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Bit-band data size clarification

Wei Zhang
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  • Arm Employee Badge
    Note: This was originally posted on 17th August 2011 at http://forums.arm.com

    Another situation that would be useful to use 8-bit or 16-bit size:
    If the bit band memory / device is on an external bus with 8-bit / 16-bit data, then using 8-bit or 16-bit transfer will be faster. Otherwise each 32-bit size bit band alias write operation will be convert to two 32-bit transfers, and each of them have to be converted to multiple 8-bit or 16-bit transfers, it can take quite a bit of time.
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  • Arm Employee Badge
    Note: This was originally posted on 17th August 2011 at http://forums.arm.com

    Another situation that would be useful to use 8-bit or 16-bit size:
    If the bit band memory / device is on an external bus with 8-bit / 16-bit data, then using 8-bit or 16-bit transfer will be faster. Otherwise each 32-bit size bit band alias write operation will be convert to two 32-bit transfers, and each of them have to be converted to multiple 8-bit or 16-bit transfers, it can take quite a bit of time.
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