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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8535E датащи(PDF) 105 Page - Freescale Semiconductor, Inc |
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MPC8535E датащи(HTML) 105 Page - Freescale Semiconductor, Inc |
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105 / 126 page  Clocking MPC8535E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 3 Freescale Semiconductor 105 NOTE The reference impedance for return loss measurements is 50. to ground for both the D+ and D- line (that is, as measured by a Vector Network Analyzer with 50. probes—see Figure 71). Note that the series capacitors, CTX, are optional for the return loss measurement. Figure 70. Minimum Receiver Eye Timing and Voltage Compliance Specification 2.22.1 Compliance Test and Measurement Load The AC timing and voltage parameters must be verified at the measurement point, as specified within 0.2 inches of the package pins, into a test/measurement load shown in Figure 71. NOTE The allowance of the measurement point to be within 0.2 inches of the package pins is meant to acknowledge that package/board routing may benefit from D+ and D– not being exactly matched in length at the package pin boundary. Figure 71. Compliance Test/Measurement Load 2.23 Clocking This section describes the PLL configuration of the MPC8535E. Note that the platform clock is identical to the core complex bus (CCB) clock. TX Silicon + Package C = CTX C = CTX R = 50 Ω R = 50 Ω D+ Package Pin D– Package Pin D+ Package Pin |
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