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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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IMX35 датащи(PDF) 97 Page - Freescale Semiconductor, Inc |
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IMX35 датащи(HTML) 97 Page - Freescale Semiconductor, Inc |
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97 / 148 page  i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6 Freescale Semiconductor 97 Ground = 0.0 V; load capacitance = 40 pF; MediaLB speed = 1024 Fs; Fs = 48 kHz; all timing parameters specified from the valid voltage threshold as listed below unless otherwise noted. MLB fall time tmckf —— 3 ns VIH TO VIL MLBCLK cycle time tmckc — — 81 40 — — ns 256 × Fs 512 × Fs MLBCLK low time tmckl 31.5 30 37 35.5 — — ns 256 × Fs 256 × Fs PLL unlocked 14.5 14 17 16.5 — — ns 512 × Fs 512 × Fs PLL unlocked MLBCLK high time tmckh 31.5 30 38 36.5 — — ns 256 × Fs 256 × Fs PLL unlocked 14.5 14 17 16.5 — — ns 512 × Fs 512 × Fs PLL unlocked MLBCLK pulse width variation tmpwv —— 2 ns pp Note2 MLBSIG/MLBDAT input valid to MLBCLK falling tdsmcf 1— — ns — MLBSIG/MLBDAT input hold from MLBCLK low tdhmcf 0— — ns — MLBSIG/MLBDAT output high impedance from MLBCLK low tmcfdz 0— tmckl ns — Bus Hold Time tmdzh 4— — ns Note3 1 The MLB controller can shut off MLBCLK to place MediaLB in a low-power state. 2 Pulse width variation is measured at 1.25 V by triggering on one edge of MLBCLK and measuring the spread on the other edge, measured in ns peak-to-peak (pp) 3 The board must be designed to insure that the high-impedance bus does not leave the logic state of the final driven bit for this time period. Therefore, coupling must be minimized while meeting the maximum capacitive load listed. Table 59. MLB Device 1024Fs Timing Parameters Parameter Symbol Min Typ Max Units Comment MLBCLK Operating Frequency1 fmck 45.056 49.152 49.2544 51.200 MHz Min: 1024 × Fs at 44.0 kHz Typ: 1024 × Fs at 48.0 kHz Max: 1024 × Fs at 48.1 kHz Max: 1024 × Fs PLL unlocked MLBCLK rise time tmckr —— 1 ns VIL TO VIH MLB fall time tmckf —— 1 ns VIH TO VIL MLBCLK cycle time tmckc —20.3 — ns — MLBCLK low time tmckl 6.5 6.1 7.7 7.3 — ns PLL unlocked Table 58. MLB 256/512 Fs Timing Parameters (continued) Parameter Symbol Min Typ Max Units Comment |
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