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May 05, 2022
USB Cheat Sheet
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I spend time investigating a non-existing bug today because I
misunderstood a USB term. So I made myself a cheat sheet. Maybe it
will save time to someone.

   Standard     Also Known As  Nominal   MiB/s Wires Cable
USB 1.1         Full Speed    12 Mbps    1.5   4     4m
USB 2.0         Hi-Speed      480 Mbps   60    4     4m
USB 3.2 Gen 1   USB 3.0       5000 Mbps  625   8     3m
                USB 3.1 Gen 1
USB 3.2 Gen 2   USB 3.1       10000 Mbps 1250  8     2m
                USB 3.1 Gen 2
USB 3.2 Gen 2x2 USB 3.2       20000 Mbps 2500  12    1m
USB 4           USB4 Gen 2x2  20000 Mbps 2500  12    0.8m
USB 4 (Opt)     USB4 Gen 3x2  40000 Mbps 5000  12    0.8m

Gen naming Convention and lanes
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USB Gen A x B
A = Generation
B = Num lanes used

   Gen Name     Gbps Lanes Total Gbps    Marketing Name
USB 3.2 Gen 1x1 5    1     5          SuperSpeed USB 5Gbps
USB 3.2 Gen 2x1 10   1     10         SuperSpeed USB 10Gbps
USB 3.2 Gen 1x2 5    2     10
USB 3.2 Gen 2x2 10   2     20         SuperSpeed USB 20Gbp
USB 4 Gen 2x2   10   2     20         USB4 20Gbps
USB 4 Gen 3x2   20   2     40         USB4 40Gbps

Cables
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 4 wires: PWR, GRD, D+, D-.
 8 wires: PWR, GRD, D+, D-. RX+ , RX- , TX- , TX+.
16 wires: PWR, GRD, D+, D-, RX1+, RX1-, RX2-, RX2+, TX1+, TX1-, TX2-,
TX2+ (USB-C only).

Note: 1 USB lane = 1 twisted wire pair +/-.
Note: 4 wires = 1 half-duplex lane, 8 wires = 1 lane, and 12 wires =
2 lanes,

Specifications
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USB 2.0^[1] Apr, 2000
USB 3.0^[2] Nov, 2008
USB 3.1^[3] Jul, 2013
USB 3.2^[4] Sep, 2017
USB 4.0^[5] Aug, 2019

References
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^ [1] USB 2.0 Specification
^ [2] USB 3.0 Specification
^ [3] USB 3.1 Specification
^ [4] USB 3.2 Specification
^ [5] USB 4.0 Specification

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