The Xillybus Forum

Hi Eli,

Is it possible to use two PCIE boards, say two KC705 with xillybus?
So more input and bandwidth could be realized. Thanks!

Best,
Chongxi

Hi,

Yes, it's possible to use Xillybus with two boards, but extra bandwidth is a rather uncommon reason, since the available 3.5 GB/s is probably more than the host can do something useful with anyhow.

There are two ways to handle multiple cards.

(1) Configure different IP cores for each in the IP core factory, so that they appear with distinct device file names. The advantage is the simplicity of telling which card is which. If both cards do exactly the same thing, the downside is that different bitfiles need to be maintained just for the sake of this.

(2) Use a Xillybus driver which adds a numeric prefix to the device file names, which represents the card it belongs to (for example, xillybus_00_read_32 and xillybus_01_read_32 instead of xillybus_read_32). This driver is available for both Linux and Windows. Note that the numbers given by the driver aren't repeatable across booting the computer, so other means are required to tell which is which.

In order to avoid confusion, the driver mentioned in (2) is given upon request.

Regards,
Eli

Dear Eli,

Using my KC705, the fastest bandwidth I get is 800MB/sec. Could you please tell me how to get 3.5GB/sec with xillybus? Do I need another board?

Best,
Chongxi

Hello,

No, you need a revision B IP core. Please send a request by email to get access to these.

Regards,
Eli