MSM6789A Просмотр технического описания (PDF) - Oki Electric Industry
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MSM6789A Datasheet PDF : 53 Pages
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¡ Semiconductor
MSM6789A/6789L
PIN DESCRIPTIONS (for MSM6789A (5 V Version)) (Continued)
Pin
74
73
85
89
93-100
81
82
83
84
58
59
Symbol
WE
DI/O
DROM
RAS
CAS0-
CAS7
CS1
CS2
CS3
CS4
MSEL1
MSEL2
Type
Description
Write Enable. This pin connects to the WE pin of the serial register and DRAM.
O
This pin selects either read or write mode.
Data I/O. This pin connects to the DIN and DOUT pins of the serial register and
I/O
DRAM. This pin outputs write data and inputs read data.
I Data ROM. This pin connects to the DOUT pin of the serial voice ROM.
O This is a row address strobe pin of DRAM at the time of DRAM selection.
These are the column address strobe pins of DRAM at the time of DRAM selection.
O CAS7, an addresss output pin, is connected to pin A11 of DRAM at the time 16-Mbit
DRAM selection.
Chip Select. These pins connect to CS pin of the serial register and the CS (CS1,
O CS2, CS3) pins of the serial voice ROM.
I
These pins select the capacity of the memory to be connected externally.
I
These pins select the number of DRAMs and serial registers to be connected externallly.
• When DRAM is selected (DRAM/SR = High level)
56 RSEL1
I
57 RSEL2
I
MSEL2
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
MSEL1
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
RSEL2
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
RSEL1
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
Memory capacity
1M ¥ 4
4M ¥ 1
1M ¥ 8
1M ¥ 4 + 4M ¥ 1
4M ¥ 2
4M ¥ 2
4M ¥ 3
4M ¥ 3
4M ¥ 4
16M ¥ 1
4M ¥ 6
4M ¥ 6
4M ¥ 8
4M ¥ 8
16M ¥ 2
16M ¥ 2
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