48.30 Gigabit Ethernet MAC (GMAC/ETH) Electrical Specifications

Figure 48-28. MII Ethernet Module Output AC Timing Diagrams (media-independent interface)
Figure 48-29. GMII Receive Ethernet Module AC Timing Diagrams (Gigabit media-independent interface)
Figure 48-30. GMII Transmit Ethernet Module AC Timing Diagrams (Gigabit media-independent interface)
Table 48-42. Media-Independent Interface (MII) RX/TX Ethernet Module AC Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO = AVDD 3.0V to 3.63V, VDDREG = 1.75V to 1.85V (unless otherwise stated)

Operating temperature :

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.TypicalMax.UnitsConditions
MII Output AC TIMING Requirements
ET_1tMDIOSUMDIO Set-up Time6——nsVDDIO = 3.3V with CLOAD = 10 pF
ET_3tMDIOHOLDMDIO Hold Time0——ns
ET_5tMDIOVALMDIO OUTPUT Valid Time28—30.2ns
MII RX AC TIMING Requirements
ET_7tRXCLKRXCLK Period(Note 1)——nsVDDIO = 3.3V with CLOAD = 10 pF
ET_9tRXCLKHRXCLK High TimetRXCLK / 2——ns
ET_11tRXCLKLRXCLK Low TimetRXCLK / 2——ns
ET_13tRXSU tRXERSU tRXDVSUERX[3:0], ERXER & ERXDV Set-up Time2.2——ns
ET_15tRXHOLD tRXERHOLD tRXDVHOLDERX[3:0], ERXER & ERXDV Hold Time0.1——ns
MII TX AC TIMING Requirements
ET_17tTXCLKTXCLK Period(Note 1)——nsVDDIO = 3.3V with CLOAD = 10 pF
ET_19tTXCLKHTXCLK High TimetTXCLK / 2——ns
ET_21tTXCLKLTXCLK Low TimetTXCLK / 2——ns
ET_23tTXCOLSU tTXCRSSUTXCOL and TXCRS Set-up Time38——ns
ET_25tTXCOLHOLD tTXCRSHOLDTXCOL and TXCRS Hold Time9.4——ns
ET_27tTX[3:0]VAL tTXERVAL tTXENVALTX[3:0], TXER and TXEN valid times9.4—12ns—
Note:
  1. 8 ns (i.e., 125 MHz) for gigabit, 40 ns (i.e., 25 MHz) for 100BASE-TX operation, 400 ns (i.e., 2.5 MHz) for 10BASE-T operation. Clock source ≤ 50 ppm. Clock accuracy and stability requirements will depend on performance targets and certification requirements.
Figure 48-31. GRMII Ethernet Module AC Timing Diagrams (Gigabit Reduced Media-Independent Interface)
Table 48-43. Reduced Media-Independent Interface (RMII) Ethernet Module AC Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO = AVDD 3.0V to 3.63V, VDDREG = 1.75V to 1.85V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.TypicalMax.UnitsConditions
RMII AC TIMING Requirements
ET_29tREFCLKReference Clock Frequency—(Note 1)—MHzVDDIO = 3.3V with CLOAD = 10 pF
ET_31tREFCLKIHReference Clock High Time—tREFCLK / 2—ns
ET_33tREFCLKILReference Clock Low Time—tREFCLK / 2—ns
ET_35REFCLKDCReference Clock Duty Cycle—50—%
ET_41tRX[1:0]SU tRXERSURXD[1:0], RXER Set-up time3.12——ns
ET_43tRX[1:0]HOLD tRXERHOLDRXD[1:0], RXER Hold time0.7——ns
ET_45tTX[1:0]VAL tTXENVALTX[1:0], TXEN Valid time2.1—5.9ns
Note:
  1. 8 ns (i.e., 125 MHz) for Gigabit, 40 ns (i.e., 25 MHz) for 100BASE-TX operation, 400 ns (i.e., 2.5 MHz) for 10BASE-T operation. Clock source ≤ 50 ppm. Clock accuracy and stability requirements will depend on performance targets and certification requirements.