Functional Description
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When used as a parallel printer port, the five status pins function as: Printer
Acknowledge (ACK), Printer Fault (FAULT
∗
), Printer Busy (BSY),
Printer Select (SELECT), and Printer Paper Error (PE); while the control
pins act as Printer Strobe (STROBE
∗
), and Input Prime (INP
∗
).
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 Programmer’s Reference Guide for drawings of the printer
port interface connections.
Ethernet Interface
The MVME177P uses the Intel 82596CA LAN coprocessor to implement
the optional 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 MVME177P that is built with an Ethernet interface is assigned an
Ethernet Station Address. The address is $0001AFxxxxxx where xxxxxx is
the unique 6-nibble number assigned to the board (i.e., every MVME177P
has a different value for xxxxxx).
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 BBRAM configuration area. That is,
0001AFxxxxxx is stored in the BBRAM. The upper four bytes (0001AFxx)
are read at $FFFC1F2C; the lower two bytes (xxxx) are read at
$FFFC1F30. The MVME177P debugger has the capability to retrieve or
set the Ethernet address.
If the data in BBRAM is lost, use the number on the label on backplane
connector P2 to restore it.
Summary of Contents for MVME177P
Page 1: ...MVME177P Single Board Computer Installation and Use V177PA IH1 Edition of October 2000 ...
Page 10: ...x ...
Page 12: ...xii ...
Page 14: ...xiv ...
Page 34: ...1 16 Computer Group Literature Center Web Site Hardware Preparation and Installation 1 ...
Page 48: ...2 14 Computer Group Literature Center Web Site Startup and Operation 2 ...
Page 92: ...C 2 Computer Group Literature Center Web Site Network Controller Data C ...
Page 98: ...D 6 Computer Group Literature Center Web Site Disk Tape Controller Data D ...
Page 108: ...Index IN 6 Computer Group Literature Center Web Site I N D E X ...