Why do you want to tri-state the LVDS outputs?
"tentacle" <onlyspam@online.ms> wrote in message
news:3ebd3$45708bb0$54964b97$1398@nf16.news-service.com...
> Hi Rob,
>
> I know that I have to use the assigment editor to change the output type
> from LVTTL
> (default) to LVDS.
>
> But when using LVTTL I always have access to the "output enable" of the
> output pin to tri-
> state the pin. But this does not work when using LVDS output.
>
> The output register is always enabled (OE set to '1') when I look at the
> design with the
> RTL viewer.
>
> This is a little bit strange because actually the Cyclone II parts do not
> have any "real"
> LVDS outputs. It is standard LVTTL and the LVDS voltage levels are
> generated by a specific
> set of resitors on the PCB.
>
>
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>
Reply by only...@online.ms●December 1, 20062006-12-01
Hi Rob,
I know that I have to use the assigment editor to change the output type from LVTTL
(default) to LVDS.
But when using LVTTL I always have access to the "output enable" of the output pin to tri-
state the pin. But this does not work when using LVDS output.
The output register is always enabled (OE set to '1') when I look at the design with the
RTL viewer.
This is a little bit strange because actually the Cyclone II parts do not have any "real"
LVDS outputs. It is standard LVTTL and the LVDS voltage levels are generated by a specific
set of resitors on the PCB.
--
--------------------------------- --- -- -
Posted with NewsLeecher v3.7 Final
Web @ http://www.newsleecher.com/?usenet
------------------- ----- ---- -- -