K4H281638B-TCB0000 Samsung Semiconductor, K4H281638B-TCB0000 Datasheet - Page 31
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K4H281638B-TCB0000
Manufacturer Part Number
K4H281638B-TCB0000
Description
Manufacturer
Samsung Semiconductor
Datasheet
1.K4H281638B-TCB0000.pdf
(55 pages)
Specifications of K4H281638B-TCB0000
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128Mb DDR SDRAM
When the Read with Auto precharge command is issued, new command can be asserted at 3,4 and 5
respectively as follows,
operation BL/2 clock later from a read with auto-precharge command when tRAS(min) is satisfied. If not, the
start point of precharge operation will be delayed until tRAS(min) is satisfied. Once the precharge operation
has started the bank cannot be reactivated and the new command can not be asserted until the precharge
time(tRP) has been satisfied.
3.3.11 Read With Auto Precharge
CAS Latency=2
CAS Latency=2.5
If a read with auto-precharge command is initiated, the DDR SDRAM automatically enters the precharge
*1
READ+AP
Precharge
command
Asserted
: AP = Auto Precharge
READ
Active
< Burst Length=4, CAS Latency= 2, 2.5>
Command
DQS
DQ s
D Q S
DQ s
CK
CK
No AP
READ +
READ +
Illegal
Legal
AP
BANK A
ACTIVE
3
Table 6. Operating description when new command asserted
*1
0
For same Bank
Figure 19. Read with auto precharge timing
while read with auto precharge is issued
NOP
READ +
READ+
No AP
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1
AP
4
t
RAS(min.)
Auto Precharge
READ A
Begin Auto-Precharge
2
- 31 -
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5
NOP
3
NOP
Dout 0 Dout 1 Dout 2 Dout 3
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4
3
Dout 0 Dout 1 Dout 2 Dout 3
t
RP
NOP
For Different Bank
5
REV. 1.31 Nov. 3. 2001
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NOP
4
* Bank can be reactivated at the
completion of
6
NOP
precharge
7
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5
NOP
8
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