eorex

EM488M1644LBA

Jul. 2006

www.eorex.com

4. Operative Command Table

(Note 7)

Current

State

/CS

/R

/C

/W

Addr.

Command

Action

H

X

X

X

X

DESL

Nop or power down

(Note 8)

L

H

H

X

X

NOP or BST

Nop or power down

(Note 8)

L

H

L

H

BA/CA/A10

READ/READA

ILLEGAL

(Note 9)

L

H

L

L

BA/CA/A10

WRIT/WRITA

ILLEGAL

(Note 9)

L

L

H

H

BA/RA

ACT

Row activating

L

L

H

L

BA, A10

PRE/PALL

Nop

L

L

L

H

X

REF/SELF

Refresh or self refresh

(Note 10)

Idle

L

L

L

L

Op-Code

MRS

Mode register accessing

H

X

X

X

X

DESL

Nop

L

H

H

X

X

NOP or BST

Nop

L

H

L

H

BA/CA/A10

READ/READA

Begin read: Determine AP

(Note 11)

L

H

L

L

BA/CA/A10

WRIT/WRITA

Begin write: Determine AP

(Note 11)

L

L

H

H

BA/RA

ACT

ILLEGAL

(Note 9)

L

L

H

L

BA, A10

PRE/PALL

Pre-charge

(Note 12)

L

L

L

H

X

REF/SELF

ILLEGAL

(Note 10)

Row

Active

L

L

L

L

Op-Code

MRS

ILLEGAL

H

X

X

X

X

DESL

Continue burst to end

→ Row active

L

H

H

H

X

NOP

Continue burst to end

→ Row active

L

H

H

L

X

BST

Burst stop

→ Row active

L

H

L

H

BA/CA/A10

READ/READA

Terminate burst, new read:

Determine AP

(Note 13)

L

L

L

L

BA/CA/A10

WRIT/WRITA

Terminate burst, start write:

Determine AP

(Note 13, 14)

L

L

H

H

BA/RA

ACT

ILLEGAL

(Note 9)

L

L

H

L

BA, A10

PRE/PALL

Terminate burst, pre-charging

(Note 10)

L

L

L

H

X

REF/SELF

ILLEGAL

Read

L

L

L

L

Op-Code

MRS

ILLEGAL

H

X

X

X

X

DESL

Continue burst to end

→ Write

recovering

L

H

H

H

X

NOP

Continue burst to end

→ Write

recovering

L

H

H

L

X

BST

Burst stop

→ Row active

L

H

L

H

BA/CA/A10

READ/READA

Terminate burst, start read:

Determine AP 7, 8

(Note 13, 14)

L

L

L

L

BA/CA/A10

WRIT/WRITA

Terminate burst, new write:

Determine AP 7

(Note 13)

L

L

H

H

BA/RA

ACT

ILLEGAL

(Note 9)

L

L

H

L

BA, A10

PRE/PALL

Terminate burst, pre-charging

(Note 15)

L

L

L

H

X

REF/SELF

ILLEGAL

Write

L

L

L

L

Op-Code

MRS

ILLEGAL

Remark H = High level, L = Low level, X = High or Low level (Don't care)

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