From bbdcd94a3d4418e7db333ee02d17db6652828dde Mon Sep 17 00:00:00 2001 From: "Mark D. Studebaker" Date: Sat, 15 Jan 2000 19:10:07 +0000 Subject: [PATCH] (mds) add Banshee and DDC information. git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@699 7894878c-1315-0410-8ee3-d5d059ff63e0 --- doc/busses/i2c-voodoo3 | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-) diff --git a/doc/busses/i2c-voodoo3 b/doc/busses/i2c-voodoo3 index b1f4cf2f..8344b8ce 100644 --- a/doc/busses/i2c-voodoo3 +++ b/doc/busses/i2c-voodoo3 @@ -4,11 +4,11 @@ Status: 'Beta' and still under development and testing Supported adapters: * 3dfx Voodoo3 based cards - * Voodoo Banshee based cards? + * Voodoo Banshee based cards Author: Frodo Looijaard , Philip Edelbrock - , and Ralph Metzler - + , Ralph Metzler , + and Mark D. Studebaker Main contact: Philip Edelbrock @@ -24,8 +24,17 @@ Module Parameters Description ----------- -The 3dfx Voodoo3 chip contains an I2C interface/driver (aka a I2C 'master' -or 'host'). The intent by 3dfx was to allow manufacturers to add extra +The 3dfx Voodoo3 chip contains two I2C interfaces (aka a I2C 'master' +or 'host'). + +The first interface is used for DDC (Data Display Channel) +which is a serial channel through the VGA monitor connector +to a DDC-compliant monitor. This interface is defined by the +Video Electronics Standards Association (VESA). The standards +are available for purchase at http://www.vesa.org . + +The second interface is a general-purpose I2C bus. +The intent by 3dfx was to allow manufacturers to add extra chips to the video card such as a TV-out chip such as the BT869 or possibly even I2C based temperature sensors like the ADM1021 or LM75. @@ -40,16 +49,16 @@ Stability Seems to be stable on the test machine, but needs more testing on other machines. +Simultaneous accesses of the DDC and I2C busses may cause errors. + Supported Devices ----------------- Specifically, this driver was written and tested on the '3dfx Voodoo3 AGP 3000' which has a tv-out feature (s-video or composite). According to the docs and discussions, this code should work for any Voodoo3 based cards as -well as Voodoo Banshee based cards. Voodoo Banshee cards, however, are not -probed or detected until I can find a test user to help out in the testing, -so please contact me (phil@netroedge.com) if you have a Banshee and want -to help. +well as Voodoo Banshee based cards. The DDC interface has been tested +on a Voodoo Banshee card. Features --------