M65KA128AL datasheet(17/53 Pages) STMICROELECTRONICS

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M65KA128AL

Commands

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In order to write all data to the memory cell correctly, the asynchronous parameter tDPL must

be satisfied. The tDPL (min.) specification defines the earliest time that a precharge

command can be issued.

After the Precharge command is issued, a minimum time of tRP is required before the

bank(s) are available.

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 cycle. Read or Write with Auto Precharge is initiated if the A10 Address Input is

High, at 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 the 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 the Read or Write data. A Data Mask command

issued during a Read cycle 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 cycle 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 Low Power

SDRAM. The command is controlled by the Clock Enable input, KE, which is 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 cycles.

4.11

Power-Down command

The Power-Down command is used to put the device in Power-Down mode where the

operating current is reduced to the Standby current.

All banks must be precharged and a minimum time of tRP must elapse before issuing the

Power-Down command.

4.12

Auto Refresh command

The Auto Refresh command is used to put the device in Auto refresh mode (see Section 3.5:

Auto Refresh).

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