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# VH6501 Segment Length Calculation

Last updated: 2020-01-08
Question:

How can I calculate the segment length for VH6501 disturbance interface based on CAN bit rate?

Example calculation for CAN bus bit rate of 500 kbit/s:

1 FPGA tick of the VH6501 Hardware takes 6.25 ns (nanoseconds), which leads with a bit rate of 500 kbit/s to a bit time of 2 µs:

Bit time calculation:
bit time = 1 / bit rate = 1 / 500 kbit/s = 0.002 ms = 2µs

Segment length calculation:
Segment length = bit length / tick length = 2 µs / 6.25 ns = 2000 ns / 6.25 ns = 320

The segment length in VH6501 is 320 given a bit rate of 500 kbit/s.

In CAPL this can be implemented as follows:
result = sequence.AppendToSequence(320, 'R');   // AppendToSequence(word segmentLength, char segmentValue);

Note:

The above calculation is applicable only for VH6501 CAN disturbance interface.

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2020-01-08
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