57.31 GMAC Electrical Specifications

Figure 57-37. Media-Independent Interface (MII) Ethernet Module Output Access Timings
Figure 57-38. Media-Independent Interface (MII) Receive Ethernet Module Timing Diagrams
Figure 57-39. Media-Independent Interface (MII) Transmit Ethernet Module Timing Diagrams
Table 57-43. Media-Independent Interface (MII) RX/TX Ethernet Module Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO = VDDIN 2.5V to 3.6V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
MII Output TIMING Requirements
ET_1tMDIOSUMDIO Set-up Time10——nsVDDIO = 3.3V with CLOAD = 20 pF
ET_3tMDIOHOLDMDIO Hold Time10——ns
ET_5tMDIOVALMDIO OUTPUT Valid Time0—10ns
MII RX TIMING Requirements
ET_7tRXCLKRXCLK Period—Note 1—nsVDDIO = 3.3V with CLOAD = 20 pF
ET_9tRXCLKHRXCLK High TimetRXCLK / 2——ns
ET_11tRXCLKLRXCLK Low TimetRXCLK / 2——ns
ET_13tRXSU

tRXERSU

tRXDVSU

ERX[3:0], ERXER and ERXDV Set-up Time10——ns
ET_15tRXHOLD

tRXERHOLD

tRXDVHOLD

ERX[3:0], ERXER and ERXDV Hold Time10——ns
MII TX TIMING Requirements
ET_17tTXCLKTXCLK Period—Note 1—nsVDDIO = 3.3V with CLOAD = 20 pF
ET_19tTXCLKHTXCLK High TimetTXCLK / 2——ns
ET_21tTXCLKLTXCLK Low TimetTXCLK / 2——ns
ET_23tTXCOLSU

tTXCRSSU

TXCOL and TXCRS Set-up Time10——ns
ET_25tTXCOLHOLD

tTXCRSHOLD

TXCOL and TXCRS Hold Time10——ns
ET_27tTX[3:0]VAL

tTXERVAL

tTXENVAL

TX[3:0], TXER and TXEN valid times3—25ns—
Note:
  1. 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.
Figure 57-40. Reduced Media-Independent Interface (RMII) Ethernet Module Timing Diagrams
Table 57-44. Reduced Media-Independent Interface (RMII) Ethernet Module Electrical Specifications
AC CHARACTERISTICSStandard Operating Conditions: VDDIO = VDDIN 2.5V to 3.6V (unless otherwise stated)

Operating temperature:

-40°C ≤ TA ≤ +85°C for Industrial

Param. No.SymbolCharacteristicsMin.Typ.Max.UnitsConditions
RMII TIMING Requirements
ET_29tREFCLKReference Clock Frequency—(Note 1)—MHzVDDIO = 3.3V with CLOAD = 20 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

tRXERSU

tCRSDVSU

RXD[1:0], RXER, CRSDV Set-up time4——ns
ET_43tRX[1:0]HOLD

tRXERHOLD

tCRSDVHOLD

RXD[1:0], RXER,CRSDV hold time2——ns
ET_45tTX[1:0]VAL

tTXENVAL

TX[1:0], TXEN valid time2—16ns