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4 - 3 - 7 •
Network Command
To perform tne network check, it is necessary to connect
a test jig (ethernet transceiver) to the NETWORK port on
the rear panel.
The buffer memory cneck determines whether read/write
operations witn tne buff er memory used for senaing and receiv-
ing network signals can De performed correctly.
The methods used
by
the data line, byte access, word
access, long access and address line checks are identical to
those described in the "Main Memory command" section.
The LANCE (Am7990) initialize check initializes the
LANCE (Am7990) and confirms that an initialization complete
interrupt is generated.
The internal loopoack cneck sends oata over the network
via tne ethernet transceiver and determines tests whether the
same uata can tnen be received correctly.
In the CRC logic cneck, data to which a CRC calculated
in software nas been appended is sent and, after it is
received again, a CRC is again calculated in software.
The
two CRCs should agree.
Next, data to which a CRC calculated
in hardware has been appended is sent.
The CRC is then
calculated in software after the data nas been received again
and tne two CRCs compared to see if tney agree.
Tne collision anJ retry logic check sets the flag wnich
indicates a LANCE collision anu determines whether a reset is
properiy tr199erea.
4-10
NWS-1510/1530/1580
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