Xrm-Eth; Introduction; General Purpose I/O; Rs232 I/O - Alpha Data ADM-XRC-II Pro Hardware Manual

9 XRM-ETH

9.1 Introduction

The XRM-ETH is a general-purpose adaptor for the ADM-XPL and ADM-XRC-II series of PMC modules. It
provides 10/100 Ethernet, RS-232 and general purpose I/O for use with a wide variety of IP.
The XRM-ETH is supplied with two cables to enable connections from the XRM-ETH to 15 way PC COM ports
and RJ45 Ethernet.
XRM-ETH-CAB01 for Ethernet
XRM-ETH-CAB02 for RS232
IMPORTANT. The XRM-ETH REV 1 requires the use of 2.5V signalling over the XRM connector and this
should be checked prior to power up.

9.2 General Purpose I/O

The XRM-ETH provides 18 pairs of differential-capable I/O plus two single-ended signals on a 38 pin Mictor
connector. This connector is compatible with a wide range of Mictor connectors and is well suited to cabling
The differential pairs are routed on the XRM-ETH with 100 Ohm impedance and are not terminated to enable
direct routing to the FPGA. The user has the choice of using Virtex DCI or DT termination schemes to provide
the correct termination for each signal pair. For DCI termination the resistor pairs R1/R2 and R4/R5 should be
set to the appropriate value for the desired termination value. By default these resistors are all 100Ohm. The
DT scheme can only be used with some Virtex-II PRO devices and provides a fixed 100R termination for
LVDS and LDT I/O standards without the power requirement of the DCI option.

9.3 RS232 I/O

The XRM-ETH provides two transmit and two receive RS232 signals that can be used for connection to other
XPLs or PC COM ports. The supplied cable connects TX0 and RX0 to a standard 15 pin connector suitable for
use with a PC. Baud rates up to 115K are supported.
Page 20 of 29
LVDS I/O
3388E
Filter
+3V3
+2V5
PSU
TX data
RX data
systems from Precision Interconnect.
Max
Magnetics
PHY
LEDs
25MHz
ADM-XP User Manual
Mictor-38
RS232
2x5 hdr
Infoport
15w
ADM-XR-IIPro User Manual
Version 0.2