Hello,
at present I am working on an Infiniband implementation on a Virtex-II
Pro. As far as I know the build-in RocketIOs are fully compliant to
the Infiniband standard (beacon and variant CRC excluded). There are
two types of CRC, the invariant and the variant type. Although the
RocketIOs are able to calculate at least one type, i.e. the invariant
CRC, you cannot make use of it in this particular case. The reason for
this is that the invariant CRC is needed for the variant CRC type
which you have to handle yourself, anyway. Has anyone ever tried or
finished an Infiniband implementation inside the V2P/RocketIOs and
could share his experience with me? Or is there any example
implementation for the whole CRC calculation inside the FPGA fabric
available? I wonder how one could ever reach the typical 2.5 Gbit/s
Infiniband transmission rate when almost all functions must be handled
inside the FPGA fabric? Still some other questions: Could someone
please help me on the question how often the beacon signal should be
repeated before synchronisation is sufficiently established? And what
about the packet generation? There are several IBA packet structures.
If I assume a plain point-to-point connection it surely would not be
necessary to include all that global routing stuff inside the header.
So what would be the adequate format to use? The "local packet"
structure or maybe just "raw packets"? If someone got the slightest
clue, please post a write an email! Any answer is appreciated. Best
regards, Bruce

Keywords: FPGA, Xilinx, Virtex 2, Virtex2, Virtex-2, Virtex II,
VirtexII, Virtex-II, RocketIO, RocketI/O, RocketIOs, RocketI/Os,
Rocket IO, Rocket I/O, Rocket IOs, Rocket I/Os, Virtex2Pro,
VirtexIIPro, MGT, SerDes, Gigabit Transmission, Infiniband, Beacon
Signal, Synchronisation, Gbit, Gb, Gbit/s, Gbits, Gb/s, Gbs, P2P, IBA

Why :
 - Do you post the same post at 40 minutes interval
 - Do you post the same post in at least 3 differents groups I'm subscibed to

The only effect is that it's make people angry and lessen their motivation to answer you.
So don't do it. If you feel your post could belong to several newsgroup, choose the ones
that
is more likely to have people you look for.

Given the post, I'd say it's here in FPGA. design is too generic, and vhdl is more about
the language itself than what you do with it.


Sylvain



Bruce wrote:
> Hello,
> at present I am working on an Infiniband implementation on a Virtex-II
> Pro. As far as I know the build-in RocketIOs are fully compliant to
> the Infiniband standard (beacon and variant CRC excluded). There are
> two types of CRC, the invariant and the variant type. Although the
> RocketIOs are able to calculate at least one type, i.e. the invariant
> CRC, you cannot make use of it in this particular case. The reason for
> this is that the invariant CRC is needed for the variant CRC type
> which you have to handle yourself, anyway. Has anyone ever tried or
> finished an Infiniband implementation inside the V2P/RocketIOs and
> could share his experience with me? Or is there any example
> implementation for the whole CRC calculation inside the FPGA fabric
> available? I wonder how one could ever reach the typical 2.5 Gbit/s
> Infiniband transmission rate when almost all functions must be handled
> inside the FPGA fabric? Still some other questions: Could someone
> please help me on the question how often the beacon signal should be
> repeated before synchronisation is sufficiently established? And what
> about the packet generation? There are several IBA packet structures.
> If I assume a plain point-to-point connection it surely would not be
> necessary to include all that global routing stuff inside the header.
> So what would be the adequate format to use? The "local packet"
> structure or maybe just "raw packets"? If someone got the slightest
> clue, please post a write an email! Any answer is appreciated. Best
> regards, Bruce
> 
> Keywords: FPGA, Xilinx, Virtex 2, Virtex2, Virtex-2, Virtex II,
> VirtexII, Virtex-II, RocketIO, RocketI/O, RocketIOs, RocketI/Os,
> Rocket IO, Rocket I/O, Rocket IOs, Rocket I/Os, Virtex2Pro,
> VirtexIIPro, MGT, SerDes, Gigabit Transmission, Infiniband, Beacon
> Signal, Synchronisation, Gbit, Gb, Gbit/s, Gbits, Gb/s, Gbs, P2P, IBA