KSZ8864 Evaluation Board User’s Guide
Micrel Inc.
Page 11
5/9/2014
connects to the port 3 MAC3 in the KSZ8864, and we refer to this as the port 3 Switch
SW3-MII/RMII port. Both the SW4-MII and the SW3-MII are default available as PHY modes.
SW4-MII can be configured to MAC mode by setting pin [47, 48] =11 and SW3-MII can be
configured to MAC mode by setting bit 6 = ‘1’ in the register 223. Both MAC4 and MAC3 also can
be configured to RMII interfaces mode for SW4-RMII and SW3-RMII by the strap pins P1LED0
and P2LED0, P1LED0 is pulled down (JP39 closed) for SW4-RMII mode, P2LED0 is pulled down
(JP42 closed) for SW3-RMII mode.
The Switch MII port can be set to PHY mode, MAC mode. In PHY mode of the SW4-MII, the
Switch MII port will transmit and receive signals on J6 of the board’s male MII connector. This
mode is usually used to connect the KSZ8864 to a CPU. In MAC mode of the SW4-MII, the Switch
MII port will transmit and receive signals on J7 of the board’s female MII connector. This interface
is normally used to connect the KSZ8864 to an external PHY. In PHY mode of the SW3-MII, the
Switch MII port will transmit and receive signals on J8 of the board’s male MII connector. This
mode is usually used to connect the KSZ8864 to an external MAC. In MAC mode of the SW3-MII,
the Switch MII port will transmit and receive signals on J9 of the board’s female MII connector.
This interface is normally used to connect the KSZ8864 to an external PHY.
Table 6 SCONF [1:0] pin [47, 48] for SW4-MII PHY/MAC mode
JP11
Pin 47
JP10
Pin 48
Switch SW4-
MII
Open
Open
SW4-MII PHY mode
(Default)
Open
Close
Disabled
Close
Open
Disabled
Closed
Close
SW4-MII MAC mode
4.6.1 Port 4 SW4-MII Jumper Configuration
Modes JP10 JP11 JP39 JP17 JP18
SW4-MII
MAC Mode
with J7 used
Close Close Open
(default for
SW4-MII)
Pin 2-3 Close Pin 1-2 Close
SW4-MII
PHY Mode
with J6 used
Open
(default for
PHY mode)
Open
(default for
PHY mode)
Open
(default for
SW4-MII)
Pin 2-3 Close Pin 1-2 Close
Table 7 Configure for SW4-MII
