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Can anybody explain the CRC calculation method using Polynomial and seed value?

Karthikeyan Kasi Vishwanathan
Expert 1265 points

Hi TI,

Can anybody explain the procedure followed in the following diagram.? I really can not find anything meaningful from this?

Or else Please explain the steps to calculate the CRC value using the Polynomial and Seed value and Message?


Expecting a good guidance to understand this.


Thanks in advance.

Regards,

Karthikeyan.K

  • 0
    Genius 4130 points

    Hi Karthikeyan,

    Richard's post here e2e.ti.com/.../104764 contains a lot of information on the CRC mechanism. Have a look and see if it helps.

    Regards, Tony

  • 0 in reply to Tony Morrell
    TI__Guru 69050 points

    For N2HET - you need to serialize the CRC algorithm in the SENT standard - because of memory limitations.

    Here's a program I used a while back to compare the parallel algo from the standard w. it's serialized version:

    2311.crc.cpp

    Here's HET code for the CRC:

    CRC4_SEED .equ 05h
CRC4_POLY .equ 0Dh
    MOV32 {type=IMTOREG, reg=T, data=0, hr_data=8h}
CRC4:
ADD {src1=R, src2=R, dest=R, data=DUMMY}
AND {src1=S, src2=T, dest=NONE}
BR {event=Z, cond_addr=CRC4_a}
OR {src1=R, src2=IMM, dest=R, data=0, hr_data=1h}
CRC4_a:
AND {src1=R, src2=IMM, dest=NONE, data=0, hr_data=10h}
BR {event=Z, cond_addr=CRC4_b}
XOR {src1=R, src2=IMM, dest=R, data=0, hr_data=CRC4_POLY}
CRC4_b:
AND {src1=R, src2=IMM, dest=R, data=0, hr_data=0Fh}
ADD {src1=T, src2=ZERO, dest=T, smode=LSR, scount=1, data=DUMMY}
BR {event=NZ, cond_addr=CRC4}

    Sorry for the bad indentation - copied it out of a PDF file.