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Each board has an Ethernet Station Address displayed on a label attached to the VMEbus P2 connector. In addition, the six bytes including the Ethernet address are stored in the configuration area of the BBRAM. That is, 08003E2xxxxx is stored in the BBRAM. The upper four bytes (08003E2x) are read at $FFFC1F2C; the lower two bytes (xxxx) are read at $FFFC1F30. The MVME172 debugger has the capability to retrieve or set the Ethernet address. If the data in the BBRAM is lost, use the number on the label on backplane connector P2 to restore it. The Ethernet transceiver interface is located on the MVME172LX main board, and the industry standard connector is located on its front panel Support functions for the 82596CA are provided by the MC2chip. Refer to the 82596CA user’s guide and to the MC2chip description in the MVME172 VME Embedded Controller Programmer’s Reference Guide for detailed programming information

Ethernet Interface

 The MVME172LX uses the Intel 82596CA LAN coprocessor to implement the Ethernet transceiver interface. The 82596CA accesses local RAM using DMA operations to perform its normal functions. Because the 82596CA has small internal buffers and the VMEbus has an undefined latency period, buffer overrun may occur if the DMA is programmed to access the VMEbus. Therefore, the 82596CA should not be programmed to access the VMEbus. Every MVME172LX that has an Ethernet interface is assigned an Ethernet Station Address. The address is where xxxxx is the unique 5-nibble number assigned to the board (i.e., every MVME172LX has a different value for xxxxx).

SCSI Interface 

The MVME172LX supports mass storage subsystems through the industry-standard SCSI bus. These subsystems may include hard and floppy disk drives, streaming tape drives, and other mass storage devices. The SCSI interface is implemented using the NCR 53C710 SCSI I/O controller Support functions for the 53C710 are provided by the MC2chip. Refer to the NCR 53C710 user’s guide and to the MC2chip in the MVME172 VME Embedded Controller Programmer’s Reference Guide for detailed programming information

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