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Fixed point number format in C6748

Sherry Ismail
Intellectual 885 points

Is the 32 bit and 64 bit fixed point number format in Excess-32 or Two complement: with 31st bit signed and 30....0 bits magnitude?

  • 0
    TI__Mastermind 43955 points

    Hi Sherry,

    [quote user="Sherry says"] Is the 32 bit and 64 bit fixed point number format in Excess-32 or Two complement: with 31st bit signed and 30....0 bits magnitude? [/quote ]

    Please  visit :

  • 0 in reply to Shankari G
    Intellectual 885 points

    Hi Shankari

    This document does not tell about fixed point handling of C67x. it only tabulates SP and DP floating point handling with 24 bit mantissa and 8 bit exponent.

  • 0
    TI__Guru* 84110 points
    Sherry,

    Our fixed-point format is Two's complement, which is not the same as "with 31st bit signed and 30....0 bits magnitude".

    There are numerous explanations of Two's complement on the web, from Wikipedia to Stackoverflow. They use a lot of different ways to explain the same thing. One of those descriptions should help you better than anything I could do other than cut-and-paste. But here is my quantitative method of explaining the format:

    0x00000001 = 1(decimal)
    0x00000000 = 0(decimal)
    0xFFFFFFFF = -1(decimal)

    Regards,
    RandyP