Phytec phyCORE-i.MX 6, Руководство по оборудованию

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phyCORE
®
-i.MX 6 [PCM-058]
38 ©
PHYTEC Messtechnik GmbH 2016 L-808e_2
9.4.4 RMII Interface
In order to use an external Ethernet PHY instead of the on-board GbE PHY at U2 the RMII
interface (ENET) of the i.MX 6 is brought out at phyCORE-Connector X1.
Caution!
The GbE PHY (U2) must not be populated on the module if the RMII interface is used.
Note:
In order to have the same signal level at all pins when using the RMII interface jumper J1
should be closed at 2+3. Closing jumper J1 at 2+3 connects the i.MX 6's power input
NVCC_ENET (voltage domain VDD_ENET_IO) to VDD_3V3_LOGIC (3.3
V) instead of
VDD_ETH_IO (2.5 V) ( Table 7 ).
Pin # Signal ST Voltage Domain Description
X1A65 X_ENET_REFCLK I VDD_3V3_LOGIC ENET RMII reference clock
X1A67 X_ENET_TXER O VDD_3V3_LOGIC ENET MII transmit error
X1A68 X_ENET_RXD0 I VDD_ENET_IO ENET RMII receive data 0
X1A69 X_ENET_RXD1 I VDD_ENET_IO ENET RMII receive data 1
X1A70 X_ENET_RX_ER I VDD_ENET_IO ENET RMII receive error
X1B19 X_ENET_MDIO I/O VDD_ENET_IO ENET management data I/O
X1B20 X_ENET_MDC O VDD_ENET_IO ENET management data clock
X1B66 X_ENET_CRS_DV I VDD_ENET_IO ENET RMII RX enable
X1B67 X_ENET_TX_EN O VDD_ENET_IO ENET RMII TX enable
X1B69 X_ENET_TXD0 O VDD_ENET_IO ENET RMII transmit data 0
X1B70 X_ENET_TXD1 O VDD_ENET_IO ENET RMII transmit data 1
Table 16: Location of the RMII Interface Signals