Introduction to CC cable of USB type-C

USB Type-C And CC Line introduction
One 、CC Line (Configuration Channel) Definition
CC Line transmission signal adopts BMC（Biphase Mark Coding） code
1、 Phase change once indicates 0, Two phase changes indicate 1
2、 use 4b/5b code , Transmission rate 300Kbps, Half duplex mode
3、DC coupling , rated 0-1.125V

Two 、CC Line (Configuration Channel) function
1、 Monitor whether there is USB Device insertion
2、 Determine the power role ：Source perhaps Sink
3、 Identify data roles ：DFP perhaps UFP
4、 Discover and configure Vbus/Vconn
5、 Configure optional Alternate Pattern

3、 ... and 、CC Line function Alternate Modes
Use USB 3.1 As other data transmission purposes , For example, video 、 Audio transmission
adopt CC Linear Vendor-defined messages(VDM, Custom information ) To configure
for example ：HDMI Alt Mode for USB Type-C Connector

Four 、CC Online pull-down resistance and power role monitoring