Type-C™ Alternate Mode

A central feature of USB Type-C™ Power Delivery Protocol is the ability to active the Alternate Mode.

Alternate Mode allows some of the pins on a Type-C connector to be reconfigured to support other protocols.

reconfigurable.png
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Using the Power Delivery Protocol, the DFP begins the negotiation with the UFP to enter alternate mode

  • The DFP queries the UFP for a list of supported modes
  • The UFP reponds with a report of the available modes the UFP can support
  • The DFP selects a mode, then directs the UFP to reconfigure the pins and enter the alternate mode
  • Both the UFP and DFP enter the alternate mode

Alternate Mode Example

A user designed, or industry standard protocol can be run using Alternate mode. A common use of Alternate Mode is a video monitor.

  • The UFP (Monitor) and the DFP (Portable Workstation) are connected with a Type-C cable
  • The DFP enumerates
  • Using the Power Delivery Protocol both the UFP and DFP enter Alternate Mode and set the interface to a graphics interface

Active Signals During Enumeration

Active Signals for Alternate Mode Graphics client

Active Signals for Vendor Specific Device

In Alternate Mode the USB signals are still active allowing the UFP to re-enumerate if needed.

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