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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8569E датащи(PDF) 57 Page - Freescale Semiconductor, Inc |
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MPC8569E датащи(HTML) 57 Page - Freescale Semiconductor, Inc |
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57 / 127 page  Ethernet Interface MPC8569E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1 Freescale Semiconductor 57 2.6.3.2.1 MII Transmit AC Timing Specifications The following table provides the MII transmit AC timing specifications. The following figure shows the MII transmit AC timing diagram. Figure 15. MII Transmit AC Timing Diagram 2.6.3.2.2 MII Receive AC Timing Specifications The following table provides the MII receive AC timing specifications. Table 27. MII Transmit AC Timing Specifications For recommended operating conditions, see Table 3 Parameter Symbol Min Typ Max Unit Note TX_CLK clock period 10 Mbps tMTX 399.96 400 400.04 ns — TX_CLK clock period 100 Mbps tMTX 39.996 40 40.004 ns — TX_CLK duty cycle tMTXH/tMTX 35 — 65 % — TX_CLK to MII data TXD[3:0], TX_ER, TX_EN delay tMTKHDX 0 — 25 ns — TX_CLK data clock rise (20%–80%) tMTXR 1.0 — 4.0 ns — TX_CLK data clock fall (80%–20%) tMTXF 1.0 — 4.0 ns — Table 28. MII Receive AC Timing Specifications For recommended operating conditions, see Table 3 Parameter Symbol Min Typ Max Unit Note RX_CLK clock period 10 Mbps tMRX 399.96 400 400.04 ns 1 RX_CLK clock period 100 Mbps tMRX 39.996 40 40.004 ns 1 RX_CLK duty cycle tMRXH/tMRX 35 — 65 % 2 RXD[3:0], RX_DV, RX_ER setup time to RX_CLK tMRDVKH 10.0 — — ns RXD[3:0], RX_DV, RX_ER hold time to RX_CLK tMRDXKH 10.0 — — ns RX_CLK clock rise (20%–80%) tMRXR 1.0 — 4.0 ns 2 RX_CLK clock fall time (80%–20%) tMRXF 1.0 — 4.0 ns 2 Note: 1. The frequency of RX_CLK should not exceed the frequency of TX_CLK by more than 300 ppm. 2. System/board must be designed to ensure the input requirement to the device is achieved. Proper device operation is guaranteed for inputs meeting this requirement by design, simulation, characterization, or functional testing. TX_CLK TXD[3:0] tMTKHDX tMTX tMTXH tMTXR tMTXF TX_EN TX_ER |
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