MT42C4256C-10/883C AUSTIN [Austin Semiconductor], MT42C4256C-10/883C Datasheet - Page 47

• Manufacturer Part Number: MT42C4256C-10/883C
• Description: 256K X 4 VRAM 256K x 4 DRAM with 512K x 4 SAM
• Manufacturer: AUSTIN [Austin Semiconductor]

NOTES:
NOTE U: The serial data-in cycle is used to input serial data into the data registers. Before data can be written into the data registers via the SDQ
terminals, the device must be put into the write mode by performing a write-mode-control (pseudo-transfer) cycle or any other write-transfer cycle.
A read-transfer cycle is the only cycle that takes the serial port (SAM) out of the write mode and puts it into the read mode, disabling the input data.
Data is written starting at the location specified by the input address loaded on the previous transfer cycle.
NOTE V: While accessing data in the serial-data registers, the state of TRG\ is a don’t care as long as TRG\ is held high when RAS\ goes low to prevent
data transfers between memory and data registers.
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
FIGURE 37: Serial-Write-Cycle Timing (SE\-Controlled Write)
Austin Semiconductor, Inc.
47
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
SMJ44C251B
MT42C4256
VRAM
VRAM
VRAM
VRAM
VRAM