IS42S32200B-7TI 查看數據表（PDF） - Integrated Silicon Solution

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IS42S32200B-7TI

512K Bits x 32 Bits x 4 Banks (64-MBIT) SYNCHRONOUS DYNAMIC RAM

Integrated Silicon Solution 

IS42S32200B

ISSI ®

TRUTH TABLE – CKE (1-4)

CURRENT STATE COMMANDn

ACTIONn

CKEn-1 CKEn

Power-Down

X

Maintain Power-Down

L

L

Self Refresh

X

Maintain Self Refresh

L

L

Clock Suspend

X

Maintain Clock Suspend

L

L

Power-Down(5)

COMMAND INHIBIT or NOP

Exit Power-Down

L

H

Self Refresh(6)

COMMAND INHIBIT or NOP

Exit Self Refresh

L

H

Clock Suspend(7)

X

Exit Clock Suspend

L

H

All Banks Idle

COMMAND INHIBIT or NOP

Power-Down Entry

H

L

All Banks Idle

AUTO REFRESH

Self Refresh Entry

H

L

Reading or Writing VALID

Clock Suspend Entry

H

L

See TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n

H

H

NOTES:

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 the SDRAM immediately prior to clock edge n.

3. COMMANDn is the command registered at clock edge n, and ACTONn is a result of COMMANDn.

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

5. Exiting power-down at clock edge n will put the device in the all banks idle state in time for clock edge n+1 (provided that tCKS is met).

6. Exiting self refresh at clock edge n will put the device in all banks idle state once tXSR is met. COMMAND INHIBIT or NOP commands

should be issued on clock edges occurring during the tXSR period. A minimum of two NOP commands must be sent during tXSR period.

7. After exiting clock suspend at clock edge n, the device will resume operation and recognize the next command at clock edge n+1.

TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n (1-6)

CURRENT STATE

Any

Idle

Row Active

Read

(Auto

Precharge

Disabled)

Write

(Auto

Precharge

Disabled)

COMMAND (ACTION)

COMMAND INHIBIT (NOP/Continue previous operation)

NO OPERATION (NOP/Continue previous operation)

ACTIVE (Select and activate row)

AUTO REFRESH(7)

LOAD MODE REGISTER(7)

PRECHARGE(11)

READ (Select column and start READ burst)(10)

WRITE (Select column and start WRITE burst)(10)

PRECHARGE (Deactivate row in bank or banks)(8)

READ (Select column and start new READ burst)(10)

WRITE (Select column and start WRITE burst)(10)

PRECHARGE (Truncate READ burst, start PRECHARGE)(8)

BURST TERMINATE(9)

READ (Select column and start READ burst)(10)

WRITE (Select column and start new WRITE burst)(10)

PRECHARGE (Truncate WRITE burst, start PRECHARGE)(8)

BURST TERMINATE(9)

CS RAS CAS WE

HX XX

LH HH

L L HH

LL LH

LL LL

LL HL

LH LH

LH LL

LL HL

LH LH

LH LL

LL HL

LH HL

LH LH

LH LL

LL HL

LH HL

Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774

7

Rev. 00C

09/29/03

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