W989D6KB datasheet(20/66 Pages) WINBOND

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W989D6KB / W989D2KB

512Mb Mobile LPSDR

Publication Release Date : October 07, 2013

- 20 -

Revision : A01-003

8.1.3 Function Truth Table for CKE

Current State

CKE

RAS

CAS

Address

Action

Notes

n-1

Self refresh

N/A

Exit Self Refresh → Idle after tRFC

ILLEGAL

Maintain Self Refresh

Power-Down

N/A

Exit Power Down → Idle after 1 clock cycle

Maintain Power-Down

Deep Power-Down

N/A

Exit Deep Power-

Down → Exit Sequence

Maintain Deep Power-Down

All banks idle

Refer to Function Truth Table

Enter Power-down

Enter Power-Down

Enter Deep Power-Down

Self Refresh

ILLEGAL

Power-Down

Row Active

Refer to Function Truth Table

Enter Power down

ILLEGAL

Power-

Down → Row Active or Maintain PD

Any

state

other

than

listed above

Refer to Function Truth Table

Note:

1. Self refresh can enter only from the all banks idle state.

2. Power-down can enter only from the all banks idle or row active state.

3. Deep power-down can enter only from the all banks idle state.

Remark: H = High level, L = Low level, X = High or Low level (Don’t care), V = Valid data

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