LC895195 Datasheet, PDF (7/8 Pages) Sanyo Semicon Device – ATA-PI (IDE) CD-ROM Decoder LSI

LC895195
• ZSWAIT (output)
When the microcontroller is accessing RAM, the sub-CPU must wait if this pin is low.
• D7 to D0 (I/O)
Microcontroller data bus. Pull-up resistors are built in.
• ZINT (output)
Interrupt request signal output to the microcontroller. A pull-up resistor is built in.
• ZINT1 (output)
Interrupt request signal output from the IDE block to the microcontroller. An external pull-up resistor must be
connected to this pin.
3. Buffer RAM Pins
• IO0 to IO15 (I/O)
Buffer DRAM data bus. A pull-up resistor is built in.
• RA0 to RA9 (output)
Buffer RAM address lines.
• ZRAS0, ZRAS1 (output)
Buffer DRAM RAS outputs. Normally, ZRAS0 is used, but if two 1-Mb (64k × 16 bits) chips are used, then both
ZRAS0 and ZRAS1 are used, one for each of the chips.
• ZCAS0, ZCAS1 (output)
Buffer DRAM CAS outputs. Normally, ZCAS0 is used, but if two 1-Mb (64k × 16 bits) chips are used, then both
ZCAS0 and ZCAS1 are used, one for each of the chips. When using a two-CAS type DRAM, connect ZCAS0 to
UCAS, and ZCAS1 to LCAS.
• ZOE (output)
Buffer DRAM read output signal.
• ZUWE, ZLWE (output)
Buffer DRAM write output signals. Connected the corresponding DRAM pins.
4. Subcode Interface Pins
• EXCK, WFCK, SBSO, SCOR (input or output)
These are the subcode interface connections. The LC895195 acquires subcode data by connection with the CD-
DSP and sends that data to the host.
5. CD-DSP Data Pins
• BCK, SDATA, LRCK, C2PO (input)
The LC895195 reads in the CD-ROM data by connecting to the CD-DSP.
The C2PO pin is used for the C2 flags.
6. Other Pins
• ZRESET (input)
This is the LC895195 reset pin. The LC895195 is reset by a low level on this pin.
This pin must be held low for at least 1 µs when power is first applied.
• XTALCK, XTAL
These pins can drive a 16.9344-MHz or 33.8688-MHz oscillator.
Alternatively, an external clock can be input to the XTALCK pin.
• MCK (output)
This pin outputs either the XTALCK frequency or that frequency divided by 2. This output can be turned off.
• MCK2 (output)
This pin outputs either the XTALCK frequency or that frequency divided by 512. This output can be turned off.
• ZRSTIC (output)
This pin can be set to output a low level either by writing to the microcontroller write register R46 bit 7
(ZSYSRTS) or by setting the ZHRST pin (pin 103) low. This pin goes to the high-impedance state when both
ZSYSRST and ZHRST are high.
Since this pin has an open-drain circuit, an external pull-up resistor must be used.
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