Jump to content
Toggle sidebar
JookWiki
Search
Create account
Log in
Personal tools
Create account
Log in
Pages for logged out editors
learn more
Contributions
Talk
Navigation
Main page
Recent changes
Random page
All pages
Help about MediaWiki
Tools
What links here
Related changes
Special pages
Page information
Editing
AMD Geode/Video 1/Script
(section)
Page
Discussion
English
Read
Edit
Edit source
View history
More
Read
Edit
Edit source
View history
Warning:
You are not logged in. Your IP address will be publicly visible if you make any edits. If you
log in
or
create an account
, your edits will be attributed to your username, along with other benefits.
Anti-spam check. Do
not
fill this in!
== Reading manuals == A manual is shown titled "PCM-9375 3.5" SBC w/AMD LX800, VGA, LCD, LAN, USB2.0 and SSD User Manual" Voice: "Without any obvious faults I decided to look at the user manual." A page is shown mentioning section 2.1.5 TV "enable (J5)" with a table showing that you can enable or disable the TV setting with a jumper, but by default it is enabled. Voice: "It mentions a TV enable jumper, but on my board that just stopped it booting." A page with section 4.4.1 "Display type" is shown, explaining that the board can be configured as a CRT, flat panel, or both. Dual display is default. Changing the setting requires entering the BIOS or contacting Advantech's technical support center. Voice: "The VGA section says I need to use the BIOS to configure the video output." A page with default BIOS settings is shown, with the "Output Display" option defaulting to "CRT". Voice: "The BIOS section says it's configured to use the VGA output by default." A page with a table for connecting wires between a Sharp LQ121S1DG31 LCD and PCM-9375 board to get LCD output is shown. Voice: "The LCD section just shows how to connect a particular display." A manual is shown titled "AMD Geode LX Processors Data Book". Voice: "Let's look at the Geode data book." A page of the manual shows a complex block diagram explaining how the video processor module works, with arrows exiting the module and pointing to an 'output devices' block with the elements "VIP, TV Encoder, CRT DAC (3x8 bit), TFT Panel, AMD Geode Companion Device" listed in it. Voice: "The VGA display seems to be driven by the video processor block." Another page of the manual shows that YUV444 or RGB888 or RGB data is mixed and blended then send to the DAC then to the CRT. Voice: "The video signal is output by an 8-bit digital to analog converter." A page shows a table of signals and their types, including HSYNC, VSYNC, DVREF, DRSET, DAVdd, DAVss, RED, GREEN. Voice: "The DAC needs a 1.235 volt voltage reference and a 1.21K ohm current setting resistor." A page shows a download page of the file XO-1-Schematics.pdf with the description "Schematics for the C2 version of the XO-1 Laptop". Voice: "I looked up other schematics online for boards that use the Geode. I found the OLPC XO-1 board." A screenshot of schematics relating to the DVREF, DRSET and DAVdd and DAVss pins is displayed. In order to generate 1.235 volts a resistor divider is used based on the 3.3 volt rail, with various bypass capacitors smoothing out the 3.3 volt rail and feeding it to the DAV pins. The DRSET pin has a 1.21 kiloohm resistor connected between it and ground. Voice: "Looking at the schematic I figure if anything's going to break it would be the voltage divider used for DVREF."
Summary:
Please note that all contributions to JookWiki are considered to be released under the Creative Commons Zero (Public Domain) (see
JookWiki:Copyrights
for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource.
Do not submit copyrighted work without permission!
To edit this page, please answer the question that appears below (
more info
):
Who owns this wiki?
Cancel
Editing help
(opens in new window)