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MPC5200B датащи(PDF) 40 Page - Freescale Semiconductor, Inc |
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MPC5200B датащи(HTML) 40 Page - Freescale Semiconductor, Inc |
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40 / 72 page ![]() MPC5200B Data Sheet, Rev. 4 40 Freescale Semiconductor Figure 30. Ethernet Timing Diagram—MII Serial Management 1.3.11 USB NOTE Output timing is specified at a nominal 50 pF load. Table 34. MII Serial Management Channel Signal Timing Sym Description Min Max Unit SpecID t10 MDC falling edge to MDIO output delay 0 25 ns A9.10 t11 MDIO (input) to MDC rising edge setup 10 — ns A9.11 t12 MDIO (input) to MDC rising edge hold 10 — ns A9.12 t13 MDC pulse width high(1) 1 MDC is generated by MPC5200B with a duty cycle of 50% except when MII_SPEED in the FEC MII_SPEED control register is changed during operation. See the MPC5200B User’s Manual (MPC5200BUM). 160 — ns A9.13 t14 MDC pulse width low(1) 160 — ns A9.14 t15 MDC period(2) 2 The MDC period must be set to a value of less than or equal to 2.5 MHz (to be compliant with the IEEE MII characteristic) by programming the FEC MII_SPEED control register. See the MPC5200B User’s Manual (MPC5200BUM). 400 — ns A9.15 Table 35. Timing Specifications—USB Output Line Sym Description Min Max Units SpecID 1 USB Bit width(1) 1 Defined in the USB config register, (12 Mbit/s or 1.5 Mbit/s mode). 83.3 667 ns A10.1 2 Transceiver enable time 83.3 667 ns A10.2 3 Signal falling time — 7.9 ns A10.3 4 Signal rising time — 7.9 ns A10.4 t14 t13 t12 MDC (Output) MDIO (Input) MDIO (Output) t11 t10 t15 |
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