W949D6KB datasheet(21/60 Pages) WINBOND

21 / 60 page

W949D6KB / W949D2KB

Publication Release Date: Dec. 11, 2014

Revision: A01-002

- 21 -

7.6.3

Truth Table - DM Operations

FUNCTION

NOTES

Write Enable

Valid

Write Inhibit

Note:

Used to mask write data, provided coincident with the corresponding data.

7.6.4

Truth Table

– CKE

CKEn-1

CKEn

CURRENT STATE

COMMAND n

ACTION n

NOTES

Power Down

Maintain Power Down

Self Refresh

Maintain Self Refresh

Deep Power Down

Maintain Deep Power Down

Power Down

NOP or DESELECT

Exit Power Down

5, 6, 9

Self Refresh

NOP or DESELECT

Exit Self Refresh

5, 7, 10

Deep Power Down

NOP or DESELECT

Exit Deep Power Down

5, 8

All Banks Idle

NOP or DESELECT

Precharge Power Down Entry

Bank(s) Active

NOP or DESELECT

Active Power Down Entry

All Banks Idle

AUTO REFRESH

Self Refresh Entry

All Banks Idle

BURST TERMINATE

Enter Deep Power Down

See the other Truth Tables

Notes:

CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.

Current state is the state of LPDDR immediately prior to clock edge n.

COMMAND n is the command registered at clock edge n, and ACTION n is the result of COMMAND n.

All states and sequences not shown are illegal or reserved.

DESELECT and NOP are functionally interchangeable.

Power Down exit time (tXP) should elapse before a command other than NOP or DESELECT is issued.

SELF REFRESH exit time (tXSR) should elapse before a command other than NOP or DESELECT is issued.

The Deep Power-Down exit procedure must be followed as discussed in the Deep Power-Down section of the Functional

Description.

The clock must toggle at least once during the tXP period.

10. The clock must toggle at least once during the tXSR time.

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