Tektronix VX4802, User Manual

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Appendix E: Performance Verification
A–34
VX4802
3. Using the following steps, verify a data byte transfer (AA hexadecimal) from
the VX4801 (byte 3) to the VX4802 (byte 5) using the Data Ready (DRD)
and Data Acknowledge (DAK) handshake lines:
a. Set the VX4801 mode for bytes 2 (handshake) and 3 (data) to be active
high outputs, with byte 3 initialized to a Load Output data value of AA,
and set all tri-states to be inactive:
b. Set the VX4802 for a positive edge handshake, to update the output data
on receipt of a DRD strobe, to update the input data on receipt of a DRD
strobe, and for byte 5 to be an active high input with its tri-state inactive
(note that after the data is strobed in with DRD from the slave, the
VX4802 will in turn generate the DAK):
r;p*+;urd;m5ih;t5i
c. Send a byte 5 input command to the VX4802, and verify that a response
of N, indicating that the module is waiting for a DRD strobe:
(Observe N; waiting for DRD strobe)
d. Set the VX4801 to send a DRD strobe (byte 2, bit 2) and then verify that
the VX4802 DAK light is off:
(Send DRD to VX4802; observe DAK light off)
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