IS42S16800A1 View Datasheet(PDF) - Integrated Silicon Solution
Part Name
Description
Manufacturer
IS42S16800A1 Datasheet PDF : 63 Pages
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IS42S16800A1
ISSI ®
Burst Read Command
The Burst Read command is initiated by having CS and CAS low while holding RAS and WE high at the rising edge of the clock.
The address inputs determine the starting column address for the burst, the Mode Register sets the type of burst (sequential or
interleave) and the burst length (1, 2, 4, 8). The delay from the start of the command to when the data from the first cell appears
on the outputs is equal to the value of the CAS latency that is set in the Mode Register.
Burst Read Operation
(Burst Length = 4, CAS latency = 2, 3)
T0
T1
T2
T3
T4
T5
T6
T7
T8
CK
COMMAND READ A
NOP
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CAS latency = 2
tCK2, DQs
CAS latency = 3
tCK3, DQs
DOUT A0
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
DOUT A3
Read Interrupted by a Read
A Burst Read may be interrupted before completion of the burst by another Read Command, with the only restriction being that
the interval that separates the commands must be at least one clock cycle. When the previous burst is interrupted, the remain-
ing addresses are overridden by the new address with the burst length. The data from the first Read Command continues to
appear on the outputs until the CAS latency from the interrupting Read Command is satisfied, at this point the data from the
interrupting Read Command appears.
Read Interrupted by a Read
(Burst Length = 4, CAS latency = 2, 3)
T0
T1
T2
T3
T4
T5
T6
T7
T8
CK
COMMAND READ A
READ B
NOP
NOP
NOP
NOP
NOP
NOP
NOP
CAS latency = 2
tCK2, DQs
CAS latency = 3
tCK3, DQs
DOUT A0
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DOUT A0
DOUT B0
DOUT B1
DOUT B2
DOUT B3
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Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
©
Rev. 00B
N
05/01/06
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