IS43LD16640C datasheet(26/142 Pages) ISSI

26 / 142 page

IS43/46LD16640C

IS43/46LD32320C

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

Rev. C

07/02/2021

® Long-term Support

World Class Quality

CKE Truth Table

Device

Current State*3

CKEn-1*1 CKEn*1 CS#

Notes

6,9

6,9,12

7,10

Bank(s) Active

Resetting

Other states

Device Next State

Idle

Power Down

NOP

Maintain Active Power Down

Exit Active Power Down

Active Power Down

Active

Idle Power Down

Idle

Resetting

Power Down

Active

Power Down

Command n*4

Operation n*4

xMaintain Idle Power Down

xMaintain Resertting Power Down

Maintain Deep Power Down

Deep Power Down

xMaintain Self Refresh

Self Refresh

NOPExit Self Refresh

Idle

NOPEnter Resetting Power Down

Resetting Power Down

Refer to the Command Truth Table

Deep

Power Down

NOPExit Deep Power Down

Power On

Resetting Power Down

NOPExit Idle Power Down

NOPExit Resetting Power Down

Idle or Resetting

NOPEnter Active Power Down

Active Power Down

Enter

Self-Refresh

Enter Deep Power Down

Deep Power Down

All Banks Idle

NOPEnter Idle Power Down

Idle Power Down

Enter

Self-Refresh

Enter Self Refresh

Self Refresh

Notes:

1.“CKEn” is the logic state of CKE at clock edge n; “CKEn-1” was the logic state of CKE at previous clock edge.

2. “CS#” is the logic state of CS# at the clock rising edge n;

3. “Current state” is the state of the LPDDR2 device immediately prior to clock edge n.

4. “Command n” is the command registered at clock edge N, and “Operation n” is a result of “Command n”.

5. All states and sequences not shown are illegal or reserved unless explicitly described elsewhere in this document.

6. Power Down exit time (tXP) should elapse before a command other than NOP is issued.

7. Self-Refresh exit time (tXSR) should elapse before a command other than NOP is issued.

8. The Deep Power- Down exit procedure must be followed as discussed in the DPD section of the Functional Description.

9. The clock must toggle at least once during the tXP period.

10. The clock must toggle at least once during the tXSR period.

11. “x” means “Don’t care”.

12. Upon exiting Resetting Power Down, the device will return to the idle state if tINIT5 has expired.

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