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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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DP83936AVF Scheda tecnica(PDF) 65 Page - National Semiconductor (TI) |
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DP83936AVF Scheda tecnica(HTML) 65 Page - National Semiconductor (TI) |
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65 / 104 page  70 Bus Interface (Continued) 7354 Memory Cycle for BMODE e 0 Synchronous Mode On the rising edge of T1 the SONIC-T asserts ADS and ECS to indicate that the memory cycle is starting The ad- dress (A31 – A1) bus status (S2 – S0) and the direction strobe (MWR) are driven and do not change for the remain- der of the memory cycle On the falling edge of T1 the SONIC-T deasserts ECS ADS is deasserted on the rising edge of T2 In Synchronous mode RDYi is sampled on the rising edge at the end of T2 (the rising edge of the next T1) T2 states will be repeated until RDYi is sampled properly In a low state RDYi must meet the setup and hold times with respect to the rising edge of bus clock for proper operation During read cycles (Figure 7-12) data (D31 – D0) is latched at the rising edge at the end of T2 For write cycles (Figure 7-13) data is driven on the falling edge of T1 and stays driven until the end of the cycle TLF12597 – 39 FIGURE 7-12 Memory Read BMODE e 0 Synchronous (1 Wait-State) TLF12597 – 40 FIGURE 7-13 Memory Write BMODE e 0 Synchronous (1 Wait-State) http www nationalcom 65 |
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