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MSM548263

更新时间： 2022-12-13 04:56:09

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MSM548263 数据手册

¡ Semiconductor

MSM548263

Masked Split Write Transfer: RAS falling edge --- CAS = DSF = "H", TRG = WE = "L"

Split write transfer consists of loading 256 words by 8 bits of data from the non-active split SAM

other half of the split SAM register simultaneously. During split write transfer operation, the

RAM port input clocks do not have to be synchronized with the serial clock SC, thus allowing

for real time transfer. This operation is the same as a mask write operation in RAM, so new and

persistent mode can be supported.

A split write transfer can be performed after a delay of t

from the change of state of the QSF

STS

output is satisfied.

A masked write transfer operation must precede split write transfer. The purpose is to switch the

SAM port from output mode to input mode, and to set the initial TAP location prior to split write

transfer operations.

Programmable SAM Stops in Split Transfer Cycle

The MSM548263 has a boundary split register operation using programmable stops. If a CBRS

cycle has been performed, the split transfer cycle performs the boundary operation.

Figure 2 shows an example of a boundary split register (4 stop points). The stop points define a

SAM location at which the access will change from one half of the SAM to the other half (at the

TAP address).

Lower SAM

TAP3

Upper SAM

TAP2

TAP1

255

256

511

S.T. (TAP2)

S.T. (TAP3)

Figure 2. Example of Boundary Split Register

37/40

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型号	品牌	描述	获取价格	数据表
MSM548263-60JS	OKI	Video DRAM, 256KX8, 60ns, CMOS, PDSO40, 0.400 INCH, 1.27 MM PITCH, PLASTIC, SOJ-40	获取价格
MSM548263-60TS-K	OKI	Video DRAM, 256KX8, 60ns, CMOS, PDSO40, 0.400 INCH, 0.80 MM PITCH, PLASTIC, TSOP2-44/40	获取价格
MSM548263-70JS	OKI	Video DRAM, 256KX8, 70ns, CMOS, PDSO40, 0.400 INCH, 1.27 MM PITCH, PLASTIC, SOJ-40	获取价格
MSM548263-70TS-K	OKI	Video DRAM, 256KX8, 70ns, CMOS, PDSO40, 0.400 INCH, 0.80 MM PITCH, PLASTIC, TSOP2-44/40	获取价格
MSM548263-80TS-K	OKI	Video DRAM, 256KX8, 80ns, CMOS, PDSO40, 0.400 INCH, 0.80 MM PITCH, PLASTIC, TSOP2-44/40	获取价格
MSM548331	OKI	222,720-Word x 12-Bit Field Memory	获取价格