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DP8422V 데이터시트(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP8422V
상세설명  microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
PDF  60 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8422V 데이터시트(HTML) 16 Page - National Semiconductor (TI)

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40 Port A Access Modes (Continued)
44 READ-MODIFY-WRITE CYCLES
WITH EITHER ACCESS MODE
There are 2 methods by which this chip can be used to do
read-modify-write access cycles The first method involves
doing a late write access where the WIN input is asserted
some delay after CAS is asserted The second method in-
volves doing a page mode read access followed by a page
mode write access with RAS held low (see
Figure 9c )
CASn must be toggled using the ECASn inputs and WIN has
to be changed from negated to asserted (read to write)
while CAS is negated This method is better than changing
WIN from negated to asserted in a late write access be-
cause here a problem may arise with DATA IN and DATA
OUT being valid at the same time This may result in a data
line trying to drive two different levels simultaneously The
page mode method of a read-modify-write access allows
the user to have transceivers in the system because the
data in (read data) is guaranteed to be high impedance dur-
ing the time the data out (write data) is valid
TLF11109 – 13
There may be idle states inserted here by the CPU
FIGURE 9c Read-Modify-Write Access Cycle
16



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