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MSM5412222A Datasheet(PDF) 5 Page - OKI electronic componets

Part No. MSM5412222A
Description  262,214-Word x 12-Bit Field Memory
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Maker  OKI [OKI electronic componets]
Homepage  http://www.oki.com
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MSM5412222A Datasheet(HTML) 5 Page - OKI electronic componets

 
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OKI Semiconductor
MSM5412222A
5
Write Operation
The write operation is controlled by three clocks, SWCK, RSTW, and WE. Write operation is
accomplished by cycling SWCK, and holding WE high after the write address pointer reset
operation or RSTW.
Each write operation, which begins after RSTW, must contain at least 80 active write cycles,
i.e. SWCK cycles while WE is high. To transfer the last data to the DRAM array, which at that
time is stored in the serial data registers attached to the DRAM array, an RSTW operation is
required after the last SWCK cycle.
Note that every write timing of MSM5412222A is delayed by one clock compared with read
timings for easy cascading without any interface delay devices.
Write Reset : RSTW
The first positive transition of SWCK after RSTW becomes high resets the write address
counters to zero. RSTW setup and hold times are referenced to the rising edge of SWCK.
Because the write reset function is solely controlled by the SWCK rising edge after the high
level of RSTW, the states of WE and IE are ignored in the write reset cycle.
Before RSTW may be brought high again for a further reset operation, it must be low for at
least
two SWCK cycles.
Data Inputs : D IN 0 - 11
Write Clock : SWCK
The SWCK latches the input data on chip when WE is high, and also increments the internal
write address pointer. Data-in setup time tDS , and hold time tDH are referenced to the rising
edge of SWCK.
Write Enable : WE
WE is used for data write enable/disable control. WE high level enables the input, and WE
low level disables the input and holds the internal write address pointer. There are no WE
disable time (low) and WE enable time (high) restrictions, because the MSM5412222A is in
fully static operation as long as the power is on. Note that WE setup and hold times are
referenced to the rising edge of SWCK.
Input Enable : IE
IE is used to enable/disable writing into memory. IE high level enables writing. The internal
write address pointer is always incremented by cycling SWCK regardless of the IE level.
Note that IE setup and hold times are referenced to the rising edge of SWCK.
OPERATION


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