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MPC8544E 数据表(PDF) 42 Page - Freescale Semiconductor, Inc |
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MPC8544E 数据表(HTML) 42 Page - Freescale Semiconductor, Inc |
42 / 120 page MPC8544E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 3 42 Freescale Semiconductor Enhanced Three-Speed Ethernet (eTSEC), MII Management 8.7.5.2 RMII Receive AC Timing Specifications Table 39 shows the RMII receive AC timing specifications. Figure 24 provides the AC test load for eTSEC. Figure 24. eTSEC AC Test Load Figure 25 shows the RMII receive AC timing diagram. Figure 25. RMII Receive AC Timing Diagram Table 39. RMII Receive AC Timing Specifications At recommended operating conditions with L/TVDD of 3.3 V ± 5%.or 2.5 V ± 5%. Parameter/Condition Symbol1 Min Typ Max Unit Notes REF_CLK clock period tRMR 15.0 20.0 25.0 ns — REF_CLK duty cycle tRMRH 35 50 65 % — REF_CLK peak-to-peak jitter tRMRJ —— 250 ps — Rise time REF_CLK (20%–80%) tRMRR 1.0 — 2.0 ns — Fall time REF_CLK (80%–20%) tRMRF 1.0 — 2.0 ns — RXD[1:0], CRS_DV, RX_ER setup time to REF_CLK rising edge tRMRDV 4.0 — — ns — RXD[1:0], CRS_DV, RX_ER hold time to REF_CLK rising edge tRMRDX 2.0 — — ns — Note: 1. The symbols used for timing specifications follow the pattern of t(first two letters of functional block)(signal)(state)(reference)(state) for inputs and t(first two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tMRDVKH symbolizes MII receive timing (MR) with respect to the time data input signals (D) reach the valid state (V) relative to the tMRX clock reference (K) going to the high (H) state or setup time. Also, tMRDXKL symbolizes MII receive timing (GR) with respect to the time data input signals (D) went invalid (X) relative to the tMRX clock reference (K) going to the low (L) state or hold time. Note that, in general, the clock reference symbol representation is based on three letters representing the clock of a particular functional. For example, the subscript of tMRX represents the MII (M) receive (RX) clock. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall). Output Z0 = 50 Ω LVDD/2 RL = 50 Ω REF_CLK RXD[1:0] tRMRDX tRMR tRMRH tRMRR tRMRF CRS_DV RX_ER tRMRDV Valid Data |
类似零件编号 - MPC8544E |
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类似说明 - MPC8544E |
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