IC42S16800 ICSI [Integrated Circuit Solution Inc], IC42S16800 Datasheet - Page 28

• Manufacturer Part Number: IC42S16800
• Description: 4(2)M x 8(16) Bits x 4 Banks (128-MBIT) SYNCHRONOUS DYNAMIC RAM
• Manufacturer: ICSI [Integrated Circuit Solution Inc]

IC42S81600/IC42S81600L
IC42S16800/IC42S16800L
Precharge Termination in WRITE Cycle
During WRITE cycle, the burst write operation is terminated by a precharge command.
When the precharge command is issued, the burst write operation is terminated and precharge starts.
The same bank can be activated again after t
invalid data in.
During WRITE cycle, the write data written prior to the precharge command will be correctly stored. However, invalid
data may be written at the same clock as the precharge command. To prevent this from happening, DQM must be
high at the same clock as the precharge command. This will mask the invalid data.
PRECHARGE TERMINATION in WRITE Cycle
28
command
DQ
CAS latency = 3
DQM
CAS latency = 2
CLK
Command
DQM
DQ
T0
Write
D0
Write
D0
T1
D1
D1
RP
from the precharge command. The DQM must be high to mask
T2
D2
D2
T3
D3
D3
T4
PRE
PRE
D4
D4
T5
t
RP
Hi - Z
t
Integrated Circuit Solution Inc.
RP
T6
ACT
Hi - Z
T7
Burst lengh = X
ACT
DR023-0E 6/11/2004
T8