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PC87570-ICC/VUL датащи(PDF) 41 Page - National Semiconductor (TI) |
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PC87570-ICC/VUL датащи(HTML) 41 Page - National Semiconductor (TI) |
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41 / 168 page ![]() Bus Interface Unit (BIU) 41 www.national.com Other SZCFGn configuration SZCFGn.HOLD = 0 SZCFGn.HOLD ≠ 0 SZCFGn.WAIT ≠ 0 SZCFGn.WAIT = 0 Address placed on A0-15, SELn: activated RD: active Address on A0-15 invalid/changed, SELn and RD inactive RD: active, End of T2: Data is sampled Internal waits corresponding to SZCFGn.WAIT T1 TIW TBW T1 begin Hold cycles completed Thold T2 T2B end {SZCFGn.BW = 1 or SZCFGn.BRE = 0 or Core attempts to read a byte} SZCFGn.BW = 0 SZCFGn.(WBR,BRE} = 11 Core attempts to read a word Next address on A0-15, End of T2B: Data sampled Hold cycles according to SZCFGn.HOLD First Thold: SELn and RD are deactivated SZCFGn.{BW,WBR,BRE} = 001 Core attempts to read a word Figure 3-9. Normal Read Bus Cycle Note: Any reference to SZCFGn, also applies to the IOCFG Register. Any reference to SELn, also applies to the SELIO signal. TBW and T2B states do not exist in bus cycles of the IO zone. Internal waits completed SZCFGn.HOLD ≠ 0 Next address on A0-15 |
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