These signals are tunneled between the 2 components over eSPI. Sideband and GPIO Pins: System events and other dedicated signals between the PCH and eSPI slave.The Virtual Wire channel uses a standard message format to communicate several types of signals between the components on the platform. Virtual Wire Channel (Channel 1) Overview Tunnel all Accesses from the eSPI Slave to the Host: These include Memory Reads and Writes.The programmable ranges and their enables reside in the PCI Configuration space. These include various programmable and fixed I/O ranges as well as programmable Memory ranges. Tunnel all Host to eSPI Slave (EC/SIO) Debug Device Accesses: These are the accesses that used to go over the LPC bus.These registers are mostly accessed via the BIOS, though some are accessed via the OS as well. Target for PCI Device D31:F0: The eSPI controller duplicates the legacy LPC PCI Configuration space registers.The Peripheral channel performs the following functions: Private Configuration Space Target Port ID.USB Dual Role Support - eXtensible Device Controller Interface (xDCI) Controller.eXtensible Host Controller Interface (xHCI) Controller.16550 8-bit Addressing - Debug Driver Compatibility.UART Serial (RS-232) Protocols Overview.Intel® Serial I/O Universal Asynchronous Receiver/Transmitter (UART) Controllers.Intel® Serial IO Generic SPI (GSPI) Controllers.VCCSPI Voltage (3.3 V or 1.8 V) Selection.Host System Management Bus (SMBus) Controller.Advanced Host Controller Interface (AHCI) Operation.Intel® Rapid Storage Technology (Intel® RST).Legacy Power Management Theory of Operation.System Power Supplies, Planes, and Signals.Single - Root I/O Virtualization (SR - IOV).Separate Reference Clock with Independent SSC (SRIS).PCI Express* Port Support Feature Details.ISH Interrupt Handling via IOAPIC (Interrupt Controller).Intel® Serial I/O Inter-Integrated Circuit (I2C) Controllers.Enhanced Serial Peripheral Interface eSPI.Embedded DisplayPort* (eDP*/MIPI*) Backlight Control Signals.External CL_RST# Pin Driven/Open-drained Mode Support.Direct Attached Digital Microphone (PDM) Interface.Intel® High Definition Audio Interface Capabilities.Intel® High Definition Audio (Intel® HD Audio) Controller Capabilities.

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