51.32 Ethernet MAC (ETH) Electrical Specifications

Figure 51-30. MII Ethernet Module Output AC Timing Diagrams (Media-Independent Interface)
Figure 51-31. GMII Receive Ethernet Module AC Timing Diagrams (Gigabit Media-Independent Interface)
Figure 51-32. GMII Transmit Ethernet Module AC Timing Diagrams (Gigabit Media-Independent Interface)
Table 51-45. MII RX/TX Ethernet Module AC Electrical Specifications (Media-Independent Interface)
AC CHARACTERISTICSStandard Operating Conditions: VDDREG=VDDIO=AVDD 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
MII Output AC TIMING Requirements
ET_1tMDIOSUMDIO Set-up Time-32nsVDDIO = 3.3V with CLOAD = 20 pF
ET_3tMDIOHOLDMDIO Hold Time0ns
ET_5tMDIOVALMDIO OUTPUT Valid Time3640ns
MII RX AC TIMING Requirements
ET_7tRXCLKRXCLK PeriodNote 1nsVDDIO = 3.3V with CLOAD = 20 pF
ET_9tRXCLKHRXCLK High TimetRXCLK / 2ns
ET_11tRXCLKLRXCLK Low TimetRXCLK / 2ns
ET_13tRXSU tRXERSU tRXDVSUERX[3:0], ERXER & ERXDV Set-up Time4ns
ET_15tRXHOLD tRXERHOLD tRXDVHOLDERX[3:0], ERXER & ERXDV Hold Time0ns
MII TX AC TIMING Requirements
ET_17tTXCLKTXCLK PeriodNote 1nsVDDIO = 3.3V with CLOAD = 20 pF
ET_19tTXCLKHTXCLK High TimetTXCLK / 2ns
ET_21tTXCLKLTXCLK Low TimetTXCLK / 2ns
ET_23tTXCOLSU tTXCRSSUTXCOL & TXCRS Set-up Time29ns
ET_25tTXCOLHOLD tTXCRSHOLDTXCOL & TXCRS Hold Time9ns
ET_27tTX[3:0]VAL tTXERVAL tTXENVALTX[3:0], TXER & TXEN valid times911ns
Note:
  1. 40ns, (i.e. 25 MHz), for 100BASE-TX operation, 400ns, (i.e. 2.5 MHz), for 10BASE-T operation. Clock source ≤ 50ppm. Clock accuracy and stability requirements will depend on performance targets and certification requirements.
Figure 51-33. RMII Ethernet Module AC Timing Diagrams (Reduced Media-Independent Interface)
Table 51-46. RMII Ethernet Module AC Electrical Specifications (Reduced Media-Independent Interface)
AC CHARACTERISTICSStandard Operating Conditions: VDDREG=VDDIO=AVDD 1.71V to 3.63V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
RMII AC TIMING Requirements
ET_29tREFCLKReference Clock PeriodNote 1 nsVDDIO = 3.3V with CLOAD = 20 pF
ET_31tREFCLKIHReference Clock High TimetREFCLK / 2ns
ET_33tREFCLKILReference Clock Low TimetREFCLK / 2ns
ET_35REFCLKDCReference Clock Duty Cycle50%
ET_41tRX[1:0]SU tRXERSURXD[1:0], RXER Set-up time4ns
ET_43tRX[1:0]HOLD tRXERHOLDRXD[1:0], RXER hold time0ns
ET_45tTX[1:0]VAL tTXENVALTX[1:0], TXEN valid time910ns
Note:
  1. 40ns, (i.e. 25 MHz), for 100BASE-TX operation, 400ns, (i.e. 2.5 MHz), for 10BASE-T operation. Clock source ≤ 50ppm. Clock accuracy and stability requirements will depend on performance targets and certification requirements.