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DP8500 데이터시트(PDF) 39 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DP8500
상세설명  DP8520A/DP8521A/DP8522A microCMOS Programmable 256k/1M/4M Video RAM Controller/Drivers
PDF  70 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP8500 데이터시트(HTML) 39 Page - National Semiconductor (TI)

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90 Programming and Resetting (Continued)
93 EXTERNAL RESET
At power up if the internal power up reset worked all inter-
nal latches and flip-flops are cleared The power up state is
entered by asserting ML and DISRFSH for 16 positive edg-
es of CLK After 16 clocks if the user negates DISRFSH
before negating ML as shown in
Figure 51 ML negated
will program the chip If ML is negated before or at the same
time as DISRFSH as shown in
Figure 52 the chip will not be
programmed After the chip is programmed the 60 ms ini-
tialization period will be entered into if this is the first pro-
gramming after power up or reset The user must perform
an external reset before programming the DP8520A21A
22A
TLF9338 – A2
FIGURE 51 Chip Reset and Programmed
TLF9338 – A3
FIGURE 52 Chip Reset but Not Programmed
39



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