49.30 GMAC Electrical Specifications

Table 49-39. RMII ETHERNET Module AC Electrical Specifications
AC Characteristics			Standard Operating Conditions: VDD33 = VDDIO = AVDD = 1.9–3.6V (Unless Otherwise Stated) Operating Temperature: -40°C ≤ TA ≤ +125°C for Extended Temperature
Parameter Number	Symbol	Characteristics	Min.	Typ.	Max.	Units	Conditions
MDC/MDIO AC Timing Requirements
ET_1a	tMDIO_SU	MDIO Set-up Time	22	—	—	ns	CLOAD = 10 pF
ET_3a	tMDIO_HOLD	MDIO Hold Time	0	—	—	ns
ET_5a	tMDIO_VAL	MDIO OUTPUT Valid Time	0.4	—	9.2	ns
ET_6	tMDCcyc	MDC CLK period⁽¹⁾	400	—	—	ns
RMII AC Timing Requirements
ET_29	tREF_CLK	Reference Clock Frequency	—	50	—	MHz	CLOAD = 10 pF
ET_31	tREF_CLKIH	Reference Clock High Time	—	tREFCLK /2	—	ns
ET_33	tREF_CLKIL	Reference Clock Low Time	—	tREFCLK /2	—	ns
ET_35	REF_CLKDC	Reference Clock Duty Cycle	—	50	—	%
ET_41	tRX[1:0]_SU tRXER_SU	RXD[1:0], RXER Set-up time	4	—	—	ns
ET_43	tRX[1:0]_HOLD tRXER_HOLD	RXD[1:0], RXER hold time	2.5	—	—	ns
ET_45	tTX[1:0]_VAL tTXEN_VAL	TX[1:0], TXEN output valid time	5	—	12	ns	VDDIO = 3V, CLOAD = 10 pF
ET_45	tTX[1:0]_VAL tTXEN_VAL	TX[1:0], TXEN output valid time	5	—	16	ns	VDDIO = 1.9V, CLOAD = 10 pF
Note: The max MDC Clock is achieved using 80 MHz EPLL clock as system clock. These parameters are characterized, but not tested in manufacturing.