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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.