8.2.4 Signal Interfaces
The GMAC includes the following signal interfaces:
- Media interface supports RMII/RGMII and connects to the external PHY
- Management Data Input/Output (MDIO) connects to the external PHY for management
- Configuration interface
- System bus interface for direct memory access (DMA)
- GTSUCOMP signal for TSU timer count value comparison
Signal Name | Function | RMII | RGMII |
---|---|---|---|
GTXCK | Transmit Clock or Reference Clock | REFCK | TXCK |
G125CK | 125 MHz Input Clock | Not Used | 125 MHz Ref Clk |
GTXEN | Transmit Enable | TXEN | TXCTL |
GTX[3:0] | Transmit Data | TXD[1:0] | TXD[3:0] |
GRXCK | Receive Clock | Not Used | RXCK |
GRXDV | Receive Data Valid | CRSDV | RXCTL |
GRX[3:0] | Receive Data | RXD[1:0] | RXD[3:0] |
GRXER | Receive Error | RXER | Not Used |
GMDC | Management Data Clock | MDC | MDC |
GMDIO | Management Data Input/Output | MDIO | MDIO |