See in below figure a USB 3.0 cable cross-section. There are three groups of wires:
TP 1) UTP pair,
2) Shielded Differential Pair(SDP, twisted or twinax signal pairs),
3) Power and ground wires.
The UTP is intended to transmit the USB 2.0 signaling while the SDPs are for SuperSpeed, the shield is needed for the SuperSpeed differential pairs for signal integrity and EMI performance.Each SDP is attached with a drain wire, which is eventually connected to the system ground through the GND_DRAIN pin(s) in the connector.
A metal braid is required to enclose all the wires in the USB 3.0 cable. The braid is to be terminated to the plug metal shells, close to 360° as possible, to contain EMI.
Cable Wire Assignments :
| Wire Number | Signal Name | Description | Color |
| 1 | PWR | Power | Red |
| 2 | UTP_D- | Unshielded twist pair,negative | White |
| 3 | UTP_D+ | Unshielded twist pair,positive | Green |
| 4 | GND_PWRrt | Ground for power return | Black |
| 5 | SDP1- | Shielded differential pair 1, negative | Blue |
| 6 | SDP1+ | Shielded differential pair 1, positive | Yellow |
| 7 | SDP1_Drain | Drain wire for SDP1 | ----------- |
| 8 | SDP2- | Shielded differential pair 2, negative | Purple |
| 9 | SDP2+ | Shielded differential pair 2, positive | Orange |
| 10 | SDP_Drain | Drain wire for SDP2 | ----------- |
| Braid | Shield | Cable external braid to be 360° Terminated on to plug metal shell | ----------- |
Thanx You. Nice Job.
ReplyDeleteplease tell me about USB3.0 Bus Architecture.
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