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Appendix E: Performance Verification
VX4802
A–33
2. Using the following steps, verify a data byte transfer (55 hex) from the
VX4802 (byte 5) to the VX4801 (byte 3) using the Ready for Data (RFD)
from the VX4801 and the Data Valid (DAV) from the VX4802:
a. Set the VX4802 for a positive edge handshake, to update the output data
on receipt of a Ready For Data (RFD) strobe, to update the input data on
receipt of a Data Ready (DRD) strobe, and for byte 5 to be an active high
output, initialized with a Load Output data value of 55 (hex), and with
the tri-state inactive:
b. Set the VX4801 mode for byte 2 to be an active high output (for
assertion of RFD), for bytes 1 and 3 to be active high inputs (byte 1 to
detect DAV and byte 3 to input data), and for all tri-states to be inactive:
c.
Set the VX4801 to input byte 1 (with all bits masked except bit 1) and
byte 3 (data) and verify that DAV is un–asserted (i.e. byte 1, bit 0 = 0)
and consequently, that there is no data (byte 3 = 00):
(Observe: 0000 and VX4802 DAV light off)
d. To assert RFD to the VX4802, set the VX4801 to load byte 2 with an
Output Data value of 01 (asserts RFD to the VX4802) and verify that the
VX4802 correspondingly asserts DAV:
(Observe: VX4802 DAV light on)
e.
Set the VX4801 to input bytes 1 and 3 and verify receipt of DAV (byte 1
bit 1 = 1) and data (byte 3 = 55):
(Observe: 0155 return value)
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Summary of Contents for VX4802
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