On 12/09/2012 01:49 AM, Vesa Solonen wrote:
My email has changed and list owner address says user unknown, so here
it is directly. Feel free to forward relevant parts on list if seen
noteworthy.
-------- Alkuperäinen viesti / Orig.Msg. --------
Aihe: Re: [Open-graphics] Open Framebuffer board
Päiväys: Sat, 08 Dec 2012 23:40:37 +0200
Lähettäjä: Vesa Solonen <[email protected]>
Vastaanottaja: [email protected]
08.12.2012 23:25, "Ing. Daniel Rozsnyó" kirjoitti:
I will have FPGA modules with memory chips (possibly dual channel - 2x
12.8Gbit/s) made to let me focus on other parts of my designs. I know
there are some, but they do not meet my criteria.
Mine will be either mini-PCIe + GPIO header, or directly 2 GPIO headers
(B2B connectors). The GPIO should be capable of feeding one video head
(either with LVDS or direcly using 4 gigabit transceivers) while the
other side will be attached to the PC.
You can then design a base board with the desired IO plugs in the
bracket, as well as to have it in PCIe or PCI format. I really want to
move to PCIe segment, so I can not guarantee that there will be enough
pins for a full 32bPCI slot, however one can use a PEX8111 bridge in
reverse mode on the base board.
It seems you could use some of CERN open hardware designs [1] and
especially the FMC PCIe Carrier [2]. CERN decide to go open hardware way
as they are publicly funded.
-Vesa
[1] http://www.ohwr.org/projects
[2] http://www.ohwr.org/projects/fmc-pci-carrier/wiki
That is quite big and to solder a FMC plug you need reflow owen and
complex PCBs. And it is still a single extension. Which starts to get a
real issue when you want to do something more (like we had to combine a
HDSDI i/o + three types of LCD output on a single FMC, that is quite an
ugly way to treat modularity).
What I want is a tiny FPGA module (not larger than the fpga+2 rams
itself) on a dual-row simple B2B plug (e.g. Tyco FH08) which can be the
"brain" of the user's design. The focus is on memory bandwidth, so I
want a dual channel memory - or 4 on larger fpga. The IO is rather
focused on serial-differential signalling. It is less routing and
generally easier to use. The carrier board can be then a really cheap
one, bearing just the external interfaces. If one "brain" is not enough,
you can use multiple ones.
That in FMC world is not possible. FMC can be okay, when you need to
focus on optimalization of a new and single interface, but not for
building complete systems.
Daniel
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