N16D1633LPA
Advance Information
NanoAmp Solutions, Inc.
Table 4: Command Truth Table
COMMAND
CKEn-1
CKEn
CS
RAS
CAS
WE
DQM
ADDR
A10
Note
Command Inhibit (NOP)
No Operation (NOP)
Mode Register Set
H
H
H
H
X
X
X
X
H
L
L
L
X
H
L
X
H
L
X
H
L
X
X
X
X
X
X
OP-CODE
OP-CODE
4
4
Extended Mode Register Set
L
L
L
Active (select bank and activate
row)
H
X
L
L
H
H
X
Bank/Row
Read
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
H
H
L
L
L
L
L
L
L
L
L
L
H
L
H
L
H
L
H
L
H
H
H
H
L
L
H
L
L
L
L
H
H
L
L
L
L/H
L/H
L/H
L/H
X
X
X
X
X
Bank/Col
L
H
L
H
H
L
5
5
5
5
Read with Autoprecharge
Write
Write with Autoprecharge
Precharge All Banks
Precharge Selected Bank
Burst stop
Bank/Col
Bank/Col
Bank/Col
X
L
H
H
H
L
L
L
Bank
X
X
X
Auto Refresh
Self Refresh Entry
H
H
X
H
X
H
X
H
X
V
3
3
L
L
X
H
X
H
X
H
X
V
X
H
X
H
X
H
X
V
Self Refresh Exit
L
H
L
H
L
X
X
X
X
X
X
X
X
2
Precharge Power Down Entry
Precharge Down Exit
Clock Suspend Entry
H
L
H
Clock Suspend Exit
Deep Power Down Entry
Deep Power Down Exit
L
H
L
H
L
H
X
X
X
X
X
X
X
X
L
H
H
L
6
Note :
1. CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previoys clock edge.
H: High Level, L: Low Level, X: Don't Care, V: Valid
2. Exiting Self Refresh occurs by asynchronously bringing CKE from low to high and will put the device in the all banks idle state once
tXSR is met. Command Inhibit or NOP commands should be issued on any clock edges occuring during the tXSR period. A mimum
of two NOP commands must be provided during tXSR period.
3. During refresh operation, internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE.
4. A0-A10 define OP CODE written to the mode register, and BA must be issued 0 in the mode register set, and 1 in the extended
mode register set.
5. DQM “L” means the data Write/Ouput Enable and “H” means the Write inhibit/Output High-Z. Write DQM Latency is 0 CLK and
Read DQM Latency is 2 CLK.
6. Standard SDRAM parts assign this command sequence as Burst Terminate. For Bat Ram parts, the Burst Terminate command is
assigned to the Deep Power Down function.
Stock No. 23395- Rev I 5/05
12
The specifications of this device are subject to change without notice. For latest documentation see http://www.nanoamp.com.
NANOAMP [ NANOAMP SOLUTIONS, INC. ]
