The compute module provides one PCI-Express 2.0 lane, and all required side-band signals, through the J7 connector.
Within the module, the primary PCI-Express signals are multiplexed with the USB3.0 interface; a BIOS setting determines if these lines functions as PCI-Express or USB3, a then BIOS must be re-flashed to change back and forth.
Installing standoffs at the expansion board mounting locations will help protect components on the bottom side of the board.
The Ref-OS-IoT uses the Advanced Linux Sound Architecture (ALSA) framework to deliver Audio features to application.
See http://alsa-project.org/main/index.php/Documentation for more information.
Audio Software Architecture shown below outlines the OS audio Stack which covers the following aspects:
Input devices like keyboards, mice and trackballs are commonly known as Human Interface Devices (HID). These can be enabled by scanning for devices and then completing the pairing operation.
Enable the agent:
[bluetooth]# agent on
Instruct the agent to start a scan for devices:
The pins on the Expansion Board breakout connectors can be mapped for different functions and purposes depending on the operating system used and the version of the BIOS.
The expansion board has two breakout connectors:
The Intel® Joule™ module uses two board-to-board connectors to separate communication buses, power, and GPIO signals to the expansion board. Module connectors J6 and J7 mate with Hirose* Electric Co LTD part number DF40C-100DS-0.4V or other compatible hardware.
To properly interface with the module, keep the board-to-board connectors parallel, and maintain 19 mm between long-edge centerlines and 15.5 mm between short-edge centerlines, as shown in the figure below.
Five I2C buses are available across the J6 and J7 board-to-board connectors:
J6 carries the signals for:
J7 carries the signals for the general purpose I2C_1 and I2C_2 buses.
A high-level block diagram for the expansion board is drawn in two parts for better readability.
The expansion board provides two clock signals on the breakout connectors, a 19.2 MHz clock and a 32.768 kHz real time clock (RTC). The following two sections provide the AC and DC specifications for both of these clock signals.
