MSM7630 datasheet(4/95 Pages) OKI

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MSM7630

¡ Semiconductor

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PIN DESCRIPTIONS

Description

Type

I/O

16-bit data bus. 8-bit devices are accessed through D31-24.

24-bit address bus. DRAM addresses are output from A13-0.

ROM select signal. ROM indicates that ROM space is assigned to the specified address.

It is used as a chip select signal.

SRAM select signal. SRAM indicates that SRAM space is assigned to the specified address.

It is used as a chip select signal.

Read signal. RD is active during both 8-bit and 16-bit reads.

Write signals. WR0 corresponds to writes from D31-24, and WR1 corresponds to

writes from D23-16.

Row address strobe. RAS is active during both 8-bit and 16-bit reads.

Write enable. WE is active during writes to DRAM space as the DRAM write signal.

Address strobe.

Serial data output.

Serial data input.

Symbol

D31-16

A23-0

ROM

SRAM

WR0,1

TXD

RXD

RAS

Column address strobe. CAS0 corresponds to accesses from D31-24, and CAS1

corresponds to accesses from D23-16.

CAS0,1

Control signal indicating SIO can transmit and receive.

Input signal indicating that modem is in operable state.

DTR

DSR

SIO transmit request signal.

Input signal indicating that modem can transmit.

RTS

CTS

I/O

Synchronous transfer clock output.

Parallel port data input/output.

SCLK

PD7-0

Parallel port read signal. Set high for Centronics interface.

PACK

Parallel port write signal. Strobe signal for Centronics interface.

PSTB

Parallel port chip select signal.

PCS

Parallel port address signal. Selects data or status during an access.

PIOA

3-state

Output port buffer full. Indicates that data has been set in the output buffer.

POBF

3-state

Input port buffer full. Indicates that there is data in the input buffer.

Busy output signal for Centronics interface.

PIBF

General flag output signal.

UPORT

Connects with SG.

TEST0

D/A converter output.

DAO1

Signal ground. Connects with TEST0.

Clock input signal.

CLK

Clock signal. Inverse of CLK.

Internal clock signal.

CLKA

Reset input.

RST

Standby signal. STBY suspends operation and places the MSM7630 in a standby state.

STBY

External interrupt signal.

EXTINT

Test mode select input signal.

TSTM2,1

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