Ethernet Interface - Motorola MVME187 Installation Manual

The PCCchip2 provides an auto-strobe feature similar to that of the
MVME147 PCC.

Ethernet Interface

The 82596CA implements the Ethernet transceiver interface. The
82596CA accesses local RAM using DMA operations to perform its
normal functions.
The Ethernet transceiver interface is located on the MVME187, and
the industry standard connector is located on the MVME712X
transition module.
Every MVME187 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 MVME187 has a different
value for xxxxx).
Each module has the 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 MVME187 debugger has the capability to retrieve or set the
Ethernet address.
If the data in the BBRAM is lost, the user should use the number on
the VMEbus P2 connector label to restore it.
In auto-strobe mode, after a write to the Printer Data Register,
the PCCchip2 automatically asserts the STROBE* pin for a
selected time specified by the Printer Fast Strobe control bit.
In manual mode, the Printer Strobe control bit directly
controls the state of the STROBE* pin.
At an address of $FFFC1F2C, the upper four bytes (08003E2x)
can be read.
At an address of $FFFC1F30, the lower two bytes (xxxx) can
be read.
Functional Description
2-21
2