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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT79L71 датащи(PDF) 85 Page - Exar Corporation |
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XRT79L71 датащи(HTML) 85 Page - Exar Corporation |
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85 / 109 page  XRT79L71 82 REV. 1.0.0 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - HARDWARE NOTE: The values for "t0" through "t7", in this figure can be found in Table 8. FIGURE 7. ASYNCHRONUS MODE 1 - INTEL TYPE PROGRAMMED I/O TIMING (READ CYCLE) TABLE 8: TIMING INFORMATION FOR THE MICROPROCESSOR INTERFACE, WHEN CONFIGURED TO OPERATE IN THE INTEL ASYNCHRONOUS MODE Test Conditions: TA = 25°C, VCC = 3.3V±5% and 2.5V±5%, unless otherwise specified. TIMING DESCRIPTION MIN. TYP. MAX. t0 Address setup time to pALE low 4 - - t1 Address hold time from pALE low 4 - - t2 pRD_L, pWR_L pulse width 320 - - t3 Data setup time to pWR_L low 0 - - t4 Data hold time from pWR_L high 0 - - t5 pALE low to pRD_L, pWR_L low 5 - - t6 Data invalid from pRD_L high 4 - - t7 Data valid from pRDY_L low - - 0 t8 pRDY inactive from pRD_L inactive 3 9 Address Data CS ALE_AS A[14:0] D[7:0] RD_DS WR_R/W RDY_DTACK t 2 t 7 t 6 t 1 t 0 t 5 |
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