W949D6KB datasheet(20/60 Pages) WINBOND

20 / 60 page

W949D6KB / W949D2KB

Publication Release Date: Dec. 11, 2014

Revision: A01-002

- 20 -

7.6

Commands

All commands (address and control signals) are registered on the positive edge of clock (crossing of

CK going high and CK going low).

7.6.1

Basic Timing Parameters for Commands

Input

Valid

tCL

tCH

tCK

tIS tIH

= Don't Care

NOTE: Input = A0–An, BA, CKE, CS, RAS, CAS, WE

7.6.2

Truth Table

– Commands

NAME (FUNCTION)

RAS CAS

A10/AP ADDR NOTES

DESELECT (NOP)

NO OPERATION (NOP)

ACTIVE (Select Bank and activate row)

Valid

Row

READ (Select bank and column and start read burst)

Valid

Col

READ with AP (Read Burst with Auto Precharge)

Valid

Col

WRITE (Select bank and column and start write burst)

Valid

Col

WRITE with AP (Write Burst with Auto Precharge)

Valid

Col

BURST TERMINATE

4, 5

PRECHARGE (Deactivate row in selected bank)

Valid

PRECHARGE ALL (Deactivate rows in all banks)

AUTO REFRESH or enter SELF REFRESH

7, 8, 9

MODE REGISTER SET

Valid

Op-code

Notes:

All states and sequences not shown are illegal or reserved.

DESELECT and NOP are functionally interchangeable.

Auto precharge is non-persistent. A10 High enables Auto precharge, while A10 Low disables Auto precharge.

Burst Terminate applies to only Read bursts with Auto precharge disabled. This command is undefined and should not be used

for Read with Auto precharge enabled, and for Write bursts.

This command is BURST TERMINATE if CKE is High and DEEP POWER DOWN entry if CKE is Low.

If A10 is low, bank address determines which bank is to be precharged. If A10 is high, all banks are precharged and BA0~BA1

are don’t care.

This command is AUTO REFRESH if CKE is High and SELF REFRESH if CKE is low.

All address inputs and I/O are ‘don’t care’ except for CKE. Internal refresh counters control bank and row addressing.

All banks must be precharged before issuing an AUTO-REFRESH or SELF REFRESH command.

10. BA0 and BA1 value select between MRS and EMRS.

11. CKE is HIGH for all commands shown except SELF REFRESH and DEEP POWER-DOWN.

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