IC42S16400-6BG ICSI [Integrated Circuit Solution Inc], IC42S16400-6BG Datasheet - Page 19
IC42S16400-6BG
Manufacturer Part Number
IC42S16400-6BG
Description
1M x 16Bit x 4 Banks (64-MBIT) SDRAM
Manufacturer
ICSI [Integrated Circuit Solution Inc]
Datasheet
1.IC42S16400-6BG.pdf
(68 pages)
- Current page: 19 of 68
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IC42S16400
Precharge
The precharge command can be asserted anytime after t
Soon after the precharge command is asserted, the precharge operation is performed and the synchronous DRAM enters
the idle state after t
The earliest timing in a read cycle that a precharge command can be asserted without losing any data in the burst is as
follows.
In order to write all data to the memory cell correctly, the asynchronous parameter t
specification defines the earliest time that a precharge command can be asserted. The minimum number of clocks can be
calculated by dividing t
In summary, the precharge command can be asserted relative to the reference clock that indicates the last data word is
valid. In the following table, minus means clocks before the reference; plus means time after the reference.
Integrated Circuit Solution Inc.
DR034-0E 12/02/2003
PrechargeE
CAS latency = 2
CLK
Command
DQ
Command
CAS latency = 3
DQ
RP
(min.) is satisfied. The parameter t
DPL
(min.) with the clock cycle time.
CAS
CAS
CAS latency
CAS
CAS
T0
Read
Read
2
3
T1
Read
T2
RP
-1
-2
RAS
is the time required to perform the precharge.
Q0
(min.) is satisfied.
T3
+ t
+ t
Q0
Q1
DPL
DPL
Write
((min.)
((min.)
T4
Q1
PRE
PRE
Q2
DPL
T5
must be satisfied. The t
Q2
Q3
T6
(t
Q3
RAS
Hi - Z
is satisfied)
T7
Burst lengh=4
Hi - Z
DPL
(min.)
19
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