W97AH6KB datasheet(78/127 Pages) WINBOND

78 / 127 page

W97AH6KB / W97AH2KB

Publication Release Date: May 15, 2014

Revision: A01-001

- 78 -

Refresh, Self-Refresh, and Mode Register Write commands may only be issued when all bank are idle.

A Burst Terminate (BST) command cannot be issued to another bank; it applies to the bank represented by the current state only.

The following states must not be interrupted by any executable command; NOP commands must be applied during each clock cycle while in

these states:

Idle MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has been met, the bank

will be in the Idle state.

Resetting MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has been met, the

bank will be in the Resetting state.

Active MR Reading: starts with the registration of a MRR command and ends when tMRR has been met. Once tMRR has been met, the

bank will be in the Active state.

MR Writing: starts with the registration of a MRW command and ends when tMRW has been met. Once tMRW has been met, the bank will

be in the Idle state.

tRRD must be met between Activate command to Bank n and a subsequent Activate command to Bank m.

Reads or Writes listed in the Command column include Reads and Writes with Auto Precharge enabled and Reads and Writes with Auto

Precharge disabled.

This command may or may not be bank specific. If all banks are being precharged, they must be in a valid state for pre- charging.

10. MRR is allowed during the Row Activating state (Row Activating starts with registration of an Activate command and ends when tRCD is met).

11. MRR is allowed during the Precharging state. (Precharging starts with registration of a Precharge command and ends when tRP is met.

12. Not bank-specific; requires that all banks are idle and no bursts are in progress.

13. The next state for Bank m depends on the current state of Bank m (Idle, Row Activating, Precharging, or Active). The reader shall note that

the state may be in transition when a MRR is issued. Therefore, if Bank m is in the Row Activating state and Precharging, the next state may

be Active and Precharge dependent upon tRCD and tRP respectively.

14. A Write command may be applied after the completion of the Read burst; otherwise a BST must be issued to end the Read prior to asserting a

Write command.

15. Read with auto precharge enabled or a Write with auto precharge enabled may be followed by any valid command to other banks provided

that the timing restrictions in 7.4.14.2

“Precharge & Auto Precharge Clarification” table are followed.

16. A Read command may be applied after the completion of the Write burst; otherwise, a BST must be issued to end the Write prior to asserting

a Read command.

17. Reset command is achieved through Mode Register Write command.

18. BST is allowed only if a Read or Write burst is ongoing.

7.5.5

Data Mask Truth Table

Name (Functional)

DQs

Note

Write enable

Valid

Write inhibit

Note:

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

W97AH6KB Datasheet(PDF) 78 Page - Winbond

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