Intel 740 - Page 4

iv Intel740™ Graphics Accelerator Design Guide
3 3 Device AGP MotherBoard Design ..........................................................................3-1
3.1 Introduction...................................................................................................3-1
3.1.1 Overview..........................................................................................3-1
3.1.2 About This Chapter..........................................................................3-2
3.1.3 Block Diagram .................................................................................3-2
3.1.4 Implementation Issues.....................................................................3-3
3.1.4.1 Disabling A Master Device .............................................3-3
3.1.4.2 Low Power Logic Implementation...................................3-4
3.1.4.3 GPO27# and GPO28# Signal Duration..........................3-5
3.1.5 State Diagrams ................................................................................3-5
3.1.5.1 Signal Quality and Timing Issues ...................................3-6
3.1.5.2 Strobe Edge Quality Issues............................................3-7
3.1.5.3 Clock Issues ...................................................................3-7
3.1.6 Design Recommendations...............................................................3-9
3.1.6.1 Voltage Definitions..........................................................3-9
3.1.6.2 General Design Recommendation .................................3-9
3.2 3 Device AGP Motherboard Layout and Routing Guidelines........................3-9
3.2.1 BGA Quadrant Assignment ...........................................................3-10
3.2.2 Board Description ..........................................................................3-12
3.2.3 3-point AGP Design Guidelines .....................................................3-12
3.2.3.1 Layout and Routing ......................................................3-12
3.2.3.2 Data and strobe definitions...........................................3-13
3.2.3.3 Assumptions for Board Design Guidelines...................3-14
3.2.3.4 Add-in Card guideline assumptions:.............................3-14
3.2.3.5 Motherboard Guideline Assumptions ...........................3-14
3.2.3.6 3-Load AGP Topology..................................................3-16
3.2.3.7 Overall Solution Space.................................................3-16
3.2.4 Intel740™ Graphics Accelerator Memory Layout and
Routing Guidelines ........................................................................3-18
3.2.4.1 3 Device AGP Intel740™ Graphics Accelerator
Memory Configurations ................................................3-21
3.3 3 Device AGP Motherboard Reference Design Schematics ......................3-22
4 Thermal Considerations.............................................................................................4-1
5 Mechanical Information..............................................................................................5-1
5.1 Board Dimensions ........................................................................................5-1
5.2 Fan/Heatsink Hole Pattern............................................................................5-1
5.3 VMI Header Placement.................................................................................5-2
5.4 50 Pin Video Connector................................................................................5-3
5.5 Bracket..........................................................................................................5-4
5.6 NLX Considerations......................................................................................5-5
6 Third Party Vendors...................................................................................................6-1
6.1 Voltage Regulator .........................................................................................6-1
6.2 50 Pin Connector ..........................................................................................6-1
6.3 Fan/Heatsink.................................................................................................6-1
6.4 Flash Components........................................................................................6-1
6.5 Video Encoders/Decoders ............................................................................6-1
6.6 DVD Daughter Cards....................................................................................6-2
6.7 TV Tuner.......................................................................................................6-2
A Application Notes
B Reference Information