AS4C64M32MD2-25BCN datasheet(73/129 Pages) ALSC

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Table 17 — Current State Bank n - Command to Bank m

Current State

Bank n

Command for

Bank m

Operation

Next State for

Bank m

Notes

Any

NOP

Continue previous operation

Current State of Bank m

Idle

Any

Any command allowed to Bank m

Row Activating,

Active, or

Precharging

Active

Select and activate row in Bank m

Active

Read

Select column, and start read burst from Bank m

Reading

Write

Select column, and start write burst to Bank m

Writing

Precharge

Deactivate row in bank or banks

Precharging

MRR

Read value from Mode Register

Idle MR Reading or

Active MR Reading

10,11,13

BST

Read or Write burst terminate an ongoing

Read/Write from/to Bank m

Active

Reading

(Autoprecharge

disabled)

Read

Select column, and start read burst from Bank m

Reading

Write

Select column, and start write burst to Bank m

Writing

8, 14

Activate

Select and activate row in Bank m

Active

Precharge

Deactivate row in bank or banks

Precharging

Writing

(Autoprecharge

disabled)

Read

Select column, and start read burst from Bank m

Reading

8,16

Write

Select column, and start write burst to Bank m

Writing

Activate

Select and activate row in Bank m

Active

Precharge

Deactivate row in bank or banks

Precharging

Reading with

Autoprecharge

Read

Select column, and start read burst from Bank m

Reading

8,15

Write

Select column, and start write burst to Bank m

Writing

8,14,15

Activate

Select and activate row in Bank m

Active

Precharge

Deactivate row in bank or banks

Precharging

Writing with

Autoprecharge

Read

Select column, and start read burst from Bank m

Reading

8,15,16

Write

Select column, and start write burst to Bank m

Writing

8,15

Activate

Select and activate row in Bank m

Active

Precharge

Deactivate row in bank or banks

Precharging

Power On

Reset

Begin Device Auto-Initialization

Resetting

12,17

Resetting

MRR

Read value from Mode Register

Resetting MR Reading

NOTE 1 The table applies when both CKEn-1 and CKEn are HIGH, and after tXSR or tXP has been met if the previous state was Self Refresh or

Power Down.

NOTE 2 All states and sequences not shown are illegal or reserved.

NOTE 3 Current State Definitions:

Idle: the bank has been precharged, and tRP has been met.

Active: a row in the bank has been activated, and tRCD has been met. No data bursts/accesses and no register accesses are in

progress.

Reading: a Read burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

Writing: a Write burst has been initiated, with Auto Precharge disabled, and has not yet terminated or been terminated.

NOTE 4 Refresh, Self-Refresh, and Mode Register Write commands may only be issued when all bank are idle.

NOTE 5 A Burst Terminate (BST) command cannot be issued to another bank; it applies to the bank represented by the current state only.

NOTE 6 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.

NOTE 7 tRRD must be met between Activate command to Bank n and a subsequent Activate command to Bank m.

NOTE 8 Reads or Writes listed in the Command column include Reads and Writes with Auto Precharge enabled and Reads and Writes with

Auto Precharge disabled.

NOTE 9 This command may or may not be bank specific. If all banks are being precharged, they must be in a valid state for precharging.

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

tRCD is met.)

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

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

NOTE 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.

NOTE 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

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