KSZ8061MNX Evaluation Board User’s Guide
DS50002449A-page 20
2016 Microchip Technology Inc.
TABLE 2-1:
KSZ8061 CONNECTOR PIN ASSIGNMENTS
2.7
MII CONNECTOR
The MII edge connector J5 provides external access to the KSZ8061 MII bus and the
MII management interface (MDIO/MDC). This connector is typically used to connect
the KSZ8061 PHY to the MAC interface on a Microchip Ethernet switch evaluation
board. Test traffic can then be sent and received through another port on the switch.
This configuration is shown in
. Note that 5V power is not shared across this
connector, so each board must be powered separately.
To use this interface, it is necessary to have 0-ohm resistors R11-R16 and R21-R26
installed. The KSZ8081 also needs to be isolated from the MII bus. The simplest way
to do this is to remove power from the KSZ8081 by removing jumper JP1. Alternatively,
place the KSZ8081 into Isolate mode by installing R70, or remove resistors R211-R216
and R221-R226.
2.8
MII MANAGEMENT INTERFACE (MDIO/MDC)
The MII management interface (MDIO/MDC) can be accessed in two ways. The first is
via the MII connector J5, discussed above. This requires the installation of resistors
R31 and R33. Alternatively, these signals are accessible at the 10-pin header J7,
requiring the installation of resistors R27 and R28. These resistor options are provided
for signal integrity optimization. If signal integrity on this interface is not a problem, then
it is acceptable to leave all four resistors installed.
The default MII management addresses (a.k.a. PHY addresses) are b'001 for the
KSZ8061, and b'011 for the KSZ8081.
2.9
10-PIN HEADER (J7)
Header J7 is intended primarily for access to the MII management interface (MDIO and
MDC signals). The header pins are labeled with color codes for connection to the FTDI
C232HM-DDHSL-0 or C232HM-EDHSL-0 USB-to-MPSSE cable. The two pins labeled
“MDIO” are the same board signal. They are duplicated because the FTDI cable sep-
arates the serial data input and output signals.
, it is possible to power the board through header
J7 instead of the standard power connector J8. The C232HM-EDHSL-0 cable has 5V
available for this purpose. Note that the board cannot be powered from the
C232HM-DDHSL-0 cable which is 3.3V. See
for more details.
This header also provides access to the KSZ8061 reset input signal, and the interrupt
and signal detect output signals. The reset signal goes only to the KSZ8061, and not
to the KSZ8081 nor to the RXER latch and LED.
KSZ8061 Signal
Connector Pin Assignment
RJ-45
TE 1379165-1
Sumitomo
6098-6793
TXP
1
4
10
TXM
2
3
9
RXP
3
2
7
RXM
6
1
6
