MSM6789 datasheet(7/53 Pages) OKI

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MSM6789A/6789L

PIN DESCRIPTIONS (for MSM6789A (5 V Version)) (Continued)

Symbol

Type

Description

Write Enable. This pin connects to the WE pin of the serial register and DRAM.

This pin selects either read or write mode.

DI/O

I/O

Data I/O. This pin connects to the DIN and DOUT pins of the serial register and

DRAM. This pin outputs write data and inputs read data.

DROM

Data ROM. This pin connects to the DOUT pin of the serial voice ROM.

RAS

This is a row address strobe pin of DRAM at the time of DRAM selection.

CAS0-

CAS7

These are the column address strobe pins of DRAM at the time of DRAM selection.

CAS7, an addresss output pin, is connected to pin A11 of DRAM at the time 16-Mbit

DRAM selection.

CS1

Chip Select. These pins connect to CS pin of the serial register and the CS (CS1,

CS2, CS3) pins of the serial voice ROM.

CS3

CS4

MSEL1

These pins select the capacity of the memory to be connected externally.

These pins select the number of DRAMs and serial registers to be connected externallly.

RSEL1

CS2

MSEL2

RSEL2

MSEL2

MSEL1

RSEL2

RSEL1

Memory capacity

LLLL

¥ 4

LLL

¥ 1

LHL

¥ 8

¥ 4 + 4M ¥ 1

LHL

¥ 2

LHLH

¥ 2

¥ 3

HHH

¥ 3

LLL

¥ 4

16M

¥ 1

HLHL

¥ 6

HLH

¥ 6

¥ 8

HLH

¥ 8

16M

¥ 2

HHHH

16M

¥ 2

• When DRAM is selected (DRAM/SR = High level)

93-100

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