eorex

EM48AM3284LBA

Jan. 2009

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5. Command Truth Table for CKE

CKE

Current State

n-1

n

/CS

/R

/C

/W

Addr.

Action

H

X

X

X

X

X

X

INVALID, CLK(n-1) would exit self

refresh

L

H

H

X

X

X

X

Self refresh recovery

L

H

L

H

H

X

X

Self refresh recovery

L

H

L

H

L

X

X

ILLEGAL

L

H

L

L

X

X

X

ILLEGAL

Self Refresh

L

L

X

X

X

X

X

Maintain self refresh

H

H

H

X

X

X

X

H

H

L

H

H

X

X

H

H

L

H

L

X

X

ILLEGAL

H

H

L

L

X

X

X

ILLEGAL

H

L

H

X

X

X

X

ILLEGAL

H

L

L

H

H

X

X

ILLEGAL

H

L

L

H

L

X

X

ILLEGAL

Self Refresh

Recovery

H

L

L

L

X

X

X

ILLEGAL

H

X

X

X

X

X

X

INVALID, CLK(n-1) would exit

power down

L

H

X

X

X

X

X

Exit power down

→ Idle

Power Down

L

L

X

X

X

X

X

Maintain power down mode

H

H

H

X

X

X

H

H

L

H

X

X

H

H

L

L

H

X

Refer to operations in Operative

Command Table

H

H

L

L

L

H

X

Refresh

H

H

L

L

L

L

Op-Code

H

L

H

X

X

X

H

L

L

H

X

X

H

L

L

L

H

X

Refer to operations in Operative

Command Table

H

L

L

L

L

H

X

Self refresh

(Note 17)

H

L

L

L

L

L

Op-Code

Refer to operations in Operative

Command Table

Both Banks

Idle

L

X

X

X

X

X

X

Power down

(Note 17)

H

X

X

X

X

X

X

Refer to operations in Operative

Command Table

Row Active

L

X

X

X

X

X

X

Power down

(Note 17)

H

H

X

X

X

X

Refer to operations in Operative

Command Table

H

L

X

X

X

X

X

Begin clock suspend next cycle

(Note 18)

L

H

X

X

X

X

X

Exit clock suspend next cycle

Any State Other

than Listed above

L

L

X

X

X

X

X

Maintain clock suspend

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

Notes 17: Self refresh can be entered only from the both banks idle state.

Power down can be entered only from both banks idle or row active state.

Notes 18: Must be legal command as defined in Operative Command Table