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K4S641632H Datasheet(PDF) 14 Page - Samsung semiconductor

Part # K4S641632H
Description  64Mb H-die SDRAM Specification 54 TSOP-II with Pb-Free (RoHS compliant)
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Manufacturer  SAMSUNG [Samsung semiconductor]
Direct Link  http://www.samsung.com/Products/Semiconductor
Logo SAMSUNG - Samsung semiconductor

K4S641632H Datasheet(HTML) 14 Page - Samsung semiconductor

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SDRAM 64Mb H-die (x4, x8, x16)
CMOS SDRAM
Rev. 1.3 August 2004
SIMPLIFIED TRUTH TABLE
(V=Valid, X=Don
′t care, H=Logic high, L=Logic low)
Command
CKEn-1
CKEn
CS
RAS
CAS
WE
DQM
BA0,1
A10/AP
A11,
A9 ~ A0
Note
Register
Mode register set
H
X
L
L
L
L
X
OP code
1,2
Refresh
Auto refresh
H
H
LL
LHX
X
3
Self
refresh
Entry
L
3
Exit
L
H
LH
HH
XX
3
HX
X
X
3
Bank active & row addr.
H
X
L
L
H
H
X
V
Row address
Read &
column address
Auto precharge disable
HX
L
H
L
H
X
V
L
Column
address
4
Auto precharge enable
H
4,5
Write &
column address
Auto precharge disable
HX
L
H
L
L
X
V
L
Column
address
4
Auto precharge enable
H
4,5
Burst stop
H
X
L
H
H
L
X
X
6
Precharge
Bank selection
HX
L
L
H
L
X
VL
X
All banks
XH
Clock suspend or
active power down
Entry
H
L
HX
X
X
X
X
LV
V
V
Exit
L
H
X
X
X
X
X
Precharge power down mode
Entry
H
L
HX
X
X
X
X
LH
HH
Exit
L
H
HX
X
X
X
LV
V
V
DQM
H
X
V
X
7
No operation command
H
X
HX
X
X
XX
LH
HH
1. OP Code : Operand code
A0 ~ A11 & BA0 ~ BA1 : Program keys. (@ MRS)
2. MRS can be issued only at all banks precharge state.
A new command can be issued after 2 CLK cycles of MRS.
3. Auto refresh functions are as same as CBR refresh of DRAM.
The automatical precharge without row precharge command is meant by "Auto".
Auto/self refresh can be issued only at all banks precharge state.
4. BA0 ~ BA1 : Bank select addresses.
If both BA0 and BA1 are "Low" at read, write, row active and precharge, bank A is selected.
If both BA0 is "Low" and BA1 is "High" at read, write, row active and precharge, bank B is selected.
If both BA0 is "High" and BA1 is "Low" at read, write, row active and precharge, bank C is selected.
If both BA0 and BA1 are "High" at read, write, row active and precharge, bank D is selected.
If A10/AP is "High" at row precharge, BA0 and BA1 is ignored and all banks are selected.
5. During burst read or write with auto precharge, new read/write command can not be issued.
Another bank read/write command can be issued after the end of burst.
New row active of the associated bank can be issued at tRP after the end of burst.
6. Burst stop command is valid at every burst length.
7. DQM sampled at positive going edge of a CLK and masks the data-in at the very CLK (Write DQM latency is 0),
but makes Hi-Z state the data-out of 2 CLK cycles after. (Read DQM latency is 2)
Notes :


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