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USB Superspeed Peripherals

Anonymous
Not applicable

 Hi

   

 

   

when transferring data from FPGA to PC using Cypress Streamer and changing those 2 parameters i see different speeds. It happens that keeping Packets per Xfer at a fixed value and changing Xfers to queue from 64 to 32 i see a grater speed i would expect that queueing more packets reduces CPU overhead and this results in a greater speed...Why this is not happening ?

   

 

   

can anybody give me an explanation ?

   

 

   

regards

   

 

   

Pietro

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1 Reply
Anonymous
Not applicable

 Hi,

   

 

   

When changing the xfers in queue from 64 to 32 the speed should decrease.Please let me know when the data rate is decreasing or not.

   

 

   

In your response "changing Xfers to queue from 64 to 32 i see a grater speed" it seems  that it is happening in the other way.i.e speed is increasing when xfers per queue is reduced.

   

 

   

Regards,

   

Vikas.

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