Re: [bluetooth] FH Selector implementaion query...

[Alban Villain <Alban.Villain@inventel.fr>]

At 04:46 13/05/2003 -0100, ccsin@k7mail.com wrote:
> Hi all,
>
> I am facing some problem on FH selector.
>  
>  
> 1.Are Y1 and Y2 1-bit input??If yes,how come the CLK1 * 32 (this might
> need 6-bit 
> input)?

Yes, they are 1 bit values. But I guess you can implement it the way you
want internally...
All that matter is that you add 32 to PERM5_OUT+E+F when Y2=1 and 0 when
Y2 is 0.

> 2. Does the Y1 input need to be
> appended to 5-bit before xor with input C??
>
>   Example: if Clk1=1,
>            then Y1 =
> "11111" xor C

You're right. 
If you look at the spec 1.1 Feb. 2001, page 130, you can see "P(i+9)
correspond to C(i) xor Y1".

> 3. What about the case for 
> Y2,
>   example: if Clk1 =1
>            then Y2 =
> "100000"
>             Adder2
> = E[6:0] + F[6:0] + PERM5_out[4:0] + 6'100000
>
>  Is the Y2 input for the Adder2 correct???

I'm not familiar with the notation 6'100000, but I guess it is a 6 bits
value.
For me it is correct.
However, you have to take care that ( PERM5_OUT + E + F + Y2 ) can take
values from 0 to 317 and therefore the intermediate value, taken before
the mod 79 operation needs to be coded using 9 bits.

> Hope someone can help
> me.

Hope I've done

Best regards,
Alban

Alban Villain

Inventel - http://www.inventel.com
Paris

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