NT5SV64M4AT Datasheet, PDF (30/65 Pages) List of Unclassifed Manufacturers – 256Mb Synchronous DRAM

NT5SV64M4AT(L)
NT5SV32M8AT(L)
NT5SV16M16AT(L)
256Mb Synchronous DRAM
Clock Enable (CKE) Truth Table
CKE
Command
Current State _Previous
Cycle
Current
Cycle
CS
RAS CAS WE
BA0,
BA1
A 12 - A0
Action
Notes
H
X
X
X
X
X
X
X INVALID
1
L
H
H
X
X
X
X
X Exit Self Refresh with Device Deselect
2
L
H
L
H
H
H
X
X Exit Self Refresh with No Operation
2
Self Refresh
L
H
L
H
H
L
X
X ILLEGAL
2
L
H
L
H
L
X
X
X ILLEGAL
2
L
H
L
L
X
X
X
X ILLEGAL
2
L
L
X
X
X
X
X
X Maintain Self Refresh
H
X
X
X
X
X
X
X INVALID
1
L
Power Down
L
H
H
X
X
X
X
H
L
X
X
X
X
X Power Down mode exit, all banks idle
2
X ILLEGAL
2
L
L
X
X
X
X
X
X Maintain Power Down Mode
H
H
H
X
X
X
H
H
L
H
X
X
H
H
L
L
H
X
3
Refer to the Idle State section of the
Current State Truth Table
3
3
H
H
L
L
L
H
X
X CBR Refresh
H
H
L
L
L
L
OP Code
Mode Register Set
4
All Banks Idle
H
H
H
L
H
X
X
X
L
L
H
X
X
L
L
L
H
X
3
Refer to the Idle State section of the
Current State Truth Table
3
3
H
L
L
L
L
H
X
X Entry Self Refresh
4
H
L
L
L
L
L
OP Code
Mode Register Set
L
X
X
X
X
X
X
X Power Down
4
H
Any State
other than
H
listed above
L
H
X
X
X
X
X
L
X
X
X
X
X
H
X
X
X
X
X
X
Refer to operations in the Current State
Truth Table
X Begin Clock Suspend next cycle
5
X Exit Clock Suspend next cycle
L
L
X
X
X
X
X
X Maintain Clock Suspend
1. For the given Current State CKE must be low in the previous cycle.
2. When CKE has a low to high transition, the clock and other inputs are re-enabled asynchronously. The minimum setup time for CKE
(t _CES) must be satisfied. When exiting power down mode, a NOP command (or Device Deselect Command) is required on the first rising
clock after CKE goes high (see page 26).
3. The address inputs depend on the command that is issued. See the Idle State section of the Current State Truth Table for more informa-
tion.
4. The Precharge Power Down Mode, the Self Refresh Mode, and the Mode Register Set can only be entered from the all banks idle stat e.
5. Must be a legal command as defined in the Current State Truth Table.
REV 1.0
May, 2001
30
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