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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC855T датащи(PDF) 69 Page - Freescale Semiconductor, Inc |
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MPC855T датащи(HTML) 69 Page - Freescale Semiconductor, Inc |
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69 / 80 page  MPC860 PowerQUICC™ Family Hardware Specifications, Rev. 8 Freescale Semiconductor 69 FEC Electrical Characteristics 13.3 MII Async Inputs Signal Timing (MII_CRS, MII_COL) Table 31 provides information on the MII async inputs signal timing. Figure 74 shows the MII asynchronous inputs signal timing diagram. Figure 74. MII Async Inputs Timing Diagram 13.4 MII Serial Management Channel Timing (MII_MDIO, MII_MDC) Table 32 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 31. 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 32. 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 M14 MII_MDC pulse width high 40% 60% MII_MDC period M15 MII_MDC pulse width low 40% 60% MII_MDC period MII_CRS, MII_COL M9 |
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