EDW2032BBBG

Data Sheet E1864E10 (Ver. 1.0)

10

1.6

Commands

Table 6: Command Truth Table

Notes: 1.

H = logic high level; L = logic low level; X = Don’t Care. Signal may be H or L, but not floating.

2.

Addresses shown are logical addresses; physical addresses are inverted when address bus inversion (ABI) is

activated and /ABI=L.

3.

BA0-BA3 provide the Mode Register address (MRA), A0-A11 the opcode to be loaded.

4.

BA0-BA3 provide the bank address (BA), A0-A12 provide the row address (RA).

5.

BA0-BA3 provide the bank address, A0-A5 (A6) provide the column address (CA); no sub-word addressing within a

burst of 8.

6.

This command is REFRESH when /CKE(n) = L, and SELF-REFRESH ENTRY when /CKE(n) is H.

7.

BA0-BA2 select burst location (BST) and A0-A9, BA3 provide the data.

8.

DESELECT and NO OPERATION are functionally interchangeable.

9.

In address training mode READ is decoded from the command pins only with /RAS = H, /CAS = L, /WE= H.

Operation

Code

/CKE

n-1

/CKE

n

/CS

/RAS /CAS /WE

BA3-

BA0

A11 A10 A8

A6-A7,

A9,A12

A0-A5

(A6)

Note

DESELECT

DESEL

L

X

H

X

X

X

X

XXXX

X

2,8

NO OPERATION

(NOP)

NOP

L

X

L

H

H

H

X

XXXX

X

2,8

MODE REGISTER

SET

MRS

L

L

L

L

L

L

MRA

OPCODE

2,3

ACTIVATE

ACT

L

L

L

L

H

H

BA

RA

2,4

READ

RD

L

L

L

H

L

H

BA

L

L

L

X

CA

2,5,9

READ with

Autoprecharge

RDA

L

L

L

H

L

H

BA

L

L

H

X

CA

2,5

LOAD FIFO

LDFF

L

L

L

H

L

H

BST

H

L

L

DATA

2,7

READ TRAINING

RDTR

L

L

L

H

L

H

X

H

H

L

X

X

2

WRITE without Mask

WR

L

L

L

H

L

L

BA

L

L

L

X

CA

2,5

WRITE without Mask

with Autoprecharge

WRA

L

L

L

H

L

L

BA

L

L

H

X

CA

2,5

WRITE with Single

Byte Mask

WSM

L

L

L

H

L

L

BA

L

H

L

X

CA

2,5

WRITE with

Autoprecharge, Single

Byte Mask

WSMA

L

L

L

H

L

L

BA

L

HHX

CA

2,5

WRITE with Double

Byte Mask

WDM

L

L

L

H

L

L

BA

H

L

L

X

CA

2,5

WRITE with

Autoprecharge,

Double Byte Mask

WDMA

L

L

L

H

L

L

BA

HL

HX

CA

2,5

WRITE TRAINING

WRTR

L

L

L

H

L

L

X

H

H

L

X

X

2

PRECHARGE

PRE

L

L

L

L

H

L

BA

X

X

L

X

X

2

PRECHARGE ALL

PREALL L

L

L

L

H

L

X

X

X

H

X

X

2

REFRESH

REF

L

L

L

L

L

H

X

XXXX

X

6

POWER-DOWN

ENTRY

PDE

L

H

H

X

X

X

X

XXXX

X

LH

H

H

POWER-DOWN

EXIT

PDX

H

L

H

X

X

X

X

XXXX

X

LH

H

H

SELF REFRESH

ENTRY

SRE

L

H

L

L

L

H

X

XXXX

X

6

SELF REFRESH

EXIT

SRX

H

L

H

X

X

X

X

XXXX

X

LH

H

H