KSZ9031RNX-EVAL Board User’s Guide
Micrel, Inc.
August 17, 2012
Rev.
1.1
12/22
4.5.2
RGMII Connection to GMAC
The KSZ9031RNX-EVAL board exposes the RGMII signals at the following series termination
(49.9 Ohm) / jumper (0 Ohm) resistor locations, as indicated in the following table.
Resistor
(PCB location)
KSZ9031RNX-EVAL
Signal Name
RGMII
Signal Name
(per spec)
R14 left pad
(PCB – top side)
RX_CLK RXC
R16 left pad
(PCB – top side)
RX_DV RX_CTL
R136 left pad
(PCB – top side)
RXD0 RXD0
R137 left pad
(PCB – top side)
RXD1 RXD1
R138 left pad
(PCB – top side)
RXD2 RXD2
R139 left pad
(PCB – top side)
RXD3 RXD3
R18 top pad
(PCB – bottom side)
GTX_CLK TXC
R17 left pad
(PCB – top side)
TX_EN TX_CTL
R143 top pad
(PCB – bottom side)
TXD0 TXD0
R142 top pad
(PCB – bottom side)
TXD1 TXD1
R141 top pad
(PCB – bottom side)
TXD2 TXD2
R140 top pad
(PCB – bottom side)
TXD3 TXD3
Table 6. RGMII Signals access at series termination / jumper resistor locations
Resistors [R14, R16, R136-R139] for the RGMII output clock and signals and the corresponding
resistors [R18, R17, R143, R142, R141, R140] for the RGMII input clock and signals can be
removed to open the RGMII Loop Back path and allow the RGMII signals (in the above table) to
be wired to a GMAC on another board for evaluation and testing.
4.6 USB
Port
The USB port (CN1) provides programming access to the KSZ9031RNX device’s PHY registers
through its MDC/MDIO management pins.
See following software section for PHY register access.
