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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LAN9250 датащи(PDF) 119 Page - Microchip Technology |
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LAN9250 датащи(HTML) 119 Page - Microchip Technology |
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119 / 421 page  2015 Microchip Technology Inc. DS00001913A-page 119 LAN9250 9.5.7.3 Write Timing Requirements If RD and WR signaling is used, a host write cycle begins when WR is asserted with CS active. The cycle ends when WR is de-asserted. CS maybe asserted and de-asserted along with WR but not during WR active. Alternatively, if RD_WR and ENB signaling is used, a host write cycle begins when ENB is asserted with CS active and RD_WR indicating a write. The cycle ends when ENB is de-asserted. CS maybe asserted and de-asserted along with ENB but not during ENB active. Please refer to Section 9.5.6, "Indexed Address Mode Functional Timing Diagrams," on page 102 for functional descrip- tions. FIGURE 9-44: INDEXED ADDRESSING WRITE CYCLE TIMING TABLE 9-6: INDEXED ADDRESSING WRITE CYCLE TIMING VALUES Symbol Description Min Typ Max Units tcswr CS Setup to WR or ENB Active 0 ns twrcs CS Hold from WR or ENB Inactive 0 ns tas Address, FIFOSEL Setup to WR or ENB Active 0 ns tah Address, FIFOSEL Hold from to WR or ENB Inactive 0 ns trdwrs RD_WR Setup to ENB Active Note 18 5ns trdwrh RD_WR Hold from ENB Inactive Note 18 5ns tds Data Setup to WR or ENB Inactive 7 ns tdh Data Hold from WR or ENB Inactive 0 ns ENB, WR D[7:0] RD CS twr twrwr twrrd twrcyc RD_WR trdwrh tcswr twrcs tds tdh D[15:8] FIFOSEL A[4:0] tas tah tas tah trdwrs |
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