Advanced Configuration and Power Interface Specification

Device Configuration
Offset Field Name Definition
Byte 6 General Flags [7:0] Flags that are common to all serial bus connection types.
Bits [17:2]
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.
Bit [7] – Endian-ness. _END
Little Endian = 0
Big Endian = 1
Bit [6:4] – Data bits. Number of bits per byte. _LEN
000B – 5 bits
001B – 6 bits
010B – 7 bits
011B – 8 bits
100B – 9 bits
Bits [3:2] – Stop Bits. Number of stop bits per character.
_STB
00B (0) – none
01B (1) – 1
10B (2) – 1.5
11B (3) – 2
Bits [1:0] – Flow control. Indicates type of flow control for the
connection. _FLC
00B (0) – None
01B (1) – Hardware flow control
10B (2) – XON/XOFF
Byte 8 Type Specific Flags, Reserved. Must be 0.
bits[15:8]
Byte 9 Type Specific Revision ID Indicates the revision of the UART-specific Serial Bus
Connection Descriptor Data. This value must be 1.
Byte 10 Type Data Length, bits[7:0] Variable length, minimum value = 0x0A (10).
Byte 11 Type Data Length, bits
[15:8]
Variable length, minimum size = 0x0 (0)
Byte 12 Default Baud rate, bits[7:0] Default baud rate of connection, in bits-per-second.
_SPE[7:0]
Bits [7:0]
Version 6.0 379