IS42S16400B1 View Datasheet(PDF) - Integrated Silicon Solution
Part Name
Description
Manufacturer
IS42S16400B1
Integrated Silicon Solution
IS42S16400B1 Datasheet PDF : 55 Pages
| |||
IS42S16400B1
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 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 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. A
12/09/03
Share Link: