USB superspeed peripherals Forum Discussions

 Hi all,

Is there any solution to send data from device to host continuosly?

I want to send ITP data back to host, and i need every ITP will be read at host side. 

Best regards

Chong Han

 Hi

reading datasheets sometomes i find the word burst but i cannot figure out the difference between burst and packet. I've found a definition for burst reading the API guide:

The burst size is the minimum

number of words of data that will be sourced/sinked across the GPIF interface without further

updates of the GPIF DMA flags. The device connected to FX3 is expected to complete a burst

that it has started regardless of any flag changes in between. Please note that this has to be

set to a non-zero value (burst size is greater than one), when the GPIF is being configured

with a 32-bit data bus and functioning at 100 MHz.

but what about a packet ?

Can anyboby help me ?

Regards

Pit

 Hi, 

what is the best packet size per transfer for USB 2.0 and USB 3.0?

Hi,

I need FX3 SDK version 1.2.3 to check my device , Where to download FX3 SDK version 1.2.3?

Thanks,

I am trying to use the CyU3PDmaChannelGetBuffer and CyU3PDmaChannelCommitBuffer API to sent the data from CPU to GPIF bus manually and found it is not fast enough.

I have also used a scope to trace  the output data.  I found that it takes 70-80 μs to complete.

Is there a way to further reduce the running time to less than 30μs of this application like using low level DMA API?

Thanks

status=CyU3PDmaChannelGetBuffer(&AppDmaFpgaRegAccessManualOutHandle,&FpgaHostManualOutBuf_p, CYU3P_NO_WAIT);

if (status != CY_U3P_SUCCESS)

{

return status;

}

//popular the Buffer of Register Read Address

FpgaHostManualOutBuf_p.buffer[0]=(FpgaHostRegAddress&0x000000FF)>>0; /*Reg Read Address*/

FpgaHostManualOutBuf_p.buffer[1]=(FpgaHostRegAddress&0x0000FF00)>>8; /*Reg Read Address*/

FpgaHostManualOutBuf_p.buffer[2]=(FpgaHostRegAddress&0x00FF0000)>>16; /*Reg Read Address*/

FpgaHostManualOutBuf_p.buffer[3]=(FpgaHostRegAddress&0xFF000000)>>24; /*Reg Read Address*/

FpgaHostManualOutBuf_p.count=4;             /**< Byte count of valid data in buffer. */

FpgaHostManualOutBuf_p.size=32;             /**< Actual size of the buffer in bytes. Should be a multiple of 16. */

FpgaHostManualOutBuf_p.status=0;           

status = CyU3PDmaChannelCommitBuffer (&AppDmaFpgaRegAccessManualOutHandle,FpgaHostManualOutBuf_p.count,0);

if (status != CY_U3P_SUCCESS)

{

return status;

}

//get fpga register value;

status = CyU3PGpifReadDataWords (1, CyFalse, 1, RegRrData_p, 0xF0000000);

if (status != CY_U3P_SUCCESS)

{

return status;

}

I'm working with AN75779.  I'd like to see the output from the various CyU3PDebugPrint() calls.  I'm not seeing much at the uart pins.  Is there some initialization I need to do?  What baud, parity, databits, stopbits, etc... am I looking for?

--Adam

I've installed cyusb3.sys onto Win 8.1 system.

Driver version is 1.2.3.3.

When I plug in the FX3 device, I get this message:

"The software for this device has been blocked from starting because it is known to have problems with Windows.
Contact the hardware vendor for a nex driver. (Code 48)"

So, what's the next step?

Screen captures are attached.

Hi,

I am considering FX3 for my new design. It is a nice piece of hardware. I like to ask:

- I will implement a custom USB driver that takes data from my FPGA and sends to PC. The data needs to be send with high bandwidth and low latency. I would use DMA for this operation. However the datasheet says something very peciluar. 

"■ As a USB peripheral, FX3 supports UAS, USB Video Class (UVC), Mass Storage Class (MSC), and Media Transfer Protocol (MTP) USB peripheral classes. As a USB peripheral,all other device classes are supported only in pass-through mode when handled entirely by a host processor external tothe device."

It appears, I have to have a second processor to handle my custom USB driver. This doesn't make sense at all. 

- What type of throughput I could achieve using this IC assuming I use DMAs efficiently.