EZ801905050MOD Datasheet, PDF (18/36 Pages) Zilog, Inc. – eZ80190 Module is a compact, high-performance Ethernet module

eZ801905050MOD
eZ80190 Module Product Specification
13
An RJ45 loopback connector can be used to verify the correct operation of the
Receiver and the Transmitter. The green LED should be on if RX+ is connected
with TX+ and RX– is connected with TX–.
Ethernet Connector
The eZ80190 is equipped with an RJ45 connector that features integrated mag-
netics (transformer, common mode chokes). The remaining pins on the onboard
RJ45 connector are not connected.
Node assignments for the RJ45 Ethernet connector are shown in Table 3.
Table 3. Ethernet Connector Pin Assignments
Pin Function
1
TX+
2
TX–
3
RX+
6
RX–
Node assignment, in contrast to hub assignment, means that a straight-through
cable (equivalent pin numbers on both sides of the cable are connected to each
other) is used to attach the board to an Ethernet hub or switch. To connect the
eZ80190 Module directly to another node (e.g., a personal computer), a crossover
cable must be used.
The EMAC can be additionally protected by placing a U9 ESD protection array on
the module. This array can be either of the LCDA15C-6 (Semtech) or ESDA25B1
(ST Microelectronics) devices.
GPIO Pins for Enabling LAN Activity, Sleep, Interrupt
GPIO input bit PD4 serves as an active High interrupt input for the EMAC’s
INTRQ0 output.
GPIO output bit PD7 can be used to place the EMAC into SLEEP mode. In
SLEEP mode, the CS8900 draws less current, because only the receiver is oper-
ating. A zero-Ohm resistor at position R14 on the eZ80190 is required for this
function. In this case, the PD6 pin is not available for GPIO on the I/O connector.
If LAN activity is detected, the LANACT signal is pulled Low. The LANACT is con-
nected to GPIO input PD6 and can be used in interrupt edge-detection mode to
wake up and reinitialize the Ethernet chip. A zero-Ohm resistor at position R15 on
PS019101-1003
PRELIMINARY
Ethernet Media Access Controller