SMJ44C251B Datasheet, PDF (13/57 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
NORMAL-READ TRANSFER
(refer to Figure 7)
address bits (A0– A8) are latched at the falling edge of CAS\ to
select one of the SAM’s 512 available tap points where the
serial data is read out.
A normal-read transfer can be performed in three ways:
early-load read transfer, real-time or midline-load read transfer,
and late-load read transfer. Each of these offers the flexibility of
controlling the TRG\ trailing edge in the read-transfer cycle
(see Figure 7).
FIGURE 6: NORMAL-WRITE-TRANSFER-CYCLE TIMING
FIGURE 7: NORMAL-READ-TRANSFER TIMINGS
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
13
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