K4C561638C-TCD4000 Datasheet, PDF (21/42 Pages) Samsung semiconductor – 256Mb Network-DRAM

K4C5608/1638C
256Mb Network-DRAM
Function Truth Table (Continued)
Auto-Refresh Command Table
Function
Active
Auto-Refresh
Command
(Symbol)
Current
State
PD
n-1 n
CS
FN BA1-BA0 A14-A9 A8
A7 A6-A0 Notes
WRA(1st) Standby H H
L
L
X
X
X
X
X
REF(2nd) Active
HH
L
X
X
X
X
X
X
Self-Refresh Command Table
Function
Command
(Symbol)
Active
Self-Refresh Entry
Self-Refresh Continue
Self-Refresh Exit
WRA(1st)
REF(2nd)
-
SELFX
Current
State
Standby
Active
Self-Refresh
Self-Refresh
PD
CS FN BA1-BA0 A14-A9 A8 A7 A6-A0 Notes
n-1 n
HH L L
X
X XX X
HL L X
X
X
X X X 9, 10
LL X X
X
X
XX X
LH H X
X
X XX X
11
Power Down Table
Function
Command
(Symbol)
Power Down Entry
Power Down Continue
Power Down Exit
PDEN
-
PDEX
Current
State
Standby
Power Down
Power Down
PD
CS FN BA1-BA0 A14-A9 A8 A7 A6-A0 Notes
n-1 n
HL H X
X
X
X X X 10
LL X X
X
X
XX X
LH H X
X
X
XX
X 11
Notes : 9. PD has to be brought to Low within t_FPDL from REF command.
10. PD should be brought to Low after DQ’s state turned high impedance.
11. When PD is brought to High from Low, this function is executed asynchronously.
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REV. 0.7 Aug. 2003