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MC8640TVU1250H Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc |
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MC8640TVU1250H Datasheet(HTML) 41 Page - Freescale Semiconductor, Inc |
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41 / 140 page  MPC8640 and MPC8640D Integrated Host Processor Hardware Specifications, Rev. 1 Freescale Semiconductor 41 Ethernet Management Interface Electrical Characteristics Figure 21 provides the AC test load for eTSEC. Figure 21. eTSEC AC Test Load Figure 22 shows the RMII receive AC timing diagram. Figure 22. RMII Receive AC Timing Diagram 9 Ethernet Management Interface Electrical Characteristics The electrical characteristics specified here apply to MII management interface signals MDIO (management data input/output) and MDC (management data clock). The electrical characteristics for GMII, RGMII, RMII, TBI and RTBI are specified in “Section 8, “Ethernet: Enhanced Three-Speed Ethernet (eTSEC), MII Management.” 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 herein 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). Table 36. RMII Receive AC Timing Specifications (continued) At recommended operating conditions with L/TVDD of 3.3 V ± 5%. Parameter/Condition Symbol 1 Min Typ Max Unit 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 |
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