901 CRC-8 CCITT

901 : CRC-8 CCITT

  • Author: Aiden Fox Ivey
  • Description: A simple parallel implementation of CRC-8 following CCITT specs. This implies 0x00 is the start value.
  • GitHub repository
  • GDS submitted
  • HDL project
  • Extra docs
  • Clock: 0 Hz

How it works

ui should have the two bytes you want added to the CRC8. If you want to restart the internal CRC value, then pull rst_n low. That will set it back to the default 0x00. enable should be high unless you want to ignore the new calculated value from the specific clock cycle. You can add any number of two byte combinations to it and it will calculate the CRC8 CCITT value for the given combination.

https://crccalc.com can help you calculate the CRC8 if you want.

The specific polynomial in this case is 1+x^1+x^2+x^8.

How to test

Run make in the /test directory.

External hardware

None required! The design is combinational, requiring only a small buffer to store the current CRC value. As a result, it’s quite simple.

IO

# Input Output Bidirectional
0 CRC input pin 0. CRC output pin 0. Represents whether or not to ingest the values on ui to the CRC.
1 CRC input pin 1. CRC output pin 1.
2 CRC input pin 2. CRC output pin 2.
3 CRC input pin 3. CRC output pin 3.
4 CRC input pin 4. CRC output pin 4.
5 CRC input pin 5. CRC output pin 5.
6 CRC input pin 6. CRC output pin 6.
7 CRC input pin 7. CRC output pin 7.

Chip location

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