1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
2<HTML>
3<HEAD>
4<META http-equiv="Content-Type" content="text/html; charset=windows-1252">
5<META http-equiv="Content-Style-Type" content="text/css">
6<LINK rel="stylesheet" type="text/css" href="../CSS/revolution.css">
7<TITLE>GP Command Templates</TITLE>
8</HEAD>
9<BODY>
10<H1 align="left">GP Command Templates</H1>
11<H2>Description</H2>
12<P>The Graphics Processor (GP) has 4 basic command types:</P>
13<H3>CP Commands</H3>
14<P>These commands are used to write to CP registers. All CP commands have the following format:</P>
15<PRE>| 8 bits     | 8 bits     | 32 bits    |
16| cmd. token | reg. addr. | reg. value |</PRE>
17<P>CP has its own unique register address space.</P>
18<H3>XF Immediate Commands</H3>
19<P>These commands are used to write XF registers. All immediate XF commands have the following format:</P>
20<PRE>| 8 bits     | 16 bits    | 16 bits   | 32 bits * length |
21| cmd. token | length - 1 | 1st addr. | reg. value(s)    |</PRE>
22<P>Maximum length (the number of values being sent) is 16.<br>Note that a length field of 0 indicates that data is to be sent to Register 1.<br></P>
23<P><br> XF has its own unique register address space.</P>
24<H3>XF Indexed Commands</H3>
25<P>These commands are also used to write XF registers. There are 4 different XF index units that are typically used in the following ways:</P>
26<UL>
27<LI>A: position coordinate matrices
28<LI>B: normal matrices
29<LI>C: texture coordinate generation matrices
30<LI>D: light objects
31</UL>
32<P>All indexed XF commands have the the following format:</P>
33<PRE>| 8 bits     | 16 bits     | 4 bits     | 12 bits   |
34| cmd. token | index value | length - 1 | 1st addr. |</PRE>
35<P>Maximum length (the number of values being sent) is 16.<br>Note that a length field of 0 indicates that data is to be sent to Register 1, and so on.<br></P>
36<P>XF has its own unique register address space.</P>
37<H3>BP Commands</H3>
38<P>These commands are used to write all bypass (raster state) registers (SU through PE).<br>All BP commands have the following format:</P>
39<PRE>| 8 bits     | 8 bits     | 24 bits    |
40| cmd. token | reg. addr. | reg. value |</PRE>
41<P>When specifying a BP command, the register address and value are combined into a single U32 value.<br></P>
42<P>BP has its own unique register address space.</P>
43<H2>Revision History</H2>
44<P>03/01/2006 Initial version.</P>
45</BODY>
46</HTML>