M65KA128AL datasheet(20/53 Pages) STMICROELECTRONICS

Part #	M65KA128AL

Description	128Mbit (4 Banks x 2M x 16) 1.8V Supply, Low Power SDRAMs

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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M65KA128AL

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5.1

Mode Register description

The Mode Register is used to select the CAS Latency (1, 2 or 3), the Burst Type (sequential,

interleaved), and the Burst Length (1-, 2-, 4-, 8-Word width or full page).

It is loaded by issuing a Mode Register Set command that programs A0 to A11 address bits.

The values placed on the address lines are then latched into the Mode Register. BA0-BA1

must be set to ‘0’.

See Table 4: Mode Register Definition, for more details.

Table 4.

Mode Register Definition

Address

Bits

Mode

Description

Value

Bit Description

A11-A7

00000

A6-A4

MR6-MR4

CAS Latency Bits

010

2 Clock Cycles

011

3 Clock Cycles

Other configurations reserved

MR3

Burst Type

Sequential

Interleaved

A2-A0

MR2-MR0

Burst Length Bit

000

1 Word (A3 is Don’t Care)

001

2 Words (A3 is Don’t Care)

010

4 Words (A3 is Don’t Care)

011

8 Words (A3 is Don’t Care)

111

Full Page if A3 Low

Reserved if A3 High

Other configurations reserved

BA1-BA0

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