Raphael Jacquot wrote:
Daniel Rozsnyó wrote:
Dieter wrote:
There are applications where you would want the card some distance
from the computer.
a) If it had a IEEE 1394 (firewire) interface, you could hook up
several cards without running out of slots.
b) Ethernet would allow much longer distances than firewire,
Is there a way to provide Ethernet without having to add a CPU,
memory, ROM, etc. ?
I would prefer USB2 (it's everywhere, and I really do not have a
IEE1394 port) or using GbE (gigabit ethernet), the 100mbit is too slow
for a good video, even non-hd, in yuv.
Connecting e.g. an RTL8169 should not be a problem - the OGP has a lot
of user IO, but I think, that the software which supports at least
IP/UDP (required for DHCP + data transfer) would cost a lot of FPGA
gates - so you rather use a separate CPU.
there are pre-existing standards for digital video, which are defined by
the SMPTE
http://www.jkor.com/peter/smpte.html
SMPTE 259M for Standard Definition video (aka pal/ntsc)
SMPTE 274M for HDTV.
These should be the prefered output formats and allow for transmitting
the signal up to 100m away (305 ft)
But this transmits the pixels, so you now need 2 cards:
1) which generates the signal and it takes space in PCI/AGP/1U in 19"
2) which translates SMPTE to LVDS and does the scaling :/
What I mean is an external graphic card/accelerator (without add-on
card, so here goes USB2 and Ethernet) and native display connection
(LVDS). The smpte will not handle X11 nor OpenGL protocol.
I solved the thing for now by using a laptop motherboard, but that
requires more power, a hard drive and maintaining an operating system.
But playing mpeg2 (role of television) or using it as another X screen
(for work) does not really need a whole PC, a simple board with
eth/USB-FPGA-LVDS will do it (of course with proper drivers)
Daniel
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