M65KA512AB datasheet(17/55 Pages) STMICROELECTRONICS

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M65KA512AB

Commands

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4.4

Write command

The Write command is used to switch the Low-Power SDRAM to Burst Write mode (see

Section 3.3: Burst Write mode).

4.5

Read command

The Read command is used to switch the Low-Power SDRAM to Burst Read mode (see

Section 3.2: Burst Read).

4.6

Precharge command

The Precharge command is used to close the open row in a particular bank or the open row

in all banks. When the precharge command is issued with address A10 driven High, all

banks will be precharged. If A10 is driven Low, the open row in a particular bank will be

precharged. The bank(s) will be available when the minimum tRP time has elapsed after the

precharge command has been issued.

4.7

Auto Precharge command

The Auto Precharge command is used to close the open row in a specific bank after a Read

or Write operation. A10 is High, VIH, when a Read (or Write) command is issued.

4.8

Burst Terminate command

The Burst Terminate command is used to terminate a Burst operation. A Burst operation can

be interrupted by using the Precharge command (see Section 4.6: Precharge command for

details), or by issuing the Burst Terminate command. Issuing the Burst Terminate command

during a Burst Read or Write cycle will terminate the burst while leaving the bank open.

4.9

Data Mask command

The Data Mask command is used to mask Read or Write data.A Data Mask command

issued during a Read operation will disable the data outputs, switching them to the high

impedance state after a delay of two clock cycles. A Data Mask command issued during a

Write operation will disable the data inputs with no delay.

4.10

Clock Suspend command

The Clock Suspend command is used to interrupt the internal clock of the LPSDRAM. The

command is controlled by the Clock Enable input, KE, which is kept High, VIH, in normal

access mode.The Clock Suspend command is issued by driving KE Low,VIL, thus freezing

the internal clock, and extending data Read and Write operations.

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