Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Offset Field Name Definition
Byte 5 Serial Bus Type Serial Bus Type
Indicates which type of serial bus connection this
descriptor describes. Defined values are:
0
1
Reserved
I2C
2 SPI
3 UART
4-191 Reserved
192-255 Hardware Vendor Defined
Byte 6 General Flags [7:0] Flags that are common to all serial bus connection types.
Bits [7:2]
Reserved. Must be 0.
Bit [1]
Consumer/Producer:
0x1: This device consumes this resource
0x0: This device produces and consumes this
resource
Bit [0]
Slave Mode.
0x0: The communication over this connection is
initiated by the controller.
0x1: The communication over this connection is
initiated by the device.
Byte 7 Type Specific Flags, bits[7:0] Flags specific to the indicated Serial Bus Type (see
above).
Byte 8
Type Specific Flags,
bits[15:8]
Flags specific to the indicated Serial Bus Type (see
above).
Byte 9 Type Specific Revision ID Revision ID for the data describing the serial bus
connection specified by Serial Bus Type (see above).
Byte 10 Type Data Length, bits[7:0] Variable length, minimum size depends on the indicated
Serial Bus Type (see above).
Byte 11 Type Data Length, bits [15:8] Variable length, minimum size depends on the indicated
Serial Bus Type (see above).
Byte 12 Type Specific Data (Optional) Data specific to the serial bus connection type
indicated in Serial Bus Type (see above).
… … Additional data specific to the serial bus connection type.
374 April, 2015 Version 6.0