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MPC8544E 数据表(PDF) 31 Page - Freescale Semiconductor, Inc |
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MPC8544E 数据表(HTML) 31 Page - Freescale Semiconductor, Inc |
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31 / 117 page  MPC8544E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 5 Freescale Semiconductor 31 Enhanced Three-Speed Ethernet (eTSEC), MII Management Timing diagrams for FIFO appear in Figure 11 and Figure 12. Figure 11. FIFO Transmit AC Timing Diagram Figure 12. FIFO Receive AC Timing Diagram Fall time TX_CLK (80%–20%) tFITF — — 0.75 ns — GTX_CLK to FIFO data TXD[7:0], TX_ER, TX_EN hold time tFITDX 0.5 — 3.0 ns 1 Note: 1. Data valid tFITDV to GTX_CLK Min setup time is a function of clock period and max hold time. (Min setup = Cycle time – Max hold). Table 29. FIFO Mode Receive AC Timing Specification At recommended operating conditions with L/TVDD of 3.3 V ± 5% or 2.5 V ± 5% Parameter/Condition Symbol Min Typ Max Unit Notes RX_CLK clock period tFIR —8.0 — ns — RX_CLK duty cycle tFIRH/tFIRH 45 50 55 % — RX_CLK peak-to-peak jitter tFIRJ —— 250 ps — Rise time RX_CLK (20%–80%) tFIRR — — 0.75 ns — Fall time RX_CLK (80%–20%) tFIRF — — 0.75 ns — RXD[7:0], RX_DV, RX_ER setup time to RX_CLK tFIRDV 1.5 — — ns — RX_CLK to RXD[7:0], RX_DV, RX_ER hold time tFIRDX 0.5 — — ns — Table 28. FIFO Mode Transmit AC Timing Specification (continued) (continued)At recommended operating conditions with L/TVDD of 3.3 V ± 5% or 2.5 V ± 5% Parameter/Condition Symbol Min Typ Max Unit Notes tFITF TXD[7:0] TX_EN GTX_CLK TX_ER tFITDV tFITR tFITH tFIT tFITDX tFIRF tFIRR RX_CLK RXD[7:0] RX_DV RX_ER Valid Data tFIRDX tFIRDV tFIRH tFIR |
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