18

Rev. 0A | October 2022

www.issi.com - dram@issi.com

IS43/46LR32320C

IS43/46LR16640C

Note:

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

2. DESLECT and NOP are functionally interchangeable.

3. Autoprecharge is non-persistent. A10 High enables Autoprecharge, while A10 Low disables Autoprecharge

4. Burst Terminate applies to only Read bursts with autoprecharge disabled.

This command is undefined and should not be used for Read with Autoprecharge enabled, and for Write bursts.

5. This command is BURST TERMINATE if CKE is High and DEEP POWER DOWN entry if CKE is Low.

6. If A10 is low, bank address determines which bank is to be precharged. If A10 is high, all banks are precharged and BA0-BA1 are don‘t

care.

7. This command is AUTO REFRESH if CKE is High, and SELF REFRESH if CKE is low.

8. All address inputs and I/O are ''don't care'' except for CKE. Internal refresh counters control Bank and Row addressing.

9. All banks must be precharged before issuing an AUTO-REFRESH or SELF REFRESH command.

10. BA0 and BA1 value select among Mode Register (MRS) or Extended Mode Register (EMRS).

11. Used to mask write data, provided coincident with the corresponding data.

12. CKE is HIGH for all commands shown except SELF REFRESH and DEEP POWER-DOWN.

Function

/CS

/RAS

/CAS

/WE

BA

A10/AP

ADDR

Note

DESELECT (NOP)

H

X

X

X

X

X

X

2

NO OPERATION (NOP)

L

H

H

H

X

X

X

2

ACTIVE (Select Bank and activate Row)

L

L

H

H

V

Row

Row

READ (Select bank and column and start read burst)

L

H

L

H

V

L

Col

READ with AP (Read Burst with Auto recharge)

L

H

L

H

V

H

Col

3

WRITE (Select bank and column and start write burst)

L

H

L

L

V

L

Col

WRITE with AP (Write Burst with Auto recharge)

L

H

L

L

V

H

Col

3

BURST TERMINATE or enter DEEP POWER DOWN

L

H

H

L

X

X

X

4,5

PRECHARGE (Deactivate Row in selected bank)

L

L

H

L

V

L

X

6

PRECHARGE ALL (Deactivate rows in all banks)

L

L

H

L

X

H

X

6

AUTO REFRESH or enter SELF REFRESH

L

L

L

H

X

X

X

7,8,9

MODE REGISTER SET

L

L

L

L

V

Op_Code

10

Function

DM

DQ

Note

Write Enable

L

Valid

11

Write Inhibit

H

X

11

Table5 : DM Truth Table

Table4: Command Truth Table