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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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W39V080FAQ датащи(PDF) 12 Page - Winbond |
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W39V080FAQ датащи(HTML) 12 Page - Winbond |
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12 / 35 page  W39V080FA - 12 - 6.14 Fwh Cycle Definition FIELD NO. OF CLOCKS DESCRIPTION START 1 "1101b" indicates FWH Memory Read cycle; while "1110b" indicates FWH Memory Write cycle. 0000b" appears on FWH bus to indicate the initial IDSEL 1 This one clock field indicates which FWH component is being selected. MSIZE 1 Memory Size. There is always show “0000b” for single byte access. TAR 2 Turned Around Time ADDR 7 Address Phase for Memory Cycle. FWH supports the 28 bits address protocol. The addresses transfer most significant nibble first and least significant nibble last. (i.e. Address[27:24] on FWH[3:0] first, and Address[3:0] on FWH[3:0] last.) SYNC N Synchronous to add wait state. "0000b" means Ready, "0101b" means Short Wait, "0110b" means Long Wait, "1001b" for DMA only, "1010b" means error, and other values are reserved. DATA 2 Data Phase for Memory Cycle. The data transfer least significant nibble first and most significant nibble last. (i.e. DQ[3:0] on FWH[3:0] first, then DQ[7:4] on FWH[3:0] last.) |
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