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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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M7010R датащи(PDF) 56 Page - STMicroelectronics |
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M7010R датащи(HTML) 56 Page - STMicroelectronics |
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56 / 67 page  M7010R 56/67 ARBITRATION Figure 41, page 56 shows an example of the arbi- tration cycle for determining which device drives the SRAM Bus in a single block, up to eight M7010Rs with 136-bit configuration settings. Four cycles from the SEARCH command, all M7010Rs are informed of the SEARCH result within the device and drive their LHO signals. At the next cycle, all downstream devices know the outcome of the SEARCH in all the upstream devic- es. If any of the upstream devices has a hit, all the subsequent devices defer driving the SRAM Bus. If a SEARCH failure occurs, the M7010R with the LRAM Bit set (the last in the chain) drives the SRAM Bus signals. The device with LDEV set to '1' is the default driver of the SSV and SSF sig- nals. Figure 42, page 57 shows how an M7010R arbitrates accesses to the SRAM. Figure 41. Timing Diagram for Arbitration Within a Block Cycle 1 Cycle 2 Cycle 3 Cycle 4 Cycle 5 Cycle 7 Cycle 6 Cycle 8 Cycle 10 Cycle 9 CLK2X CMDV CMD[1:0] ALE_L, CE_L WE_L OE_L SADR[21:0] CMD[8:2] PHS_L AI04293 A B DQ A1 A2 TLSZ = 00, LRAM = 0, LDEV = 0 Learn1 Learn2 Comp1 1A 1B Comp2 X X X X X X X X |
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