KSZ9031MNX-EVAL Board User’s Guide
Micrel, Inc.
August 17, 2012
Rev.
1.0
13/23
The Micrel KSZ88xx 3-port Switch evaluation boards have the corresponding 10/100 MII MAC
interface connectors that plug directly into the MII Port (J1) of the KSZ9031MNX-EVAL Board to
provide an end-to-end 10/100 copper to 10/100 copper evaluation platform.
The MII Port (J1) is a 40-pin male edge connector that interfaces with and plugs directly into the
mating AMP 787170-4 (40-pin, right angle, female) connector
The following table lists the pin outs for the MII Port (J1).
Pin #
Signal
Pin #
Signal
1
VCC (NC)
21
VCC (NC)
2 MDIO
22
Ground
3 MDC
23
Ground
4 RXD3
24
Ground
5 RXD2
25
Ground
6 RXD1
26
Ground
7 RXD0
27
Ground
8 RX_DV
28
Ground
9 RX_CLK
29
Ground
10 RX_ER
30 Ground
11 TX_ER
31 Ground
12 TX_CLK
32 Ground
13 TX_EN
33 Ground
14 TXD0
34 Ground
15 TXD1
35 Ground
16 TXD2
36 Ground
17 TXD3
37 Ground
18 COL
38 Ground
19 CRS
39 Ground
20 VCC
(NC)
40 VCC
(NC)
Table 6. MII Port (J1) – MII Pin Definition
4.7 USB
Port
The USB port (CN1) provides programming access to the KSZ9031MNX device’s PHY registers
through its MDC/MDIO management pins.
See following software section for PHY register access.
