I did a little bit of research on the Razer Core Chroma usb card.
This card uses 3 ASM1142 pcie to usb bridges (let's call them IC_0,
IC_1, IC_2) and the PCIe 4x connector is wired in a non-standard way.
IC_0 is wired up to the PCIe in a normal fashion using only the pcie
lane 0 (TX and RX) and the "usual" clock lane.
IC_1 data lanes are wired to pci lane 1 (TX and RX) but the clock lane
has been wired to lane 3 RX.
IC_2 data lanes are wired to pci lane 2 (TX and RX) but the clock lane
has been wired to lane 3 TX.
Furthermore IC_2 has one of it's two USB interfaces wired to an USB to
Ethernet bridge (ASIX AX88179), while the other one is connected to
another micro-controller on the Chroma's main board that I presume
controls the LED colours, in windows this IC is detected as some sort of
mouse so I would say that Razer have recycled some code to implement
this...
All clock lanes merge together in another IC (IC_4) that is on the
Chroma's main board.
I would say that they are doing some sort of Time-division to share the
same PCIe port for three different devices and this is provoking all the
mess. I have read people having trouble in every single OS (MacOS,
Windows and Linux) with this device. I would expeted such junkie desing
on low budged development, but never in a company as Razer. And
their response to they issue is been horrendous... something to bare in
mind in future acquisitions
Anyway it would be interesting to know if other people having trouble
has more of one ASM1142 or not
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https://bugs.launchpad.net/bugs/1749961
Title:
xhci_hcd: TRB DMA errors reported with ASMedia ASM1142 USB 3.1
Controller
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