Appendix E: Performance Verification
A–30
VX4802
c.
Repeat the previous test with the logic sense reversed; i.e. odd bytes (1,
3, 5) set to active high and the even bytes set to active low. Verify the
complementary response:
(Observe: AA55AA55AA55AA55AA55)
4. To verify the even byte data inputs and the odd byte data outputs, reset the
VX4802 to its power-up state, set the mode for the even bytes (0, 2, 4, 6, 8)
to be active low inputs, for the odd bytes (1, 3, 5, 7, 9) to be active high
outputs initialized with a Load Output value of 55, and set the tri-state
function to be inactive. Perform an input of all bytes and verify an AA55
response on even/odd channels. Finally, reverse the logic sense mode of the
even and odd bytes and verify the complementary response of 55AA:
(Observe: AA55AA55AA55AA55AA55)
(Observe: 55AA55AA55AA55AA55AA)
This test sequence verifies that the internal tri-state commands and the external
tri-state signals are functioning properly for each I/O byte.
NOTE
. The Tri–State test sequence does not apply to VX4802 modules having
Option 02. Modules which do not have Option 02 utilize an internal 22 k
pull-up to +5 V which will appear as a high logic level when in the tri-state
mode.
Equipment
Requirements
Loop-back assembly (item 2)
Prerequisites
All prerequisites listed on page A–22
1. Install the loop-back assembly on the VX4802 under-test and the VX4801 as
shown in Figure 4.
Tri-State Function
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Summary of Contents for VX4802
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