IS43LD16640C datasheet(27/142 Pages) ISSI

27 / 142 page

IS43/46LD16640C

IS43/46LD32320C

Integrated Silicon Solution, Inc. — www.issi.com

Rev. C

07/02/2021

® Long-term Support

World Class Quality

Current State Bank n – Command to Bank n Truth Table

Notes:

1. Values in this table apply when both CKEn -1 and CKEn are HIGH, and after tXSR or tXP has been met, if the previous state

was power-down.

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

3. Current state definitions:

Idle: The bank or banks have been precharged, and tRP has been met.

Active: A row in the bank has been activated, and tRCD has been met. No data bursts or accesses and no register acesses 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.

4. The states listed below must not be interrupted by a command issued to the same bank.

NOP commands or supported commands to the other bank must be issued on any clock edge occurring during these states. Sup-

ported commands to the other banks are determined by that bank’s current state, and the definitions given in Current State Bank

n to Command to Bank m Truth Table.

Precharge: Starts with registration of a PRECHARGE command and ends when tRP is met. After tRP is met, the bank is in the

idle state.

Row activate: Starts with registration of an ACTIVATE command and ends when tRCD is met. After tRCD is met, the bank is in

the active state.

READ with AP enabled: Starts with registration of a READ command with auto precharge enabled and ends when tRP is met.

After tRP is met, the bank is in the idle state.

WRITE with AP enabled: Starts with registration of a WRITE command with auto precharge enabled and ends when tRP is met.

After tRP is met, the bank is in the idle state.

5. The states listed below must not be interrupted by any executable command. NOP commands must be applied to each rising

clock edge during these states.

Current State Bank n – Command to Bank n

Current State

Notes

Any

7,8

9,15

10,11

10,11,12

10,11

10,11,14

Power On

7,9

Resetting

MRRRead value from Mode Register

Resetting MR Reading

Active

ResetBegin Device Auto-initializationResetting

Reading

Idle

Row Active

Reading

Writing

WriteSelect column, and start new write burstWriting

BST

Write burst terminate

MRW

MRR

Reset

Precharge

ACTIVATE

Refresh (Per Bank)Refreshing (Per Bank)

Refresh (All Bank)

Read value from Mode Register

Active / MR Reading

Deactivate row in bank or banksPrecharging

MRR

Precharge

Read

Select column, and start write burstWriting

Select column, and start new read burstReading

Refreshing (AllBank)

Begin to refresh

Load value from Mode Register

MR Writing

Select column, and start write burstWriting

Active

Write

BST

Read burst terminate

Read

Select column, and start read burst

Begin Device Auto-initializationResetting

Read value from Mode Register

Idle / MR Reading

Deactivate row in bank or banksPrecharging

Select column, and start read burstReading

Read

Write

Operation

Select and activate row

Begin to refresh

Command

NOP

Next State

Continue previous operationCurrent State

Active

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