How Is the Verdict of CB144 Test Case Defined?

Issue Details

We have some FAILs in CB144 test case that would need further explanation.

Would you give us a hint at how these test verdicts are generated? 

Would these results consider as PASS in a test scenario?

Solution

For each character in the ATQB, all timing intervals calculated shall be equal to (128 * n) 1/fc +/- 2/fc.

Here is one example of the result of a failed test:

Measuring the timing interval of character 12
Character value: 73
Interval 1 = 9.218 µs
Interval 1 = 125.0 1/fc
Interval 1 is not equal to 1 * 128 ± ε

To get a pass, the timing should be between 126 * 1/fc and 130 * 1/fc.

Moreover, if at least one timing is outside of the interval, the whole CB144 test case will fail.

Additional Information

From PICC to PCD, bit boundaries within a character shall only occur at nominal positions of rising or falling edges of the subcarrier: (n × 128) ± 2/fC, with n being the considered integer number of bits since the start bit.

For any additional questions, please contact NI technical support team on ni.com when opening a Service Request using the NI Service Request Manager (SRM).