M65KA128AL datasheet(18/53 Pages) STMICROELECTRONICS

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Commands

M65KA128AL

18/53

4.13

Self Refresh command

The purpose of the Self Refresh command is used to put the device in Self Refresh mode to

retain and refresh the data contained in the Low Power SDRAM memory array. In Self

Refresh mode, the Low Power SDRAM runs Refresh cycles asynchronously.

The Self Refresh cycle is performed according to the Extended Mode Register settings:

●

EMR3 to EMR4 bits configure the Refresh rate at which the memory array is refreshed

to perform a Temperature Compensated Self Refresh.

●

EMR0 to EMR2 configure the part of the memory array being refresh (Partial Array Self

Refresh).

4.14

Deep Power-Down command

The Deep Power-Down command is used to switch the Low Power SDRAM to Deep Power-

Down Mode. This mode provides maximum power reduction as it cuts the power of the

entire memory array of the device. For more information on how the command is issued and

its exit sequence, see Section 3.7: Deep Power-Down, Figure 25: Deep Power-Down Entry

AC Waveforms, and Figure 26: Deep Power-Down Exit AC Waveforms.

Table 3.

Commands(1)

Command

KEn-1 KEn

RAS

CAS

UDQM

LDQM

A10

A9,

A11

A0-A7

BA0-

BA1

DQ0-

DQ7

DQ8-

DQ15

Mode Register

Set(2)

VIH

XVIL

VIL

Op Code

Extended Mode

VIH

XVIL

VIL

Op Code

Bank (Row)

Active

VIH

XVIL

VIL

VIH

Start Row Address

Bank

Select

Word Read/Read

with Auto

Precharge

VIH

XVIL

VIH

VIL

VIH

VIL

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Output

Valid

Upper Byte

Read/Read with

Auto Precharge

VIH

XVIL

VIH

VIL

VIH

VIL

VIH

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Hi-Z

Output

Valid

Lower Byte

Read/Read with

Auto Precharge

VIH

XVIL

VIH

VIL

VIH

VIL

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Output

Valid

Hi-Z

Word Write/Write

with Auto

Precharge

VIH

XVIL

VIH

VIL

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Input

Valid

Upper Byte

Write/Write with

Auto Precharge

VIL

VIH

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Hi-Z

Input

Valid

Lower Byte

Write/Write with

Auto Precharge

VIH

VIL

VIL/VIH

(3)

Start

Column

Address

Bank

Select

Input

Valid

Hi-Z

Write with Auto

Precharge

VIH

XVIL

VIH

VIL

VIH

Start

Column

Address

Bank

Select

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