is42s16400b1 Integrated Silicon Solution, Inc., is42s16400b1 Datasheet - Page 7

• Manufacturer Part Number: is42s16400b1
• Description: 1 Meg Bits X 16 Bits X 4 Banks 64-mbit Synchronous Dynamic Ram - Integrated Silicon Solution, Inc
• Manufacturer: Integrated Silicon Solution, Inc.

IS42S16400B1
TRUTH TABLE – CKE
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 ACTIONn 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 t
6. Exiting self refresh at clock edge n will put the device in all banks idle state once t
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
Integrated Silicon Solution, Inc. — www.issi.com —
Rev. A
12/09/03
CURRENT STATE
Power-Down
Self Refresh
Clock Suspend
Power-Down
Self Refresh
Clock Suspend
All Banks Idle
All Banks Idle
Reading or Writing
should be issued on clock edges occurring during the t
CURRENT STATE
Any
Idle
Row Active
Read
(Auto
Precharge
Disabled)
Write
(Auto
Precharge
Disabled)
(6)
(5)
(7)
BURST TERMINATE
BURST TERMINATE
COMMAND (ACTION)
COMMAND INHIBIT (NOP/Continue previous operation)
NO OPERATION (NOP/Continue previous operation)
ACTIVE (Select and activate row)
LOAD MODE REGISTER
PRECHARGE
READ (Select column and start READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE (Deactivate row in bank or banks)
READ (Select column and start new READ burst)
WRITE (Select column and start WRITE burst)
PRECHARGE (Truncate READ burst, start PRECHARGE)
READ (Select column and start READ burst)
WRITE (Select column and start new WRITE burst)
PRECHARGE (Truncate WRITE burst, start PRECHARGE)
AUTO REFRESH
COMMANDn
X
X
X
COMMAND INHIBIT or NOP
COMMAND INHIBIT or NOP
X
COMMAND INHIBIT or NOP
AUTO REFRESH
VALID
See TRUTH TABLE – CURRENT STATE BANK n, COMMAND TO BANK n
(1-4)
(11)
(7)
(9)
(9)
(7)
XSR
period. A minimum of two NOP commands must be sent during t
1-800-379-4774
ACTIONn
Maintain Power-Down
Maintain Self Refresh
Maintain Clock Suspend
Exit Power-Down
Exit Self Refresh
Exit Clock Suspend
Power-Down Entry
Self Refresh Entry
Clock Suspend Entry
(10)
(10)
(10)
(10)
(8)
XSR
(10)
(10)
is met. COMMAND INHIBIT or NOP commands
(8)
(8)
(1-6)
CS RAS CAS WE
CKEn-1
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
H
H
L
L
L
L
L
L
X
H
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
ISSI
CKS
H
H
H
H
H
H
H
H
X
L
L
L
L
L
L
L
L
CKEn
XSR
is met).
H
H
H
H
L
L
L
L
L
L
period.
X
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
L
®
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