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IMX35 датащи(PDF) 37 Page - Freescale Semiconductor, Inc |
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IMX35 датащи(HTML) 37 Page - Freescale Semiconductor, Inc |
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37 / 148 page ![]() i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6 Freescale Semiconductor 37 NOTE Test conditions: load capacitance, 25 pF. Recommended drive strength for all controls, address, and BCLK is set to maximum drive. Recommended drive strength for all controls, address and BCLK is set to maximum drive. Table 30. WEIM Bus Timing Parameters1 1 “High” is defined as 80% of signal value, and “low” is defined as 20% of signal value. ID Parameter Min. Max. Unit WE1 BCLK cycle time2 2 BCLK parameters are measured from the 50% point. For example, “high” is defined as 50% of signal value and “low” is defined as 50% of signal value. 14.5 — ns WE2 BCLK low-level width2 7— ns WE3 BCLK high-level width2 7— ns WE4 Clock fall to address valid 15 21 ns WE5 Clock rise/fall to address invalid 22 25 ns WE6 Clock rise/fall to CSx_B valid 15 19 ns WE7 Clock rise/fall to CSx_B invalid 3.6 5 ns WE8 Clock rise/fall to RW_B valid 8 12 ns WE9 Clock rise/fall to RW_B invalid 3 8 ns WE10 Clock rise/fall to OE_B valid 7 12 ns WE11 Clock rise/fall to OE_B invalid 3.8 5.5 ns WE12 Clock rise/fall to EBy_B valid 6 11.5 ns WE13 Clock rise/fall to EBy_B invalid 6 10 ns WE14 Clock rise/fall to LBA_B valid 17.5 20 ns WE15 Clock rise/fall to LBA_B invalid 0 1 ns WE16 Clock rise/fall to Output Data valid 5 10 ns WE17 Clock rise to Output Data invalid 0 2.5 ns WE18 Input Data Valid to Clock rise3 3 Parameters W18, W20, W22, and W24 are tested when FCE=1. i.MX35 does not support FCE=0. 1— ns WE20 Clock rise to Input Data invalid3 1— ns WE22 ECB_B setup time3 5— ns WE24 ECB_B hold time3 0— ns WE26 DTACK_B setup time 5.4 — ns WE27 DTACK_B hold time –3.2 — ns |
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