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Homework5Solutions - ECE 485/585 Winter 2008 Homework 5...

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ECE 485/585 Winter 2008 Homework 5 Solutions 1. [10] Assume an isochronous transfer can send one maximum sized data packet per frame. (a) [5] Ignoring protocol overhead, how much theoretical bandwidth is used for a single isochronous transfer in full speed mode? (b) [5] What can you conclude about the maximum number of concurrent isochronous transfers in full speed mode? In full speed mode, a frame is 1ms and there are 12,000 bits/ms or 1.5KB/ms. The largest packet size is 1023 bytes. 1023/1500 = 68.2%. So at most one isochronous transfer can be accommodated at full speed. 2. [5] Assuming an isochronous transfer can send one maximum sized data packet per microframe, how much theoretical bandwidth is used for a single isochronous transfer in high speed mode? Ignore protocol overhead. In high speed mode, a micro frame is 125 µ s and there are 60,000 bits/ s or 7.5KB/ s. The largest packet size is 1024 bytes. 1024/7500 = 13.6%.
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3. [25] Draw a diagram similar to that shown in class that illustrates USB error recovery using data toggle for an OUT transaction in which the data is received uncorrupted by the target but the host fails to receive a correct ACK from the target.
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This note was uploaded on 02/01/2010 for the course ECE 585 taught by Professor Faust during the Fall '08 term at Portland State.

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Homework5Solutions - ECE 485/585 Winter 2008 Homework 5...

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