• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 33 subscribers
  • Views 1179 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

About the setting of XIO3130

Yyaz
Prodigy 40 points
Other Parts Discussed in Thread: XIO3130

Hello.

Now I'm designing a board like this.

CPU(ROOT/UpStream) <-> XIO3130 <-> FPGA(EndPoint/DownStream)

(The FPGA has PCIe IP.)

I wanna implement following both direction access.

(A) CPU(Master) -> FPGA(Slave)
(B) FPGA(Master) -> CPU(Slave)

I can access (A) direction already,
But I can't access (B) direction.

When accessing via XIO3130,
Do I need set some setting to XIO3130 for (B) direction access ?
(In my board, the setting for XIO3130 is default setting.)

  • 0
    Guru 317280 points
    So your FPGA is doing DMA? How exactly do you test whether it works?
  • 0 in reply to Clemens Ladisch
    Prodigy 40 points
    Hi, Clemens Ladisch.
    Thank you for your reply.

    >So your FPGA is doing DMA?
    Yes.My FPGA is doing DMA.
    I designed DMA Controller in FPGA for it.

    Do I need set some setting when I implement DMAC in FPGA at downstream????

    >How exactly do you test whether it works?
    Just I tried accessing DMAC to PCIe IP.
    According to spec of PCIe IP, if PCIe IP's internal-bus(AHB-Lite Bus) port receives access from internal module(like a DMAC)
    PCIe IP starts PCIe access to Root.

    I could accessed to the PCIe IP correctly through internal bus.
    But when DMAC start to access to PCIe IP through internal-bus,
    PCIe IP's internal-bus port indicates "Wait" state to DMAC
    I can't cancel this state to continue accessing to PCIe IP.
    I thought the reason of this problem is that some problem is occuring on PCIe route.
    So first, I wanna confirm that do I need some setting for using DMAC , or not.
  • 0 in reply to Yyaz
    Guru 317280 points
    The XIO3130 itself does not need any special configuration; the default configuration made by the OS already allows DMA.

    Of course, this assumes that the driver on the host has correctly configured the system for DMA.
  • 0 in reply to Clemens Ladisch
    Prodigy 40 points

    Hi,Clemens Ladisch

    >XIO3130 itself does not need any special configuration; the default configuration made by the OS already allows DMA.

    >Of course, this assumes that the driver on the host has correctly configured the system for DMA.

    I got it. 

    I  review about this problem from another point of view.

    Thank you for your reply !!

  • 0 in reply to Yyaz
    TI__Guru* 76130 points
    As always, thanks for your support Clemens.