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AS4C16M16S-6TCN Datasheet(PDF) 11 Page - Alliance Semiconductor Corporation

Part # AS4C16M16S-6TCN
Description  Programmable Mode registers
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Manufacturer  ALSC [Alliance Semiconductor Corporation]
Direct Link  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

AS4C16M16S-6TCN Datasheet(HTML) 11 Page - Alliance Semiconductor Corporation

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AS4C16M16S
Confidential
11
Rev. 3
Feb. /2014
CLK
COMMAND
T0
T1
T2
T3
T4
T5
T6
NOP
WRITE A
READ B
NOP
NOP
NOP
NOP
NOP
T7
T8
NOP
CAS# Latency=2
tCK2, DQ
CAS# Latency=3
tCK3, DQ
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DIN A0
don’t care
DIN A0
don’t care
don’t care
Input data must be removed from the DQ at
least one clock cycle before the Read data
appears on the outputs to avoid data contention
Figure 12. Write Interrupted by a Read (Burst Length = 4, CAS# Latency = 2, 3)
The BankPrecharge/PrechargeAll command that interrupts a write burst without the auto precharge
function should be issued m cycles after the clock edge in which the last data-in element is registered, where m
equals tWR/tCK rounded up to the next whole number. In addition, the DQM signals must be used to mask input
data, starting with the clock edge following the last data-in element and ending with the clock edge on which the
BankPrecharge/PrechargeAll command is entered (refer to the following figure).
CLK
COMMAND
T0
T1
T2
T3
T4
T5
T6
WRITE
NOP
NOP
Precharge
NOP
NOP
Activate
NOP
T7
DQM
Don’t Care
ADDRESS
Bank
Col n
Bank (s)
ROW
tRP
DIN
n
DIN
N+1
tWR
DQ
Note: The DQMs can remain low in this example if the length of the write burst is 1 or 2.
Figure 13. Write to Precharge
7
Write and AutoPrecharge command
(RAS# = "H", CAS# = "L", WE# = "L", BAs = Bank, A10 = "H", A0-A8 = Column Address)
The Write and AutoPrecharge command performs the precharge operation automatically after the write
operation. Once this command is given, any subsequent command can not occur within a time delay of
{(burst length -1) + tWR + tRP(min.)}. At full-page burst, only the write operation is performed in this command
and the auto precharge function is ignored.
CLK
DQ
T0
T1
T2
T3
T4
T5
T6
DIN A0
DIN A1
T7
T8
COMMAND
Bank A
Activate
NOP
NOP
WRITE A
Auto Precharge
NOP
NOP
NOP
NOP
NOP
T9
Bank A
Activate
tDAL=tWR+tRP
tDAL
Begin AutoPrecharge
Bank can be reactivated at
completion of tDAL
Figure 14. Burst Write with Auto-Precharge (Burst Length = 2)


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