Ethernet media access controller – Zilog EZ80190 User Manual
Page 53
eZ80190 Development Kit
User Manual
UM014108-0810
Operational
Description
49
Ethernet Media Access Controller
The eZ80190 Module contains a CS8900A Ethernet Media Access Con-
troller (EMAC—combines MAC and PHY functions) which is attached
to the data/address bus (A0–A3, D0–D7, RD, and WR) of the processor.
This chip is connected to the processor’s CS3 Chip Select, and to the PD4
pins for interrupt purposes. Connection of pins PD6 and PD7 for
LANACT (wake-up from sleep) and SLEEP is optional and resistor-
selectable onboard (see below). Details about the internal registers of the
CS8900A EMAC can be found on the Cirrus Logic website at
Ethernet LEDs
There are two green LEDs, a Link LED and a LAN LED, that are located
adjacent to each other on the eZ80190 Module. A steady LAN LED (top)
indicates received link pulses from the Ethernet. A flashing Link LED
(bottom) indicates Traffic (RX or TX) on the LAN.
Ethernet Connector
The eZ80190 Module is equipped with an RJ-45 connector that features
integrated magnetics (transformer, common mode chokes). The remain-
ing pins on the onboard RJ-45 connector are not connected.
An RJ-45 loopback connector can be used to verify the correct operation
of the Receiver and the Transmitter. Pin assignments for the RJ-45 Ether-
net connector are shown in Table 26.
Table 26. Ethernet Connector Pin Assignments
Pin
Function
1
TX+
2
TX–
3
RX+
6
RX–