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Functional Description
The PCCchip2 provides an auto-strobe feature similar to that of the MVME147 PCC.
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.
Refer to the MVME166/MVME167/MVME187 Single Board Computers
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Programmer's Reference Guide for drawings of the printer port interface connections.
Ethernet Interface
The 82596CA is used 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 MVME167 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 MVME167 has a different value for XXXXX).
Each module 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. 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. Refer to
the BBRAM, TOD Clock memory map description in Chapter 3. The MVME167
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.
The Ethernet transceiver interface is located on the MVME167 main module, and the
industry standard connector is located on the MVME712X transition module.
Support functions for the 82596CA are provided by the PCCchip2. Refer to the
82596CA user's guide and to the MVME166/MVME167/MVME187 Single Board
Computers Programmer's Reference Guide for detailed programming information.
SCSI Interface
The MVME167 provides for 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.
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MVME167 Single Board Computer User's Manual
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