Rev. 1.1 / May. 2005

12

OPERATION COMMAND TRUTH TABLE - IV

Note :

1. H - Logic High Level, L - Logic Low Level, X - Don’t Care, V - Valid Data Input,

BA - Bank Address, AP - AutoPrecharge Address, CA - Column Address, RA - Row Address, NOP - NO Operation.

2. All entries assume that CKE was active(high level) during the preceding clock cycle.

3. If both banks are idle and CKE is inactive(low level), then in power down mode.

4. Illegal to bank in specified state. Function may be legal in the bank indicated by Bank Address(BA) depending on the state of

that bank.

5. If both banks are idle and CKE is inactive(low level), then self refresh mode.

6. Illegal if tRCD is not met.

7. Illegal if tRAS is not met.

8. Must satisfy bus contention, bus turn around, and/or write recovery requirements.

9. Illegal if tRRD is not met.

10. Illegal for single bank, but legal for other banks in multi-bank devices.

11. Illegal for all banks.

Current

State

/CS

/RAS

/CAS

/WE

Address

Command

Action

WRITE

L

H

L

L

BA, CA, AP

WRITE/WRITEAP

LL

H

H

BA, RA

ACT

LL

H

L

BA, AP

PRE/PALL

LL

L

H

X

AREF/SREF

LL

L

L

OPCODE

MRS

MODE

REGISTER

ACCESSING

H

X

X

X

X

DSEL

NOP - Enter IDLE after tMRD

L

H

H

H

X

NOP

NOP - Enter IDLE after tMRD

LH

H

L

X

BST

L

H

L

H

BA, CA, AP

READ/READAP

L

H

L

L

BA, CA, AP

WRITE/WRITEAP

LL

H

H

BA, RA

ACT

LL

H

L

BA, AP

PRE/PALL

LL

L

H

X

AREF/SREF

LL

L

L

OPCODE

MRS