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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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376 датащи(PDF) 44 Page - Intel Corporation |
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376 датащи(HTML) 44 Page - Intel Corporation |
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44 / 95 page  376 EMBEDDED PROCESSOR 240182 – 22 Idle states are shown here for diagram variety only Write cycles are not always followed by an idle state An active bus cycle can immediately follow the write cycle Figure 47 Various Non-Pipelined Bus Cycles (Various Number of Wait States) Figure 47 illustrates non-pipelined bus cycles with one wait state added to Cycles 2 and 3 READY is sampled inactive at the end of the first T2 in Cycles 2 and 3 Therefore Cycles 2 and 3 have T2 repeated again At the end of the second T2 READY is sam- pled active When address pipelining is not used the address and bus cycle definition remain valid during all wait states When wait states are added and it is desir- able to maintain non-pipelined timing it is necessary to negate NA during each T2 state except the last one as shown in Figure 47 Cycles 2 and 3 If NA is sampled active during a T2 other than the last one the next state would be T2I or T2P instead of another T2 When address pipelining is not used the bus states and transitions are completely illustrated by Figure 48 The bus transitions between four possible states T1 T2 Ti and Th Bus cycles consist of T1 and T2 with T2 being repeated for wait states Oth- erwise the bus may be idle Ti or in the hold ac- knowledge state Th 44 |
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