MK31VT464-10YE (98.07.24)

Page 11/11

FUNCTION TRUTH TABLE (CKE) (Table2)

Current State(n)

CKEn-1

CKEn

/CS

/RAS

/CAS

/WE

ADDR

Action

Self Refresh

H

X

X

X

X

X

X

INVALID

L

H

H

X

X

X

X

Exit Self Refresh

Æ ABI

L

H

L

H

H

H

X

Exit Self Refresh

Æ ABI

L

H

L

H

H

L

X

ILLEGAL

L

H

L

H

L

X

X

ILLEGAL

L

H

L

L

X

X

X

ILLEGAL

L

L

X

X

X

X

X

NOP (Maintain Self Refresh)

Power Down

H

X

X

X

X

X

X

INVALID

L

H

H

X

X

X

X

Exit Power Down

Æ ABI

L

H

L

H

H

H

X

Exit Power Down

Æ ABI

L

H

L

H

H

L

X

ILLEGAL

L

H

L

H

L

X

X

ILLEGAL

L

H

L

X

X

X

X

ILLEGAL

6

L

L

X

X

X

X

X

NOP (Continue power down mode)

All Banks idle

6

H

H

X

X

X

X

X

Refer to Table 1

(ABI)

H

L

H

X

X

X

X

Enter Power Down

H

L

L

H

H

H

X

Enter Power Down

H

L

L

H

H

L

X

ILLEGAL

H

L

L

H

L

X

X

ILLEGAL

H

L

L

L

H

L

X

ILLEGAL

H

L

L

L

L

H

X

Enter Self Refresh

H

L

L

L

L

L

X

ILLEGAL

LL

X

X

X

X

X

NOP

Any State

H

H

X

X

X

X

X

Refer to Operations in Table 1

Other than

H

L

X

X

X

X

X

Begin Clock Suspend Next Cycle

Listed Above

L

H

X

X

X

X

X

Enable Clock of Next Cycle

L

L

X

X

X

X

X

Continue Clock Suspension

Notes:

6.

Power-down and self refresh can be entered only when all the banks are in an idle state.