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31 page 
MPC8568E/MPC8567E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 1 Freescale Semiconductor 31 Ethernet Interface and MII Management Figure 9 shows the GMII transmit AC timing diagram. Figure 9. GMII Transmit AC Timing Diagram 8.2.2.2 GMII Receive AC Timing Specifications Table 28 provides the GMII receive AC timing specifications. EC_GTX_CLK125 duty cycle tG125H/tG125 45 55 ns Notes: 1. The symbols used for timing specifications herein follow the pattern 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, tGTKHDV symbolizes GMII transmit timing (GT) with respect to the tGTX clock reference (K) going to the high state (H) relative to the time date input signals (D) reaching the valid state (V) to state or setup time. Also, tGTKHDX symbolizes GMII transmit timing (GT) with respect to the tGTX clock reference (K) going to the high state (H) relative to the time date input signals (D) going invalid (X) 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 tGTX represents the GMII(G) transmit (TX) clock. For rise and fall times, the latter convention is used with the appropriate letter: R (rise) or F (fall). 2. Guaranteed by design Table 28. GMII Receive AC Timing Specifications At recommended operating conditions with L/TVDD of 3.3 V ± 5%. Parameter/Condition Symbol 1 Min Typ Max Unit RX_CLK clock period tGRX —8.0 — ns RX_CLK duty cycle tGRXH/tGRX 40 — 60 ns RXD[7:0], RX_DV, RX_ER setup time to RX_CLK tGRDVKH 2.0 — — ns RXD[7:0], RX_DV, RX_ER hold time to RX_CLK tGRDXKH 0.5 — — ns RX_CLK clock rise (20%-80%) tGRXR 2 —1.0 2.0 ns Table 27. GMII Transmit AC Timing Specifications (continued) At recommended operating conditions with LVDD of 3.3 V ± 5%. Parameter/Condition Symbol 1 Min Typ Max Unit GTX_CLK TXD[7:0] tGTKHDX tGTX tGTXH tGTXR tGTXF tGTKHDV TX_EN TX_ER |
