MS82V16520A-8GA 查看數據表（PDF） - Oki Electric Industry

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MS82V16520A-8GA

262,144-Word × 32-Bit × 2-Bank SGRAM

Oki Electric Industry 

OKI Semiconductor

FEDS82V16520A-01

MS82V16520A

PIN DESCRIPTION

CLK

CS

CKE

Address

BA

RAS

CAS

WE

DQM0 to

DQM3

DQ0 to

DQ31

Fetches all inputs at the "H" edge.

Disables or enables device operation by asserting or deactivating all inputs except CLK, CKE,

DQM0, DQM1, DQM2 and DQM3.

Masks system clock to deactivate the subsequent CLK operation.

If CKE is deactivated, system clock will be masked so that the subsequent CLK operation is

deactivated. CKE should be asserted at least one cycle prior to a new command.

Row & column multiplexed.

Row address: RA0 to RA9, Column address: CA0 to CA7

Selects bank to be activated during row address latch time and selects bank for precharge and

read/write during column address latch time.

BA = “L”: Bank A

BA = “H”: Bank B

Functionality depends on the combination. For details, see the function truth table.

Masks the read data of two clocks later when DQM0 to DQM3 are set "H" at the "H" edge of the

clock signal.

Masks the write data of the same clock when DQM0 to DQM3 are set "H" at the "H" edge of the

clock signal.

DQM0 controls DQ0 to DQ7, DQM1 controls DQ8 to DQ15, DQM2 controls DQ16 to DQ23, and

DQM3 controls DQ24 to DQ31.

Data inputs/outputs are multiplexed on the same pin.

*Notes: 1. When CS is set "High" at a clock transition from "Low" to "High", all inputs except CLK, CKE,

DQM0, DQM1, DQM2, and DQM3 are invalid.

2. When issuing an active, read or write command, the bank is selected by BA.

BA

Active, read or write

0

Bank A

1

Bank B

3. The auto precharge function is enabled or disabled by the A9 input when the read or write

command is issued.

A9

BA

Operation

0

0

After the end of burst, bank A holds the active status.

1

0

After the end of burst, bank A is prechaged automatically.

0

1

After the end of burst, bank B holds the active status.

1

1

After the end of burst, bank B is prechaged automatically.

4. When issuing a precharge command, the bank to be precharged is selected by the A9 and

BA inputs.

A9

BA

Operation

0

0

Bank A is precharged.

0

1

Bank B is precharged.

1

×

Both banks are precharged.

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