KSZ9031MNX-EVAL Board User’s Guide
Micrel, Inc.
August 17, 2012
Rev.
1.0
12/23
4.5 Gigabit Media Independent Interface (GMII)
The KSZ9031MNX-EVAL Board is shipped with the GMII signals configured for GMII Loopback.
Pins 1 and 2 of jumpers [JP14—JP27] are closed to connect the GMII output clock and signals to
their respective GMII input clock and signals. Refer to KSZ9031MNX Evaluation-Socket Board
Schematic for details.
GMII Loopback enables the KSZ9031MNX device to operate on a standalone evaluation platform
without the need of an external GMAC for 1000Mbps mode operation. Gigabit (1000Base-T)
Ethernet traffic from the link partner (Spirent SmartBits 6000B in the following figure) is received
by the KSZ9031MNX device, looped back externally via GMII pins and jumpers [JP14—JP27],
and transmitted back to the link partner.
G
M
II
Lo
op B
a
c
k
Figure 2. KSZ9031MNX-EVAL Board – GMII Loop Back
4.6 Media Independent Interface (MII)
The KSZ9031MNX-EVAL Board provides access to the MII clocks and signals at the MII Port
(J1). Pins 2 and 3 of jumpers [JP14—JP27] are closed to connect the MII clocks and signals from
the KSZ9031MNX device to the MII Port (J1). Similarly, pins 1 and 2 of jumpers [JP6, JP5] are
closed to connect the MII Management pins (MDC, MDIO) from the KSZ9031MNX device to the
MII Port (J1). Refer to KSZ9031MNX Evaluation-Socket Board Schematic for details.
The following figure shows the KSZ9031MNX-EVAL Board attached to Spirent SmartBits
(Ethernet traffic generator/analyzer) for testing. MII Port (J1) provides the 10/100 MAC interface
and plugs directly into the connector of the SX-7210 Module, while the RJ-45 connector (RJ1)
provides the 10/100 copper interface and is connected via CAT-5 Ethernet cable to the SX-7410
Module.
SmartBits
SX-7210
Module
SmartBits
SX-7410
Module
Spirent
SmartBits
2000
Chassis
KSZ9031MNX-EVAL
Board
RJ-45
MII
10Base-T /
100Base-TX
Figure 3. KSZ9031MNX-EVAL Board – MII Interface Connection with Spirent SmartBits
