Micrel, Inc.
RGMII Signal Diagram
The KSZ9031RNX RGMII pin connections to the MAC are shown in Figure 4.
KSZ9031RNX
Figure 4. KSZ9031RNX RGMII Interface
RGMII Pad Skew Registers
Pad skew registers are available for all RGMII pins (clocks, control signals, and data bits) to provide programming options
to adjust or correct the timing relationship for each RGMII pin. Because RGMII is a source-synchronous bus interface, the
timing relationship needs to be maintained only within the RGMII pin’s respective timing group.
• RGMII transmit timing group pins: GTX_CLK, TX_EN, TXD[3:0]
• RGMII receive timing group pins: RX_CLK, RX_DV, RXD[3:0]
May 14, 2015
23
Revision 2.2