19

Rev. 0A | October 2022

www.issi.com - dram@issi.com

IS43/46LR32320C

IS43/46LR16640C

Note:

1. CKEn is the logic state of CKE at clock edge

n; CKEn-1 was the state of CKE at the previous clock edge.

2. Current state is the state of Mobile DDR immediately prior to clock edge

n.

3. COMMANDn is the command registered at clock edge n, and ACTION

n is the result of COMMANDn.

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

5. DESELECT and NOP are functionally interchangeable.

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

7. SELF REFRESH exit time (tXSR) should elapse before a command other than NOP or DESELECT is issued.

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

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

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

See the other Truth Tables

H

H

Enter Deep Power

Down

BURST TERMINATE

All Banks Idle

L

H

Self Refresh Entry

AUTO REFRESH

All Banks Idle

L

H

5

Active Power Down

Entry

NOP or DESELECT

Bank(s) Active

L

H

5

Precharge Power

Down entry

NOP or DESELECT

All Banks Idle

L

H

5,8

Exit Deep Power Down

NOP or DESELECT

Deep Power Down

H

L

5,7,10

Exit Self Refresh

NOP or DESELECT

Self Refresh

H

L

5,6,9

Exit Power Down

NOP or DESELECT

Power Down

H

L

Maintain Deep Power Down

X

Deep Power Down

L

L

Maintain Self Refresh

X

Self Refresh

L

L

Maintain Power Down

X

Power Down

L

L

Note

ACTION

n

COMMAND

n

Current State

CKEn

CKEn-1

Table6 : CKE Truth Table