Technical data

Note: SMI diagnosis interface pins are alternatively used as local bus interface or trace pins; in this table the

I/O type is listed for the SMI diagnosis function

(3) MDI Interface

The media dependent interface (MDI) is the PHY’s data communication interface to the Ethernet net-

work in 10BASE-T, 100BASE-TX or 100BAE-FX mode. It is partly analog and partly digital; the

circuitry that is connected to the MDI interfaces must be carefully selected. Proposals can be found in

Chapter

1.6.

Table 7 shows the MDI interface signals arranged for the various supported operation modes.

Pin Name I/O Function Operation mode

P(2:1)TxN O Differential transmit data output

P(2:1)TxP O Differential transmit data output

P(2:1)RxN I Differential receive data input

P(2:1)RxP I Differential receive data input

10BASE-TX

100BASE-TX

P(2:1)TDxN O Differential FX transmit data output

P(2:1)TDxP O Differential FX transmit data output

P(2:1)RDxN I Differential FX receive data input

P(2:1)RDxP I Differential FX receive data input

P(2:1)SDxN I Differential FX signal detect input

P(2:1)SDxP I Differential FX signal detect input

100BASE-FX

Table 7: MDI Interface Signals

(4) System control register interface

A few general controls for the PHYs can be directly set via a subset of the system control registers that

are described in \1\Chapter 4.8.

• select the reset source for the PHYs

• enable auto-MDIX mode

• select the initial start up mode of the PHY, after they have been reset

• enable 100BASE-FX mode

• enable PHYs and release them from power down mode

• check operation status of PHYs

(5) Status LED Outputs

Each PHY provides six status LED outputs; four of these can be made simultaneously available on

GPIO(7:0). The following status can be visualized in parallel:

P1/2_DUPLEX_N Half duplex, full duplex

P1/2_SPEED_N 10BASE-T, 100BASE-TX, 100BASE-FX

P1/2_LINK_STATUS_N Link up, link down

P1/2_ACTIVITY_N Receive activity, transmit activity, no activity

Technical data subject to change Version 1.0.0