MoBo I/O: Difference between revisions

From OLPC
Jump to navigation Jump to search
(Initiated page.)
 
(Backup - saving progress)
Line 1: Line 1:
Many [re]purposes and debug efforts could aided by a comprehensive description of the various low level protocols available on the XO motherboard.
Many [re]purposes and debug efforts could aided by a comprehensive description of the various low level protocols available on the XO motherboard.
There are a variety of headless and headed connectors visible on the XO. The following is an attempt to identify them completely.
There are a variety of headless and headed connectors visible on the XO. The following is an attempt to identify them completely.
= Identifying Connectors =
*
* Headless
** [[Serial_adapters#Console/Serial connector -J1|CN24 - top left of backup battery]]
** CN31 - top right of backup battery
** CN19 - above RAM & "3.3V" label
** CN1 - front side of motherboard, right of MIC jack
** CN34 - below MIC header
* Headed
=== Back ===
** [[Serial_adapters#Console/Serial connector -J1|J1 - top left of southbridge]]
** CN23 - right of SD slot
*** Keyboard connector - LV PS/2
** CN22 - bottom left of backup battery
*** 1-wire(microlan) interface for battery
** CN21 - bottom right of CN22
*** PWR in from battery
** CN26+CN25 - below left and right bottom USB port, respectively
*** Speaker headers
=== Front ===
** CN28 - right of MIC jack
*** backlight
** CN15 - right of MIC-jack side USB plug
*** MIC header
** CON4 - bottom of USB plugs on L side of mobo

The XO motherboard also features several standard high and low level protocols.
The XO motherboard also features several standard high and low level protocols.
* I2C
* I2C
** Theoretically used for the DCON - A datasheet should be obtained for the Himax HX8837 chip and the I2C pins/traces should be identified.
** Theoretically used for the DCON - A datasheet should be obtained for the Himax HX8837 chip and the I2C pins/traces should be identified.
** /dev/i2c-0
* 3.3v TTL Serial
* 3.3v TTL Serial
** Easily accessible using a 3.3v level converter and a [http://www.usdigital.com/products/cables-connectors/cables/4-pin/ca-mic4-sh-nc/ | proper cable.]
** Easily accessible using a [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2008 3.3v level converter] and a [http://www.usdigital.com/products/cables-connectors/cables/4-pin/ca-mic4-sh-nc/ proper cable].
** /dev/ttyS0

== Tidbits ==
* Python, C, or SH code to toggle the VGA GPIO is wanted

Revision as of 01:17, 8 July 2008

Many [re]purposes and debug efforts could aided by a comprehensive description of the various low level protocols available on the XO motherboard. There are a variety of headless and headed connectors visible on the XO. The following is an attempt to identify them completely.

Identifying Connectors

  • Headless
    • CN24 - top left of backup battery
    • CN31 - top right of backup battery
    • CN19 - above RAM & "3.3V" label
    • CN1 - front side of motherboard, right of MIC jack
    • CN34 - below MIC header
  • Headed

Back

    • J1 - top left of southbridge
    • CN23 - right of SD slot
      • Keyboard connector - LV PS/2
    • CN22 - bottom left of backup battery
      • 1-wire(microlan) interface for battery
    • CN21 - bottom right of CN22
      • PWR in from battery
    • CN26+CN25 - below left and right bottom USB port, respectively
      • Speaker headers

Front

    • CN28 - right of MIC jack
      • backlight
    • CN15 - right of MIC-jack side USB plug
      • MIC header
    • CON4 - bottom of USB plugs on L side of mobo

The XO motherboard also features several standard high and low level protocols.

  • I2C
    • Theoretically used for the DCON - A datasheet should be obtained for the Himax HX8837 chip and the I2C pins/traces should be identified.
    • /dev/i2c-0
  • 3.3v TTL Serial

Tidbits

  • Python, C, or SH code to toggle the VGA GPIO is wanted
Retrieved from "http://wiki.laptop.org/mediawiki/index.php?title=MoBo_I/O&oldid=143364"