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MPC852T датащи(PDF) 58 Page - Freescale Semiconductor, Inc |
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MPC852T датащи(HTML) 58 Page - Freescale Semiconductor, Inc |
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58 / 80 page ![]() MPC852T Hardware Specifications, Rev. 3.1 58 Freescale Semiconductor FEC Electrical Characteristics Figure 59. MII Transmit Signal Timing Diagram 15.3 MII Async Inputs Signal Timing (MII_CRS, MII_COL) Table 27 provides information about the MII async inputs signal timing. Figure 60 shows the MII asynchronous inputs signal timing diagram. Figure 60. MII Async Inputs Timing Diagram 15.4 MII Serial Management Channel Timing (MII_MDIO, MII_MDC) Table 28 provides information on the MII serial management channel signal timing. The FEC functions correctly with a maximum MDC frequency in excess of 2.5 MHz. The exact upper bound is under investigation. Table 27. MII Async Inputs Signal Timing Num Characteristic Min Max Unit M9 MII_CRS, MII_COL minimum pulse width 1.5 — MII_TX_CLK period Table 28. MII Serial Management Channel Timing Num Characteristic Min Max Unit M10 MII_MDC falling edge to MII_MDIO output invalid (minimum propagation delay) 0 — ns M11 MII_MDC falling edge to MII_MDIO output valid (max prop delay) — 25 ns M12 MII_MDIO (input) to MII_MDC rising edge setup 10 — ns M13 MII_MDIO (input) to MII_MDC rising edge hold 0 — ns M6 MII_TX_CLK (input) MII_TXD[3:0] (outputs) MII_TX_EN MII_TX_ER M5 M7 M8 MII_CRS, MII_COL M9 |
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