John,
Thanks for your advice and for sharing your experience. We had a bad
experience with the development board (in other respects) so I didn't
want to "borrow" any parts of their design without checking other
people's experiences.
Thanks
Peter
John Adair wrote:
> We use the ICS8442 and it has a very good jitter specification which is good
> for applications like RocketIO. When you are looking at this kind of
> specification there are not many devices as good as the ICS8442 especially
> if you want to use LVDS. The device is fairly layout sensative so do take
> care in that area of it but that's not unusual in this type of device.
>
> "Peter Mendham" <petermendham@NOCANNEDMEAT.computing.dundee.ac.uk> wrote in
> message news:eaq928$5j8$1@dux.dundee.ac.uk...
>> <snip>
>> a ICS8442 low jitter LVDS frequency synthesizer. Does anyone have
>> any suggestions or advice? Can/Should I use the same device? Is this a
>> wild goose chase?
Reply by John Adair●August 2, 20062006-08-02
Peter
We use the ICS8442 and it has a very good jitter specification which is good
for applications like RocketIO. When you are looking at this kind of
specification there are not many devices as good as the ICS8442 especially
if you want to use LVDS. The device is fairly layout sensative so do take
care in that area of it but that's not unusual in this type of device.
John Adair
Enterpoint Ltd. - Home of Broaddown4. The Ultimate Virtex-4 Development
Board.
http://www.enterpoint.co.uk
"Peter Mendham" <petermendham@NOCANNEDMEAT.computing.dundee.ac.uk> wrote in
message news:eaq928$5j8$1@dux.dundee.ac.uk...
> Dear all,
>
> I'm in the early stages of designing a board with a Virtex-4 FX on it
> which we are planning to use for development involving RocketIO. The
> other guys on the team have stated that it would be "really useful" to
> have the clock for the RocketIO fed from a programmable oscillator. We
> have a Virtex-II FX development board that has a similar arrangement,
> using a ICS8442 low jitter LVDS frequency synthesizer. Does anyone have
> any suggestions or advice? Can/Should I use the same device? Is this a
> wild goose chase?
>
> TIA
>
> Peter
Reply by Peter Mendham●August 2, 20062006-08-02
Dear all,
I'm in the early stages of designing a board with a Virtex-4 FX on it
which we are planning to use for development involving RocketIO. The
other guys on the team have stated that it would be "really useful" to
have the clock for the RocketIO fed from a programmable oscillator. We
have a Virtex-II FX development board that has a similar arrangement,
using a ICS8442 low jitter LVDS frequency synthesizer. Does anyone have
any suggestions or advice? Can/Should I use the same device? Is this a
wild goose chase?
TIA
Peter