Motorola MVME2400 Series Manuel de service télécharger pdf (Page 70)

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Functional Description

Ethernet Interface

The MVME240x module uses Digital Equipment’s DECchip 21143 PCI

Fast Ethernet LAN controller to implement an Ethernet interface that

supports 10Base-T/100Base-TX connections, via an RJ45 connector on

the front panel. The balanced differential transceiver lines are coupled via

on-board transformers.

Every MVME240x is assigned an Ethernet station address. The address is

$08003E2xxxxx, where xxxxx is the unique 5-nibble number assigned to

the board (i.e., every board has a different value for xxxxx).

Each MVME240x displays its Ethernet station address on a label attached

to the base board in the PMC connector keepout area just behind the front

panel. In addition, the six bytes including the Ethernet station address are

stored in the NVRAM (BBRAM) configuration area specified by boot

ROM. That is, the value 08003E2xxxxx is stored in NVRAM. The

MVME240x debugger, PPCBug, has the capability to retrieve the Ethernet

station address via the CNFG command.

Note The unique Ethernet address is set at the factory and should

not be changed. Any attempt to change this address may

create node or bus contention and thereby render the board

inoperable.

If the data in NVRAM is lost, use the number on the label in the PMC

connector keepout area to restore it.

For the pin assignments of the 10Base-T/100Base-TX connector, refer to

Appendix C.

At the physical layer, the Ethernet interface bandwidth is 10Mbit/second

for 10Base T. For the 100Base TX, it is 100Mbit/second. Refer to the

BBRAM/TOD Clock memory map description in the MVME2400-Series

VME Processor Module Programmer’s Reference Guide for detailed

programming information.

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Motorola MVME2400 Series Manuel de service Page 70