Xillybus driver download

It's recommended to set up the IP core according to the FPGA project's natural requirements, possibly including extra utility streams for various less important purposes. These extra streams typically have a low impact on the licensing fee, if at all, but may add a significant value to the IP core. The Xillybus Windows driver is given in binary format. Any use and distribution of this software is allowed. You are free to copy and use these drivers.

Please refer to the license text for details. Skip to main content. There is something more subtle to consider. When the kernel is loaded into memory it has a base address. That space is just below the load address of the base of the kernel the kernel might load somewhere like 0x as an example.

The entire space of initial ramdisk and kernel modules, just below the base load address, must be accessible by a direct branch instruction. It's therefore recommended to build your own custom IP core after finishing the flow with the demo bundle. You need to download two items, one from each of the two bundle groups below or the FPGA bundle only, if certain Linux distributions are chosen. Please refer to the "getting started" guides in the documentation page afterwards.

For information about the bandwidth limits, please refer to this page. If the device file is bidirectional, and already opened only in one direction, the opposite direction may be opened once. But since the PCIe card is based upon reprogrammable logic, a sudden disappearance from the bus is quite likely as a result of an accidental reprogramming of the FPGA while the host is up.

In practice, nothing happens immediately in such a situation. But if the host attempts to read from an address that is mapped to the PCI Express device, that leads to an immediate freeze of the system on some motherboards, even though the PCIe standard requires a graceful recovery. Rather, the FPGA prepares a small buffer which contains short messages, which inform the host what the interrupt was about.

Each of the possibly bidirectional pipes presented to the user is allocated a data channel between the FPGA and the host. The distinction between channels and pipes is necessary only because of channel 0, which is used for interrupt- related messages from the FPGA, and has no pipe attached to it. Even though a non-segmented data stream is presented to the user at both sides, the implementation relies on a set of DMA buffers which is allocated for each channel.

The host responds by making the data available for reading through the character device. Flow control mechanisms exist on both sides to prevent underflows and overflows.

But the FPGA will submit a partially filled buffer only if directed to do so by the host. This timeout mechanism balances between bus bandwidth efficiency preventing a lot of partially filled buffers being sent and a latency held fairly low for tails of data.

A similar setting is used in the host to FPGA direction. The handling of partial DMA buffers is somewhat different, though. The user can tell the driver to submit all data it has in the buffers to the FPGA, by issuing a write with the byte count set to zero.

This allows the user to be oblivious about the underlying buffering mechanism and yet enjoy a stream-like interface. Whenever possible, the driver attempts to hide this when the pipe is accessed differently from its natural alignment. For example, reading single bytes from a pipe with 32 bit granularity works with no issues. To prevent loss of data, these leftover bytes need to be moved to the next buffer.

As mentioned earlier, the number of pipes that are created when the driver loads and their attributes depend on the Xillybus IP core in the FPGA.