Motorola IH5 User Manual
6-6
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Functional Description
6
Ethernet Interface
MCPN750A provides an Ethernet interface via the 21143 device. This
device, along with an external Level One LXT970ATC device, implement
a 10BaseT/100BaseTX autoselect ethernet interface. The Ethernet
interface is routed to an RJ45 connector located at the front panel of the
board. The MCPN750A SBC also supports optional routing of the ethernet
signals to the J5 connector for ethernet connection on the transition
module. The front panel or transition module option is selected by
installing the corresponding components during board assembly.
device, along with an external Level One LXT970ATC device, implement
a 10BaseT/100BaseTX autoselect ethernet interface. The Ethernet
interface is routed to an RJ45 connector located at the front panel of the
board. The MCPN750A SBC also supports optional routing of the ethernet
signals to the J5 connector for ethernet connection on the transition
module. The front panel or transition module option is selected by
installing the corresponding components during board assembly.
Every board will be assigned an Ethernet Station Address. The address is
$000A1Exxxxx where xxxxx is the unique number assigned to the board.
Each board’s Ethernet Station Address is displayed on a label attached to
the PMC front-panel keep-out area. In addition, the Ethernet address is
stored in the configuration area of the NVRAM specified by the Boot
ROM and in the serial ROM attached to the 21143.
$000A1Exxxxx where xxxxx is the unique number assigned to the board.
Each board’s Ethernet Station Address is displayed on a label attached to
the PMC front-panel keep-out area. In addition, the Ethernet address is
stored in the configuration area of the NVRAM specified by the Boot
ROM and in the serial ROM attached to the 21143.
These bytes are stored in bytes 0x14 through 0x19 in the Ethernet SROM.
The Ethernet information in the SROM is stored in DEC Version 3 format.
For further information on this refer to the Digital Semiconductor 21x4x
Serial ROM Format, Version 3.03 document.
The Ethernet information in the SROM is stored in DEC Version 3 format.
For further information on this refer to the Digital Semiconductor 21x4x
Serial ROM Format, Version 3.03 document.
Use extreme caution when viewing the contents of the Ethernet SROM via
the PPCBug SROM command. If the contents are modified incorrectly,
this could cause the PPCBug Firmware Ethernet Drivers to work
incorrectly.
the PPCBug SROM command. If the contents are modified incorrectly,
this could cause the PPCBug Firmware Ethernet Drivers to work
incorrectly.
Note:
When the board is shipped from the factory, it should contain the
proper SROM data for the MCPN750A, which has
10BaseT/100BaseTX Ethernet connections. There should not be
a need to change the SROM contents.
proper SROM data for the MCPN750A, which has
10BaseT/100BaseTX Ethernet connections. There should not be
a need to change the SROM contents.
For the pin assignments of the 10BaseT/100BaseTX connector, refer to the
. Refer to the BBRAM/TOD Clock memory map
description in the MCPN750A CompactPCI Single Board Computer
Programmer’s Reference Guide (MCPN750A/PG) for detailed
programming information.
Programmer’s Reference Guide (MCPN750A/PG) for detailed
programming information.