MS82V16520 데이터 시트보기 (PDF) - Oki Electric Industry

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MS82V16520

262,144-Word x 32-Bit x 2-Bank Synchronous Graphics RAM

Oki Electric Industry 

¡ Semiconductor

MS82V16520

PIN DESCRIPTION

CLK

CS

CKE

Address

BA (A10)

RAS

CAS

WE

DSF

DQM0 -

DQM3

DQi

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 – RA9

Column address: CA0 – 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.

DSF is part of the inputs of graphics command of the MS82V16520.

If DSF is inactive (Low level), MS82V16520 operates just like SDRAM.

Masks the read data of two clocks later when DQM0 - DQM3 are set "H" at the "H" edge of the clock signal.

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

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 (A10).

BA (A10)

0

1

Active, read or write

Bank A

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 precharged automatically.

0

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

1

1 After the end of burst, bank B is precharged automatically.

4. When issuing a precharge command, the bank to be precharged is selected by the A9 and BA (A10)

inputs.

A9

BA

Operation

0

0 Bank A is precharged.

0

1 Bank B is precharged.

1

X Both banks A and B are precharged.

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