A passive cable designed for Gen2 (10Gbit/s) is limited to approximately 1m in length and can support the new 20Gbit/s connection speed. The USB Implementers’ Forum (USB-IF) is emphasizing the transition to Type-C by moving the USB cable and connector chapter to a separate document and renaming the standard-A, standard-B, and mini/micro connectors as legacy USB connectors.Īll passive USB Type-C cables can be used for USB 3.2 GenXx2 connections since four SuperSpeed/SuperSpeedPlus differential pairs are mandatory per the USB Type-C specification. USB Type-C is becoming the new standard USB connector for most consumer products. Type-C connectors can be plugged in either way up. USB Type-C is a small, robust connector suitable for PCs, laptops, tablets, phones etc. USB 3.2 and USB Type-C cables and connectors Also, device class drivers and/or device functions such as mass storage, networking, and video may need to be optimized to take advantage of the new 20Gbit/s connection speed. However, 20Gbit/s throughput can reveal operating system and/or CPU and memory bottlenecks that were absent at 5Gbit/s or 10Gbit/s. Similarly, Synopsys’ USB device controller uses the same device software stack for USB 3.0, USB 3.1, and USB 3.2. USB 3.0, USB 3.1, and USB 3.2 xHCI compliant host controllers all use the same xHCI host software stack. Just as the USB 3.1 programming model did not change from USB 3.0, the programming model for USB 3.2 host and device controllers does not change to support x2 connections. In Synopsys USB/DisplayPort PHYs, switching is handled by the Type-C Assist (TCA) function (Figure 2). The required switching between USB TX or USB RX, DP TX, and Not Used pins (Figure 3) for each lane and each use case is best handled by a digital switch that is integrated in the PHY to preserve signal integrity. USB 3.2 takes advantage of the four differential SuperSpeed/SuperSpeedPlus pairs present in the USB Type-C connector, unlike USB 3.1 and USB 3.0, which used one or the other TX/RX lane pair, depending on the orientation of the Type-C connector (Figure 1).įigure 3 USB 3.2 and DisplayPort (DP) Alt Mode Lane usage on Type-C connector (Source: Synopsys) Both 10Gbit/s connection speeds are needed and support different use cases. However, due to the more efficient line encoding for Gen2, throughput for Gen2x1 is approximately 1.2 times greater than for Gen1x2.
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