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MCF5373CAB180 датащи(PDF) 34 Page - Freescale Semiconductor, Inc |
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MCF5373CAB180 датащи(HTML) 34 Page - Freescale Semiconductor, Inc |
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34 / 42 page ![]() MCF5373 ColdFire® Microprocessor Data Sheet, Rev. 0.3 Preliminary Preliminary Electrical Characteristics Freescale Semiconductor 34 Figure 22. MII Receive Signal Timing Diagram 5.14.2 MII Transmit Signal Timing (FEC_TXD[3:0], FEC_TXEN, FEC_TXER, FEC_TXCLK) Table 19 lists MII transmit channel timings. The transmitter functions correctly up to a FEC_TXCLK maximum frequency of 25 MHz +1%. There is no minimum frequency requirement. In addition, the processor clock frequency must exceed twice the FEC_TXCLK frequency. The transmit outputs (FEC_TXD[3:0], FEC_TXEN, FEC_TXER) can be programmed to transition from either the rising or falling edge of FEC_TXCLK, and the timing is the same in either case. This options allows the use of non-compliant MII PHYs. Refer to the Ethernet chapter for details of this option and how to enable it. Table 19. MII Transmit Signal Timing Num Characteristic Min Max Unit M5 FEC_TXCLK to FEC_TXD[3:0], FEC_TXEN, FEC_TXER invalid 5 — ns M6 FEC_TXCLK to FEC_TXD[3:0], FEC_TXEN, FEC_TXER valid — 25 ns M7 FEC_TXCLK pulse width high 35% 65% FEC_TXCLK period M8 FEC_TXCLK pulse width low 35% 65% FEC_TXCLK period M1 M2 FEC_RXCLK (input) FEC_RXD[3:0] (inputs) FEC_RXDV FEC_RXER M3 M4 |
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