fido2100 3-Port Industrial Ethernet DLR Switch with IEEE1588
Data Sheet
April 10, 2013
7 External MII Interface
The two external ports, port 1 and port 2, of the 3-Port Industrial Ethernet Switch are connected
to their respective physical layer transceivers (PHY) through an IEEE 802.3 media independent
interface (MII). The MII interface is comprised of 16 pins: transmit clock (px_txc), transmit
enable (px_txen), transmit error (px_txer), transmit data (px_txd[3:0]), receive clock (px_rxc),
receive data valid (px_rxdv), receive data error (px_rxer), receive data (px_rxd[3:0]), collision
(px_col) and carrier sense (px_crs).
7.1 RECEIVE DATA, External MII Interface
An Ethernet packet received by the PHY will be transmitted to its respective port via an MII
interface. The PHY will transmit this data using the MII inputs: px_rxc, px_rxdv, px_rxer and
px_rxd[3:0]. Timing for the RECEIVE DATA is shown below in Figure 12.
Figure 12 External MII Interface, RECEIVE DATA
Table 11 RECEIVE DATA, External MII Interface
Description
Symbol
trxdsu
min max unit
Receive Data SETUP time
Receive Data HOLD time
Receive Data Valid SETUP time
Receive Data Valid HOLD time
Receive Data Error SETUP time
Receive Data Error HOLD time
10
10
10
10
10
10
ns
ns
ns
ns
ns
ns
trxdhd
trxdvsu
trxdvhd
trxersu
trxerhd
42
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