IS42S16400F View Datasheet(PDF) - Integrated Silicon Solution
Part Name
Description
Manufacturer
IS42S16400F
Integrated Silicon Solution
IS42S16400F Datasheet PDF : 58 Pages
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IS42S16400F
IS45S16400F
TRUTH TABLE – CKE (1-4)
CURRENT STATE COMMANDn
Power-Down
X
Self Refresh
X
Clock Suspend
X
Power-Down(5)
COMMAND INHIBIT or NOP
Self Refresh(6)
COMMAND INHIBIT or NOP
Clock Suspend(7)
X
All Banks Idle
COMMAND INHIBIT or NOP
All Banks Idle
AUTO REFRESH
Reading or Writing VALID
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
CKEn-1
L
L
L
L
L
L
H
H
H
CKEn
L
L
L
H
H
H
L
L
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 COMMAND (ACTION)
CS RAS CAS WE
Any
COMMAND INHIBIT (NOP/Continue previous operation)
HX XX
NO OPERATION (NOP/Continue previous operation)
LH HH
Idle
ACTIVE (Select and activate row)
L L HH
AUTO REFRESH(7)
LL LH
LOAD MODE REGISTER(7)
LL LL
PRECHARGE(11)
LL HL
Row Active
READ (Select column and start READ burst)(10)
LH LH
WRITE (Select column and start WRITE burst)(10)
LH LL
PRECHARGE (Deactivate row in bank or banks)(8)
LL HL
Read
READ (Select column and start new READ burst)(10)
LH LH
(Auto
WRITE (Select column and start WRITE burst)(10)
LH LL
Precharge
PRECHARGE (Truncate READ burst, start PRECHARGE)(8)
LL HL
Disabled)
BURST TERMINATE(9)
LH HL
Write
READ (Select column and start READ burst)(10)
LH LH
(Auto
WRITE (Select column and start new WRITE burst)(10)
LH LL
Precharge
PRECHARGE (Truncate WRITE burst, start PRECHARGE)(8)
LL HL
Disabled)
BURST TERMINATE(9)
LH HL
NOTE:
1. This table applies when CKE n-1 was HIGH and CKE n is HIGH (see Truth Table - CKE) and after txsr has been met (if the
previous state was self refresh).
2. This table is bank-specific, except where noted; i.e., the current state is for a specific bank and the commands shown are those
allowed to be issued to that bank when in that state. Exceptions are covered in the notes below.
Integrated Silicon Solution, Inc. — www.issi.com
9
Rev. F
11/09/09
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