49.30 GMAC Electrical Specifications

Table 49-39. RMII ETHERNET Module AC Electrical Specifications
AC CharacteristicsStandard Operating Conditions: VDD33 = VDDIO = AVDD = 1.9–3.6V (Unless Otherwise Stated)

Operating Temperature:

-40°C ≤ TA ≤ +125°C for Extended Temperature

Parameter NumberSymbolCharacteristicsMin.Typ.Max.UnitsConditions
MDC/MDIO AC Timing Requirements
ET_1atMDIOSUMDIO Set-up Time22nsCLOAD = 10 pF
ET_3atMDIOHOLDMDIO Hold Time0ns
ET_5atMDIOVALMDIO OUTPUT Valid Time0.49.2ns
ET_6tMDCcycMDC CLK period(1)400ns
RMII AC Timing Requirements
ET_29tREFCLKReference Clock Frequency50MHzCLOAD = 10 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 time2.5ns
ET_45tTX[1:0]VAL tTXENVALTX[1:0], TXEN output valid time512nsVDDIO = 3V, CLOAD = 10 pF
516nsVDDIO = 1.9V, CLOAD = 10 pF
Note:
  1. The max MDC Clock is achieved using 80 MHz EPLL clock as system clock.
  2. These parameters are characterized, but not tested in manufacturing.