SLVUCR8A September   2023  – March 2024 TPS25751

 

  1.   1
  2.   Read This First
    1.     Notational Conventions
    2.     Glossary
    3.     Related Documents
    4.     Support Resources
    5.     Trademarks
  3. 1Introduction
    1. 1.1 Introduction
      1. 1.1.1 Purpose and Scope
    2. 1.2 PD Controller Host Interface Description
      1. 1.2.1 Overview
      2. 1.2.2 Register and Field Notation
    3. 1.3 Unique Address Interface
      1. 1.3.1 Unique Address Interface Protocol
  4. 2PD Controller Policy Modes
    1. 2.1 Overview
    2. 2.2 Source Policy Mode
    3. 2.3 Sink Policy Mode
  5. 3TPS25751 Registers
  6. 44CC Task Detailed Descriptions
    1. 4.1 CPU Control Tasks
      1. 4.1.1 'Gaid' - Return to Normal Operation
      2. 4.1.2 'GAID' - Cold Reset Request
    2. 4.2 PD Message Tasks
      1. 4.2.1 'SWSk' - PD PR_Swap to Sink
      2. 4.2.2 'SWSr' - PD PR_Swap to Source
      3. 4.2.3 'SWDF' - PD DR_Swap to DFP
      4. 4.2.4 'SWUF' - PD DR_Swap to UFP
      5. 4.2.5 'GSkC' - PD Get Sink Capabilities
      6. 4.2.6 'GSrC' - PD Get Source Capabilities
      7. 4.2.7 'GPPI' - PD Get Port Partner Information
      8. 4.2.8 'SSrC' - PD Send Source Capabilities
      9. 4.2.9 'MBRd' - Message Buffer Read
    3. 4.3 Patch Bundle Update Tasks
      1. 4.3.1 'PBMs' - Start Patch Burst Mode Download Sequence
      2. 4.3.2 'PBMc' - Patch Burst Mode Download Complete
      3. 4.3.3 'PBMe' - End Patch Burst Mode Download Sequence
      4. 4.3.4 'GO2P' - Go to Patch Mode
    4. 4.4 System Tasks
      1. 4.4.1 'DBfg' - Clear Dead Battery Flag
      2. 4.4.2 'I2Cr' - I2C Read Transaction
      3. 4.4.3 'I2Cw' - I2C Write Transaction
  7. 5User Reference
    1. 5.1 PD Controller Application Customization
    2. 5.2 Loading a Patch Bundle
    3. 5.3 GPIO Events
    4. 5.4 AUTO_NEGOTIATE_SINK Register
      1. 5.4.1 AUTO_NEGOTIATE_SINK Usage Example 1
      2. 5.4.2 AUTO_NEGOTIATE_SINK Usage Example 2
      3. 5.4.3 AUTO_NEGOTIATE_SINK Usage Example 3
      4. 5.4.4 AUTO_NEGOTIATE_SINK Usage Example 4
  8. 6Revision History

4.2.9 'MBRd' - Message Buffer Read

Table 4-11 'MBRd' - Read from PD message buffer.
DescriptionThe MBRd Task instructs the PD Controller to read data from the extended message buffer previously received from the Port Partner.
INPUT DATAXBitNameDescription
23ReservedReserved (Write as 0).
22UnlockRxBufferThis input controls whether or not the PD controller unlocks its internal buffer after this Task is completed. It is recommended to unlock the internal buffer as soon as possible to make room for other incoming messages. It is important that the host only set this bit to 1 after it has received an alert that the Rx Buffer is locked (that is INT_EVENTx.MBRdBufferReady asserted).
0bDo not clear the internal buffer, another 'MBRd' Task can be used later.
1bClear the internal buffer after this Task completes and the requested data is in the DATAx register.
21:16DataSizeNumber of data bytes to be read in from the message buffer. Up to 62 bytes can be read at after.
15:0BuffOffsetBuffer Offset. Values 0 to 259 are possible.
OUTPUT DATAXBitNameDescription
511:16DataByte1First Byte of data read at BuffOffset.
15:0MessageSizeSize of message in bytes.
Task CompletionThe MBRd Task completes after buffer data of DataSize at BuffOffset has been read from the message buffer.
Side EffectsNone
Additional InformationThis Task is required for the host to obtain the information from the response due to the usage of the 'GPPI' Task . The PD controller has a single buffer per port that is shared for these messages.