K4C561638C-TCD4000 Datasheet, PDF (22/42 Pages) Samsung semiconductor – 256Mb Network-DRAM

K4C5608/1638C
256Mb Network-DRAM
Function Truth Table (Continued)
Current State
PD
CS
FN Address Command
n-1 n
Action
H
H
H
X
X
DESL NOP
H
H
L
H
BA, UA
RDA
Row activate for Read
H
H
L
L
BA, UA
WRA
Row activate for Write
Idle
H
L
H
X
X
PDEN Power Down Entry
H
L
L
X
X
-
Illegal
L
X
X
X
X
-
Refer to Power Down state
H
H
H
X
LA
LAL
Begin read
H
H
L
X Op-Code MRS/EMRS Access to Mode Register
Row Active for Read
H
L
H
X
X
PDEN Illegal
H
L
L
X
X
REF (Self) Illegal
L
X
X
X
X
-
Invalid
H
H
H
X
LA
LAL
Begin Write
H
H
L
X
X
REF
Auto-Refresh
Row Active for Write
H
L
H
X
X
PDEN Illegal
H
L
L
X
X
REF (Self) Self-Refresh entry
L
X
X
X
X
-
Invalid
H
H
H
X
X
DESL Continue burst read to end
H
H
L
H
BA, UA
RDA
Illegal
Read
H
H
L
H
L
H
L
BA, UA
X
X
WRA
PDEN
Illegal
Illegal
H
L
L
X
X
-
Illegal
L
X
X
X
X
-
Invalid
H
H
H
X
X
DESL Data write & continue burst write to end
H
H
L
H
BA, UA
RDA
Illegal
Write
H
H
L
H
L
H
L
BA, UA
X
X
WRA
PDEN
Illegal
Illegal
H
L
L
X
X
-
Illegal
L
X
X
X
X
-
Invalid
H
H
H
X
X
DESL
NOP-> Idle after I_REFC
H
H
L
H
BA, UA
RDA
Illegal
Auto-Refreshing
H
H
L
H
L
H
L
BA, UA
X
X
WRA
PDEN
Illegal
Self-Refresh entry
H
L
L
X
X
-
Illegal
L
X
X
X
X
-
Refer to Self-Refreshing state
H
H
H
X
X
DESL
Nop-> Idle after I_RSC
H
H
L
H
BA, UA
RDA
Illegal
H
H
L
Mode Register Accessing
H
L
H
L
BA, UA
X
X
WRA
PDEN
Illegal
Illegal
H
L
L
X
X
-
Illegal
L
X
X
X
X
-
Invalid
H
X
X
X
X
-
Invalid
Power Down
L
L
X
X
X
L
H
H
X
X
-
RDEX
Maintain Power Down Mode
Exit Power Down Mode->Idle after t_PDEX
L
H
L
X
X
-
Illegal
H
X
X
X
X
-
Invalid
Se;f-Refreshing
L
L
X
X
X
-
Maintain Self-Refresh
L
H
H
X
X
SELFX Exit Self-Refresh->Idle after I_REFC
L
H
L
X
X
-
Illegal
Notes
12
13
13
13
13
14
Notes : 12. Illegal if any bank is not idle.
13. Illegal to bank in specified states : Function may be Legal in the bank indicated by bank Address (BA).
14. Illegal if t_FPDL is not satisfied.
- 22 -
REV. 0.7 Aug. 2003