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i.MX RT1050 RMII Reference Clock

Question asked by Peter Baston on Jan 21, 2019
Latest reply on Jan 23, 2019 by Fang Li


According  to the i.MX RT1050 Processor Reference Manual, Rev. 2, the signal ENET_REF_CLK (on pad GPIO_B1_10) is an input in RMII mode. See Table 40-2. ENET External Signals.

Looking at the IMXRT1050-EVKB schematics, however, this signal seems to be an output from the processor, signal name ENET_TX_CLK, which is used to clock the PHY.

Can anybody please explain this apparent difference in documented signal direction.

Thanks for your help,

Pete Baston.