IS42S16128-10T View Datasheet(PDF) - Integrated Silicon Solution
Part Name
Description
MFG CO.
IS42S16128-10T
Integrated Silicon Solution
'IS42S16128-10T' PDF : 75 Pages View PDF
IS42S16128
Read With Auto-Precharge
The read with auto-precharge command first executes a
burst read operation and then puts the selected bank in
the precharged state automatically. After the precharge
completes, the bank goes to the idle state. Thus this
command performs a read command and a precharge
command in a single operation.
During this operation, the delay period (tPQL) between the
last burst data output and the start of the precharge
operation differs depending on the CAS latency setting.
When the CAS latency setting is one, the precharge
operation starts a the same time as the last burst data is
output (tPQL = 0). When the CAS latency setting is two,
ISSI ®
the precharge operation starts on one clock cycle before
the last burst data is output (tPQL = –1). When the CAS
latency setting is three, the precharge operation starts on
two clock cycles before the last burst data is output
(tPQL = –2). Therefore, the selected bank can be made
active after a delay of tRP from the start position of this
precharge operation.
The selected bank must be set to the active state before
executing this command.
The auto-precharge function is invalid if the burst length
is set to full page.
CAS Latency
3
2
tPQL
–2
–1
CLK
COMMAND READA 0
I/O
CAS latency = 2, burst length = 4
READ WITH AUTO-PRECHARGE
(BANK 0)
DOUT 0
DOUT 1
tPQL
DOUT 2 DOUT 3
ACT 0
PRECHARGE START
tRP
CLK
COMMAND READA 0
I/O
READ WITH AUTO-PRECHARGE
(BANK 0)
CAS latency = 3, burst length = 4
DOUT 0
DOUT 1
tPQL
DOUT 2
DOUT 3
PRECHARGE START
tRP
ACT 0
Integrated Silicon Solution, Inc. — 1-800-379-4774
23
Rev. A
03/13/00
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