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US 2016/0092393 A1 Nge Et Al US 20160092393A1 (19) United States (12) Patent Application Publication (10) Pub. No.: US 2016/0092393 A1 Nge et al. (43) Pub. Date: Mar. 31, 2016 (54) SERIAL BUSELECTRICAL TERMINATION (52) U.S. Cl. CONTROL CPC ........ G06F 13/4282 (2013.01); G06F 13/4068 (2013.01); G06F 13/382 (2013.01) (71) Applicant: Intel Corporation, Santa Clara, CA (US) (72) Inventors: Chee Lim Nge, Hillsboro, OR (US); Tod (57) ABSTRACT Schiff, Portland, OR (US); Vijayakumar Dibbad, Bangalore (IN); Alan Hallberg, Some embodiments include apparatuses and methods having North Plains, OR (US) a node to couple to a serial bus, and a controller to provide a control signal to one of a first circuit path and a second circuit (21) Appl. No.: 14/497,925 path in order to change electrical termination of a signal at the (22) Filed: Sep. 26, 2014 node between a first electrical termination through the first circuit path during a first mode of the controller and a second Publication Classification electrical termination through the second circuit path during a second mode of the controller. The controller can be (51) Int. Cl. arranged to provide the control signal to the first and second G06F 3/42 (2006.01) circuit paths during the first and second modes without pro G06F I3/38 (2006.01) viding another control signal from the controller to the first G06F 3/40 (2006.01) and second circuit paths during the first and second modes. man VUS --------------------------------- ------------ M. W}) a' S3 19 3. Of CONTROLLER . HOST-SEL TERMINATION O- 20 -- N 90 g on 5 i 3 -2 h 2&s 2.. ---l, 130-2 120-2 TERMINATION ... L. 150 40 ligo - - EECTRONIC CRC 3OAR) SYSE 70-n O2 O3 --: Patent Application Publication Mar. 31, 2016 Sheet 1 of 5 US 2016/0092393 A1 Patent Application Publication Mar. 31, 2016 Sheet 2 of 5 US 2016/0092393 A1 VDD 291 - \l Yra. 2 s - - - - - - - 250 USB | - N ViOST M-1-6 |CONTROLLER N RI, : ? HOST SEL : M. Y-240s I R | 8 : SWITCH R3< ala---------------------------Y- -- 290- y 2 f Vy 2 - Patent Application Publication Mar. 31, 2016 Sheet 3 of 5 US 2016/0092393 A1 4. - - - - - - - 230 "if v 3 2. 226' R1 l, f - - D1Y : M- A-240 USB i 2 CONTROLLER X R32 i - 290-W v I 290- W V Y 425 Patent Application Publication Mar. 31, 2016 Sheet 4 of 5 US 2016/0092393 A1 OONNO S s's SO|Hayaº|¡¿OWEWXHONGA| |||??? 30/30|No.nosiMook'amounool| i--~~~~~~;~~~~.~~~~); ~~~~!!!0!!?!!}}{}}}}} ||HOSS3008d||| /\,89?|------------------?·J- 4…|…>kº s _rz_099. Patent Application Publication Mar. 31, 2016 Sheet 5 of 5 US 2016/0092393 A1 Erišii A. Sixñ. A. A - A RS SY NOSE REC is CRC. A R\{ Å i{ } { i SS NRER iii. E SONA. i - x ANE SY \{ R is: 8 RC A RNS ANER is S3 CONRE US 2016/0092393 A1 Mar. 31, 2016 SERAL BUSELECTRICAL TERMINATION (e.g., exchange electrical signals) with another electronic CONTROL device or system in accordance with USB specification. For example, USB connector 102 can be coupled to a USB con TECHNICAL FIELD nector 103 of electronic system 104 through a USB connec 0001 Embodiments described herein pertain to electronic tion (e.g., USB cable) 105. Electronic system 104 can include data communication. Some embodiments relate to Universal a USB unit 106 (e.g., a USB host, USB device, or USB dual-role host and device) that can operate in accordance with Serial Bus (USB) communication. USB specification. Although not shown in FIG. 1, USB unit BACKGROUND 106 may include a USB controller and termination circuits that are similar to, or identical to, USB controller 101 and 0002. A serial bus connection (e.g., USB cable) is one of termination circuits 110-1 and 110-2 of apparatus 100. different types of connections that allow communication 0012. Each of USB connectors 102 and 103 can include a between electrical systems or devices. Some systems (e.g., USB Type-C connector, a USB Type-C adapter, or another personal computers) may include a serial bus controller that type of connector or adapter compatible with a USB Type-C can be configured to operate in different roles at different COnnectOr. times. For example, some USB controllers may be configured 0013 USB connection 105 can include a combination of to operate as a dual-role USB controller, such as a USB host USB Type-C connectors (not shown for simplicity) and wires role and a USB device role. In according with USB specifi (e.g., copper wires) to allow it to couple to (e.g., mate with) cation, a signal at a certain pin of a USB connector is required USB connectors 102 and 103. For simplicity, only two wires to have a specific electrical termination, depending on which 107 and 108 of USB connection 105 are shown in FIG. 1. role the USB controller coupled to the USB connector oper USB connection 105 includes other wires (not shown) for ates. If the electrical termination required by USB specifica conducting signals (e.g., D+, D-, ground, etc.) in accordance tion is poorly implemented in a device or system, control with USB specification. In the example of FIG. 1, wire 107 logic for the USB controller of the device or system, circuit can be used to carry power (e.g., Voltage Vs) between USB board layout, or both may be complicated. connectors 102 and 103. Wire 108 can be used to carry Con figuration Channel (CC) information (e.g., CC signal) in BRIEF DESCRIPTION OF THE DRAWINGS accordance with USB Type-C Cable and Connector Specifi 0003 FIG. 1 shows an apparatus including a USB control cation. ler and termination circuits, according to some embodiments 0014. As shown in FIG. 1, USB connector 102 can include described herein. pins 120-1, 120-2, and 131. USB connector 102 also includes 0004 FIG. 2 shows a schematic diagram of a termination other pins (not shown) for conducting signals (e.g., D+, D-. circuit to provide electrical termination to a signal at a node, ground, etc.) in accordance with USB specification. In FIG. 1, according to some embodiments described herein. pin 131 can correspond to Vs pin of a USB Type-C con 0005 FIG. 3 shows a schematic diagram of a termination nector and can be coupled to wire 107 of USB connection 105 circuit that can be a variation of the termination circuit of FIG. to provide power to or receive power from USB unit 106. Pins 2, according to Some embodiments described herein. 120-1 and 120-2 can correspond to CC1 and CC2 pins, 0006 FIG. 4 shows a schematic diagram of a termination respectively, of a USB Type-C connector (e.g., USB Type-C circuit including details of a Switch, according to some receptacle). Each of pins 120-1 and 120-2 can be referred to embodiments described herein. as a Configuration Channel pin (CC pin). 0007 FIG. 5 shows an apparatus in the form of a system, 0015 Connector 102 can be arranged such that either pin according to some embodiments described herein. 120-1 or pin 120-2, but not both, can be coupled to the 0008 FIG. 6 is flowchart showing a method of operating a Configuration Channel (e.g., wire 108) of a USB connection USB device or system, according to some embodiments (e.g., USB connection 105) as specified by USB Type-C described herein. Cable and Connector Specification. FIG. 1 shows an example where pin 120-1 is coupled to the Configuration Channel DETAILED DESCRIPTION (e.g., wire 108) of USB connection 105 and pin 120-2 is not 0009 FIG. 1 shows an apparatus 100 including a USB coupled to the Configuration Channel of USB connection controller 101 and termination circuits 110-1 and 110-2, 105. However, in another example, pin 120-2 can be coupled according to some embodiments described herein. Apparatus to the Configuration Channel of USB connection 105 and pin 100 can include or be included in an electronic communica 120-1 is not coupled to the Configuration Channel of USB tion device or system, such as a computer (e.g., notebook, connection 105. laptop, or table), a cellular phone, or other electronic com (0016 Apparatus 100 can include nodes 130-1 and 130-2 munication devices or systems. USB controller 102 and ter coupled to pins 120-1 and 120-2, respectively, of USB con mination circuits 110-1 and 110-2 can be arranged (e.g., nector 102. The signals at nodes 130-1 and 130-2 are the same configured) to operate in accordance with USB specification. as the signals at pins 120-1 and 120-2, respectively. Depend 0010 USB specification described herein refers to all ing on which mode (e.g., USB host mode or USB device USB specifications published by USB Implementers Forum mode) that USB controller101 operates (as described in more Inc. in San Francisco, Calif., including USB 3.1 Specification detail below), the signals at nodes 130-1 and 130-2 can be Revision 1.0, published on Jul. 16, 2013; USB Power Deliv terminated to a Supply node 191 (e.g., terminate to Voltage ery Specification Revision 2.0, published on Aug. 11, 2014: VDD in USB host mode) or to a supply node 190 (e.g., and USB Type-C Cable and Connector Specification Revi terminate to ground in USB device mode). sion 1.0, published on Aug. 11, 2014. 0017 Termination circuit 110-1 can be arranged to pro 0011. As shown in FIG.
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