresponding pins on the RAM chip.
Leave ZUWE open if an 8-bit RAM is used.
The LC895124 reads in CD-ROM data over these pins connected to a CD DSP.
C2PO is the C2 flag pin.
LC895124
16-bit) DRAM chips
16-bit) DRAM chips
No. 5240-7/8