MSM548262-70JS datasheet(31/37 Pages) OKI

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MSM548262

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Load/Read Color Register:

RAS falling edge --- CAS = TRG = WE = DSF = "H"

CAS falling edge --- DSF = "H"

The MSM548262 is provided with an on-chip 8-bit color register for use during the flash write or

block write operation. Each bit of the color register corresponds to one of the DRAM I/O blocks.

The data presented on the DQi lines is subsequently latched into the color register at the falling

edge of either CAS or WE whichever occurs later.

The read color register cycle is activated by holding WE "high" at the falling edge of CAS, and

throughout the remainder of the cycle. The data in the color register becomes valid on the DQi

lines after the specified access times from RAS and TRG are satisfied.

During the load/read color register cycle, the memory cells on the row address latched at the

falling edge of RAS are refreshed.

Flash Write:

RAS falling edge --- CAS = TRG = DSF = "H", WE = "L"

Flash write allows for the data in the color register to be written into all the memory locations of

a selected row.

Each bit of the color register corresponds to one of the DRAM I/O blocks. The flash write

operation can be selectively controlled on an I/O basis in the same manner as the write per bit

operation. The mask data is the same as that of a RAM write cycle.

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