Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
12.3.3 Burst Enable Embedded Controller, BE_EC (0x82)........................................ 641
12.3.4 Burst Disable Embedded Controller, BD_EC (0x83)....................................... 642
12.3.5 Query Embedded Controller, QR_EC (0x84).................................................. 642
12.4 SMBus Host Controller Notification Header (Optional), OS_SMB_EVT ..................... 642
12.5 Embedded Controller Firmware .................................................................................. 642
12.6 Interrupt Model............................................................................................................643
12.6.1 Event Interrupt Model...................................................................................... 643
12.6.2 Command Interrupt Model .............................................................................. 644
12.7 Embedded Controller Interfacing Algorithms .............................................................. 644
12.8 Embedded Controller Description Information ............................................................ 645
12.9 SMBus Host Controller Interface via Embedded Controller....................................... 645
12.9.1 Register Description........................................................................................ 646
12.9.2 Protocol Description ........................................................................................ 650
12.10 SMBus Devices......................................................................................................... 655
12.10.1 SMBus Device Access Restrictions .............................................................. 656
12.10.2 SMBus Device Command Access Restriction .............................................. 656
12.11 Defining an Embedded Controller Device in ACPI Namespace ............................... 656
12.11.1 Example: EC Definition ASL Code ............................................................... 657
12.12 Defining an EC SMBus Host Controller in ACPI Namespace................................... 658
12.12.1 Example: EC SMBus Host Controller ASL-Code .......................................... 658
13
ACPI System Management Bus Interface Specification ......................... 661
13.1 SMBus Overview ........................................................................................................ 661
13.1.1 SMBus Slave Addresses................................................................................. 661
13.1.2 SMBus Protocols............................................................................................. 662
13.1.3 SMBus Status Codes ...................................................................................... 663
13.1.4 SMBus Command Values ............................................................................... 663
13.2 Accessing the SMBus from ASL Code ....................................................................... 663
13.2.1 Declaring SMBus Host Controller Objects ...................................................... 663
13.2.2 Declaring SMBus Devices............................................................................... 664
13.2.3 Declaring SMBus Operation Regions ............................................................. 664
13.2.4 Declaring SMBus Fields.................................................................................. 666
13.2.5 Declaring and Using an SMBus Data Buffer ................................................... 668
13.3 Using the SMBus Protocols ........................................................................................ 669
13.3.1 Read/Write Quick (SMBQuick)........................................................................ 669
13.3.2 Send/Receive Byte (SMBSendReceive) ......................................................... 670
13.3.3 Read/Write Byte (SMBByte)............................................................................ 671
13.3.4 Read/Write Word (SMBWord)......................................................................... 672
13.3.5 Read/Write Block (SMBBlock) ........................................................................ 672
13.3.6 Word Process Call (SMBProcessCall) ............................................................ 673
13.3.7 Block Process Call (SMBBlockProcessCall) ................................................... 674
14
Platform Communications Channel (PCC)............................................... 675
14.1 Platform Communications Channel Table .................................................................. 675
14.1.1 Platform Communications Channel Global Flags ........................................... 676
14.1.2 Platform Communications Channel Subspace Structures .............................. 676
xxiv April, 2015 Version 6.0