Michael S (already5chosen.delete@this.yahoo.com) on June 3, 2022 6:32 am wrote:
> Adrian (a.delete@this.acm.org) on June 3, 2022 5:26 am wrote:
> >
> > I believe that you should have better luck searching for a board containing a PCIe to PCI-X bridge chip,
> > like those made by Broadcom or Diode Incorporated,instead of searching for a SBC with 64-bit PCI.
> >
> > Such a bridge board could be used with any modern SBC with PCIe.
> >
>
> I don't understand how it looks mechanically.
> Compact PCI board with full backside bus that serves as COM Express carrier?
> Do OTS products like that exist?


Mechanically, there are at least 3 variants. One is, as you have said, with the PCIe SBC as a mezzanine card on a CompactPCI carrier.

The second uses a PCIe x4 external cable (and an adapter from external cable to standard PCIe slot), to connect to a PCIe SBC mounted elsewhere, outside the CompactPCI rack.

The third needs a rack that is mixed CompactPCI / CompactPCI Express. The SBC would be a CompactPCI Express card and the bridge card has to be inserted into a hybrid slot, making the link between CompactPCI and CompactPCI Express.


However, all the OTS products that I have seen were for 32-bit 66-MHz PCI, not for 64-bit PCI. For 64-bit PCI, I have seen only the corresponding bridge ICs, which should enable similar products, but I do not know if they are easy to find.