So, my boss asks me today, "why can't we send a usb message out every single millisecond?" in response to my statement that there is an approximately 4 millisecond delay between a message being sent and getting a reply from the device. The current driver we're using utilizes the newest version of urb chaining in isochronous mode. If I were to go about trying to explain to him why this delay is present in the system, what would I say? I assume that it takes 2 ms to load and send to the device and another 2 ms for the device to load and send data back to me. Am I correct? Why is there a 2 ms delay? Is the 1st millisecond a "preparation" phase?
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