Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
Byte 1 Length, bits[7:0] Variable length, minimum value = 0x12 + L (18 + Resource
Source string length)
Byte 2 Length, bits[15:8] Variable length, minimum value = 0x00
Byte 3 Revision ID Indicates the revision of the Serial Bus Connection 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 2 for SPI
Byte 6 General Flags[7:0] Flags that are common to all serial bus connection types.
Bits [7:2]
Reserved. Must be 0.
Byte 7
Type Specific Flags,
bits[7:0]
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.
Bits [7:2]
Reserved (must be 0)
Bit [1]: Device Polarity. _DPL
1 – The device selection line is active high
0 – The device selection line is active low
Bit [0]: Wire Mode. _MOD
1 – The connection is over 3 wires
0 – The connection is over 4 wires
Byte 8 Type Specific Flags, Reserved. Must be 0.
bits[15:8]
Byte 9 Type Specific Revision ID Indicates the revision of the SPI-specific Serial Bus
Connection Descriptor Data. This value must be 1.
Byte 10 Type Data Length, bits[7:0] Variable length, minimum value = 0x9 (9).
Byte 11 Type Data Length, bits
[15:8]
Variable length, minimum size = 0x0 (0)
Byte 12
Byte 13
Byte 14
Byte 15
Connection Speed, bits
[7:0]
Connection Speed, bits
[15:8]
Connection Speed, bits
[23:16]
Connection Speed, bits
[31:24]
Connection speed bits [7:0] of the maximum speed in hertz
supported by this connection. _SPE[7:0]
Connection speed bits [15:8] of the maximum speed in hertz
supported by this connection. _SPE[15:8]
Connection speed bits [23:16] of the maximum speed in hertz
supported by this connection. _SPE[23:16]
Connection speed bits [31:24] of the maximum speed in hertz
supported by this connection. _SPE[31:24]
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