W97AH6KB datasheet(76/127 Pages) WINBOND

76 / 127 page

W97AH6KB / W97AH2KB

Publication Release Date: May 15, 2014

Revision: A01-001

- 76 -

The following states must not be interrupted by any executable command; NOP commands must be applied to each positive clock edge

during these states.

Refreshing (Per Bank): starts with registration of a Refresh (Per Bank) command and ends when tRFCpb is met. Once tRFCpb is met, the

bank w

ill be in an ‘idle’ state.

Refreshing (All Bank): starts with registration of a Refresh (All Bank) command and ends when tRFCab is met. Once tRFCab is met, the

device will be in an ‘all banks idle’ state.

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.

Precharging All: starts with the registration of a Precharge-All command and ends when tRP is met. Once tRP is met, the bank will be in the

idle state.

Bank-specific; requires that the bank is idle and no bursts are in progress.

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

Not bank-specific reset command is achieved through Mode Register Write command.

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. A command other than NOP should not be issued to the same bank while a Read or Write burst with Auto Precharge is enabled.

11. The new Read or Write command could be Auto Precharge enabled or Auto Precharge disabled.

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

Write command.

13. Not bank-specific. Burst Terminate (BST) command affects the most recent read/write burst started by the most recent Read/Write command,

regardless of bank.

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

Read command.

15. If a Precharge command is issued to a bank in the Idle state, tRP shall still apply.

W97AH6KB Datasheet(PDF) 76 Page - Winbond