K4C561638C-TCD4000 Datasheet, PDF (19/42 Pages) Samsung semiconductor – 256Mb Network-DRAM

K4C5608/1638C
256Mb Network-DRAM
Function Truth Table (Notes : 1,2,3)
Command Truth Table (Notes : 4)
•The First Command
Symbol
Function
DESL Device Deselect
RDA Read with Auto-close
WRA Write with Auto-close
CS
FN
BA1-BA0 A14-A9
A8
A7
A6-A0
H
X
X
X
X
X
X
L
H
BA
UA
UA
UA
UA
L
L
BA
UA
UA
UA
UA
•The Second Command (The next clock of RDA or WRA command)
Symbol
Function
LAL Lower Address Latch (x16)
LAL Lower Address Latch (x8)
REF Auto-Refresh
MRS Mode Register Set
CS FN BA1-BA0 A14-A13 A12-A11 A10-A9 A8 A7 A6-A0
H
X
X
V
V
X
X X LA
H
X
X
V
X
X
X LA LA
L
X
X
X
X
X
XX
X
L
X
V
L
L
L
LV
V
Notes : 1. L = Logic Low, H = Logic High, X = either L or H, V = Valid (Specified Value), BA = Bank Address, UA = Upper Address,
LA = Lower Address.
2. All commands are assumed to issue at a valid state.
3. All inputs for command (excluding SELFX and PDEX) are latched on the crossing point of differential clock input where
CLK goes to High.
4. Operation mode is decided by the comination of 1st command and 2nd command refer to "STATE DIAGRAM" and the
command table below.
Read Command Table
Command (Symbol)
CS
RDA (1st)
L
LAL (2nd)
H
Notes : 5. For x16 device, A7 is "X" (either L or H).
FN BA1-BA0 A14-A9
A8
H
BA
UA
UA
X
X
X
X
A7 A6-A0 Notes
UA
UA
LA
LA
5
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REV. 0.7 Aug. 2003