Re: [bluetooth] Comments on RF interface

[Jamil Khatib <jamilkhatib75@yahoo.com>]

Hi,
So this means that our suggested RF interface should
wrok with the Slicide RF chip. Anyhow I suggested that
the RF bridge clock should be between 10-20MHz which
should be sufficuent to operate your SPI interface.

The RF interface is described at
http://www.opencores.org/cores/bluetooth/BBspec.shtml

Regards
Jamil Khatib
--- Jørgen Kragh Jakobsen <jkj@silicide.dk> wrote:
> Hi
> I'm working on a RF front end from Silicide. We have
> chosen to implement
> a low
> pin count serial interface only. The front end is
> controlled by register
> parameter
> values and front end state.
> Basically the device has a control mode for setting
> up the Tx/Rx chain
> parameter values
> and is put in either Tx or Rx mode.
> All we need on the baseband controller side is a SPI
> capable of writing
> 16 bits to one of 63
> addresses within 2-3 usec. In Tx/Rx mode the data
> bits is driven at the
> data rate on the
> same interface. This feature calls for some extra
> circuit on the
> baseband SPI side but
> should be basic stuff.
> As I see the current RF interface suggestion I guess
> a interface wrapper
> to our front end
> can be done if the SPI write data rate of 16 bits in
> 2-3 uSec. will
> hold.
> The 7 bit hop frequency signal will be rather front
> end dependend and
> needs a table look
> up / translation to fit from one RF chip frequency
> plan to another.
> 
> Considering the rest of the baseband implementation
> i will suggest to
> open a HW/SW split
> argumentation to get a good starting point for the
> project.
> 
> Regards
> Jørgen Kragh Jakobsen
> Asic Designer, Silicide Microelectronics
> 
> 
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