55.36 GMAC Electrical Specifications

Figure 55-22. MII Ethernet Module Output Timing Diagram (Media-Independent Interface)
Figure 55-23. MII Receive Ethernet Module Timing Diagram (Media-Independent Interface)
Figure 55-24. MII Transmit Ethernet Module Timing Diagram (Media-Independent Interface)
Table 55-50. MII RX/TX Ethernet Module Electrical Specifications
AC CHARACTERISTICS Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial Temperature
Param. No. Symbol Characteristics Min. Typ. Max. Units Conditions
MII Output AC TIMING Requirements
ET_1 tMDIOSU MDIO Set-up Time 10 — — ns VDD = 3.3V with CLOAD = 20 pF
ET_3 tMDIOHOLD MDIO Hold Time 10 — — ns
ET_5 tMDIOVAL MDIO OUTPUT Valid Time 0 — 10 ns
MII RX AC TIMING Requirements
ET_7 tRXCLK RXCLK Period — Note (1) — ns VDD = 3.3V with CLOAD = 20 pF
ET_9 tRXCLKH RXCLK High Time tRXCLK / 2 — — ns
ET_11 tRXCLKL RXCLK Low Time tRXCLK / 2 — — ns
ET_13 tRXSU tRXERSU tRXDVSU ERX[3:0], ERXER and ERXDV Set-up Time 10 — — ns
ET_15 tRXHOLD tRXERHOLD tRXDVHOLD ERX[3:0], ERXER and ERXDV Hold Time 10 — — ns
MII TX AC TIMING Requirements
ET_17 tTXCLK TXCLK Period — Note (1) — ns VDD = 3.3V with CLOAD = 20 pF
ET_19 tTXCLKH TXCLK High Time tTXCLK / 2 — — ns
ET_21 tTXCLKL TXCLK Low Time tTXCLK / 2 — — ns
ET_23 tTXCOLSU tTXCRSSU TXCOL and TXCRS Set-up Time 10 — — ns
ET_25 tTXCOLHOLD tTXCRSHOLD TXCOL and TXCRS Hold Time 10 — — ns
ET_27 tTX[3:0]VAL tTXERVAL tTXENVAL TX[3:0], TXER and TXEN valid times 10 — 25 ns —
Note:
  1. 40 ns, (i.e., 25 MHz), for 100 BASE-TX operation, 400 ns, (i.e., 2.5 MHz), for 10 BASE-T operation. Clock source ppm ≤ 50.
Figure 55-25. RMII Ethernet Module Timing Diagram (Reduced Media-Independent Interface)
Table 55-51. RMII Ethernet Module Electrical Specifications (Reduced Media-Independent Interface)
AC CHARACTERISTICS Standard Operating Conditions: VDD = AVDD = 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial Temperature
Param. No. Symbol Characteristics Min. Typ. Max. Units Conditions
ET_29 tREFCLK Reference Clock Frequency — 20 — ns VDD = 3.3V with CLOAD = 20 pF
ET_31 tREFCLKIH Reference Clock High Time — tREFCLK / 2 — ns
ET_33 tREFCLKIL Reference Clock Low Time — tREFCLK / 2 — ns
ET_35 REFCLKDC Reference Clock Duty Cycle — 50 — %
ET_41 tRX[1:0]SU tRXERSU RXD[1:0], RXER Set-up time 4 — — ns
ET_43 tRX[1:0]HOLD tRXERHOLD RXD[1:0], RXER hold time 2 — — ns
ET_45 tTX[1:0]VAL tTXENVAL TX[1:0], TXEN valid time 2 — 16 ns