Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Offset Field Name Definition
Byte 10 Type Data Length, bits[7:0] Variable length, minimum value = 0x6 (6).
Byte 11 Type Data Length, bits [15:8] Variable length, minimum size = 0x0 (0)
Byte 12 Connection Speed, bits [7:0] Connection speed bits [7:0] of the maximum speed in
hertz supported by this connection. _SPE[7:0]
Byte 13 Connection Speed, bits [15:8] Connection speed bits [15:8] of the maximum speed in
hertz supported by this connection. _SPE[15:8]
Byte 14 Connection Speed, bits
[23:16]
Connection speed bits [23:16] of the maximum speed in
hertz supported by this connection. _SPE[23:16]
Byte 15
Connection Speed, bits
[31:24]
Connection speed bits [31:24] of the maximum speed in
hertz supported by this connection. _SP[31:24]
Byte 16 Slave Address, bits [7:0] Lower eight bits of the I2C bus address for this
connection. _ADR[7:0]
Bit [7]
In 7-bit addressing mode this is reserved and must be 0.
In 10-bit addressing mode this is bit 7 of the address.
Bits [6:0]
The lowest 7 bits of the address. In 7-bit addressing
mode this represents the complete address.
Byte 17 Slave Address, bits[15:8] Upper eight bits of the I2C bus address for this
connection. The upper eight bits are to support 10-bit
addressing and should be set to 0 if 7-bit addressing is
being used. _ADR[15:8]
Bits [15:10]
Reserved. Must be 0.
Bits [9:8]
In 7-bit addressing mode these are reserved and must be
0. In 10-bit addressing mode these are the highest two
bits of the address.
Byte 18 Vendor-defined Data (Optional) Data specific to the controller device supplied
by a vendor. The number of bytes in this field is Type
Data Length – 6.
… … (Optional) Additional vendor supplied data.
String Resource Source (Length =
L)
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
6.4.3.8.2.2 SPI Serial Bus Connection Resource Descriptor
Table 6-221 SPI Serial Bus Connection Descriptor
Offset Field Name Definition
Byte 0 SPI Bus Connection Value = 0x8E (10001111B) – Type = 1, Large item name =
Descriptor
0x0E
376 April, 2015 Version 6.0