Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Offset Field Name Definition
… … Additional data specific to the serial bus connection
type.
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 6-191 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.
Hewlett-Packard/Intel/Microsoft/Phoenix/Toshiba 343