Abstract
The USB device designer must be aware of the worst case total delay between the host and a peripheral, because this value is necessary for setting the transaction timeout (allowable response packet delay).
In the paper the problem of USB bus timeout is covered for different USB buses: Low/FullSpeed USB 1.x, HighSpeed USB 2.0 and SuperSpeed USB 3.1 Gen 1. The USB 3.1 bus time delay measurement results are presented and supremum of response time is estimated. Additionaly, time delay of isochronous timestamps broadcasting is considered. At last, the demand for adaptive setting of the USB 3.1 bus timeout is expressed.
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Notes
- 1.
This 7.5 bit times delay is defined as the time from the EOP (End of Packet) to idle transition observed on the upstream end of the function cable until the SOP (Start of Packet) transition from the device is returned to upstream end of the target cable [1].
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© 2016 Springer International Publishing Switzerland
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Mielczarek, W., Sawicki, M. (2016). USB 3.1 Gen 1 Hub Time Delay Influence on System Timeout and Bus Clock Synchronization. In: Gaj, P., Kwiecień, A., Stera, P. (eds) Computer Networks. CN 2016. Communications in Computer and Information Science, vol 608. Springer, Cham. https://doi.org/10.1007/978-3-319-39207-3_20
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DOI: https://doi.org/10.1007/978-3-319-39207-3_20
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