Re: [rohc] sigcomp - meaning of the F bit in the input_bit_order register

[Carsten Bormann <cabo at tzi.org>]

On Apr 13 2005, at 12:48 Uhr, Cristian CONSTANTIN wrote:

> now, if 1 is the right interpretation, then wouldn't P=1 && F=1 cancel
> each other's effect?

No, because P is about the way the bits are taken out of the input 
bytes and F/H are about the way they are assembled to binary numbers.

If you are only ever assembling 8-bit numbers, they do cancel out.

For 16-bit numbers, as you notice, the combination of P and F/H gives 
you a way to do the two different byte orders (which does NOT 
contradict the fact that bytes keep their order when being parsed into 
bits).

For fractional-byte numbers (which tend to straddle input byte 
boundaries), it's best to draw a picture :-)

Gruesse, Carsten


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