IC42S16100-5T ICSI [Integrated Circuit Solution Inc], IC42S16100-5T Datasheet - Page 34
IC42S16100-5T
Manufacturer Part Number
IC42S16100-5T
Description
512K x 16 Bits x 2 Banks (16-MBIT) SYNCHRONOUS DYNAMIC RAM
Manufacturer
ICSI [Integrated Circuit Solution Inc]
Datasheet
1.IC42S16100-5T.pdf
(78 pages)
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IC42S16100
Burst Data Interruption U/LDQM Pins
(Write Cycle)
Burst data input can be temporarily interrupted (muted )
during a write cycle using the U/LDQM pins. Regardless
of the CAS latency, as soon as one of the U/LDQM pins
goes HIGH, the corresponding externally applied input
data will no longer be written to the device internal circuits.
Subsequently, the corresponding input continues to be
muted as long as that U/LDQM pin remains HIGH.
The IC42S16100 will revert to accepting input as soon as
34
Burst Read and Single Write
The burst read and single write mode is set up using the
mode register set command. During this operation, the
burst read cycle operates normally, but the write cycle only
writes a single data item for each write cycle. The CAS
latency and DQM latency are the same as in normal mode.
CAS latency = 2, 3
CAS latency = 2, burst length = 4
COMMAND
COMMAND
I/O8-I/O15
I/O0-I/O7
CLK
I/O
UDQM
LDQM
CLK
WRITE (CA=A, BANK 0)
DATA MASK (UPPER BYTE)
WRITE (CA=A, BANK 0)
DATA MASK (LOWER BYTE)
WRITE A0
WRITE A0
D
D
t
IN
DMD=0
IN
A0
A0
D
IN
that pin is dropped to LOW and data will be written to the
device. This input control operates independently on a
byte basis with the UDQM pin controlling upper byte input
(pin I/O8 to I/O15) and the LDQM pin controlling the lower
byte input (pins I/O0 to I/O7).
Since the U/LDQM pins control the device input buffers
only, the cycle continues internally and, inparticular,
incrementing of the internal burst counter continues.
A1
D
IN
A2
D
D
IN
IN
A3
A3
Integrated Circuit Solution Inc.
DR024-0D 06/25/2004
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