Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
String Resource Source Name of the serial bus controller device to which this
connection descriptor applies. The name can be a fully
qualified path, a relative path, or a simple name segment
that utilizes the namespace search rules.
6.4.3.8.2.1 I2C Serial Bus Connection Resource Descriptor
Table 6-220 I2C Serial Bus Connection Descriptor
Offset Field Name Definition
Byte 0
I2C Bus Connection
Descriptor
Value = 0x8E (10001110B) – Type = 1, Large item name
= 0x0E
Byte 1 Length, bits [7:0] Variable length, minimum value = 0xF + L (15 +
ResourceSource string length)
Byte 2 Length, bits [15:8] Variable, length minimum value = 0x00
Byte 3 Revision ID Indicates the revision for the I2C Resource Descriptor.
This value is 1.
Byte 4 Resource Source Index Reserved (must be 0)
Byte 5 Serial Bus Type Serial Bus Type value must be 1 for I2C
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. _SLV
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] Bits[7:1]
Reserved. Must be 0.
Bit [0]
10-bit addressing mode. _MOD
0x1: The connection uses 10-bit addressing
0x0: The connection uses 7-bit addressing.
Byte 8
Type Specific Flags,
Reserved. Must be 0.
bits[15:8]
Byte 9 Type Specific Revision ID Indicates the revision of the I2C-specific Serial Bus
Connection Descriptor Data. This value is 1.
Version 6.0 375