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| -rw-r--r-- | docs/ec_terms.md | 20 | ||||
| -rw-r--r-- | docs/usb-c.md | 10 |
2 files changed, 30 insertions, 0 deletions
diff --git a/docs/ec_terms.md b/docs/ec_terms.md index b34c138f05..6a19b4e055 100644 --- a/docs/ec_terms.md +++ b/docs/ec_terms.md @@ -64,6 +64,10 @@ switching, sensor management, and other functions, offloading these tasks from the [AP](#ap). +* **E-Mark - Electronically Marked Cable** {#emark} + + See the [USB-C documentation](./usb-c.md#emark) for more details. + * **eSPI - Enhanced Serial Peripheral Interface (Intel)**{#espi} Intel's synchronous communication interface between the [AP](#ap) and the @@ -71,6 +75,13 @@ bandwidth up to 264 Mbps. The full [eSPI Specification] is available from Intel. +* **GMR - Giant Magnetoresistance Sensor** {#gmr} + + A sensor device that detects a magnetic field. These sensors differ from + [MAG](#mag) sensors, in that they only detect magnetic fields in close + proximity to the sensor. On Chromebooks, GMR sensors are used to detect when + the lid is opened. On convertible Chromebooks, the GMR sensor also detects tablet mode when lid the is opened a full 360 degrees. + * **GPIO - General Purpose Input/Output**{#gpio} An individual signal that can independently controlled and read. GPIOs are @@ -97,6 +108,10 @@ of 100 KHz and 400 KHz. The full [I2C Specification] is available from NXP (formerly Phillips). +* **LED - Light Emitting Diode**{#led} + + A Light Emitting Diode is a semiconductor that emits light when current flows through it. + * **LPC - Low Pin Count bus**{#lpc} Legacy communication bus between the [AP](#ap) and [EC](#ec). Runs at 33 @@ -172,6 +187,11 @@ second). Typical use is to provide a debug console to the EC. [RS-232] is the protocol standard used by UARTs. +* **VCONN - Connector Voltage** {#vconn} + + See the [USB-C documentation](./usb-c.md#vconn) for more details. + + [BC 1.2 Specification]: <https://www.usb.org/document-library/battery-charging-v12-spec-and-adopters-agreement> [CrOS Board Info]: <https://chromium.googlesource.com/chromiumos/docs/+/master/design_docs/cros_board_info.md> [CEC Wikipedia page]: <https://en.wikipedia.org/wiki/Consumer_Electronics_Control> diff --git a/docs/usb-c.md b/docs/usb-c.md index 79b3145bdf..d6327d6dc7 100644 --- a/docs/usb-c.md +++ b/docs/usb-c.md @@ -75,6 +75,16 @@ Modes in the EC codebase. * Downstream Facing Port. The USB Data role that is typical for a host machine (e.g. device running ChromeOS). +* E-Mark {#emark} + * Electronically marked cable. A USB-C cable that contains an embedded + chip in the cable, used to identify the capabilities of the cable. + +* VCONN {#vconn} + * Connector Voltage. A dedicated power supply rail for [E-Mark](#emark) + cables and other accessory functions (such as display dongles, and + docks). VCONN re-uses one of the CC1/CC2 signals to provide 5 volt, 1 + watt, of power. + ## Different PD stacks Right now platform/ec has two different implementations of USB-C PD stack. |