
128Mb: x16, x32
MOBILE SDRAM
09005aef8071a76b
Micron Technology, Inc., reserves the right to change products or specifications without notice.
128Mbx16x32Mobile_2.fm - Rev. G (DRAFT) 7/04 EN
37
2001 Micron Technology, Inc. All rights reserved.
NOTE:
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 the all banks idle state once tXSR is met. COMMAND INHIBIT or
NOP commands should be issued on any clock edges occurring during the tXSR period. A minimum of two NOP com-
mands must be provided 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.
Table 9:
Truth Table – CKE
(Notes: 1-4)
CKEn-1
CKEn
CURRENT STATE
COMMANDn
ACTIONn
NOTES
L
Power-Down
X
Maintain Power-Down
Self Refresh
X
Maintain Self Refresh
Clock Suspend
X
Maintain Clock Suspend
L
H
Power-Down
COMMAND INHIBIT or NOP
Exit Power-Down
5
Self Refresh
COMMAND INHIBIT or NOP
Exit Self Refresh
6
Clock Suspend
X
Exit Clock Suspend
7
H
L
All Banks Idle
COMMAND INHIBIT or NOP
Power-Down Entry
All Banks Idle
AUTO REFRESH
Self Refresh Entry
Reading or Writing
VALID
Clock Suspend Entry
H