Specification Update 3
Contents
1 Introduction .................................................................................................... 6
1.1 Terminology ......................................................................................... 7
1.2 Reference Documents ............................................................................ 7
2 Form Factor Overview ....................................................................................... 8
3 Mechanical Requirements .................................................................................. 9
3.1 Motherboard Size and Mounting Hole Placement ........................................ 9
3.2 Volumetric Zones ................................................................................ 11
3.2.1 Motherboard Volumetric Zones ................................................. 12
3.2.2 Chassis Volumetric Zones ........................................................ 15
3.3 Chassis Mechanical Interfaces ............................................................... 17
3.3.1 Chassis Interface for EMC Grounding ......................................... 17
3.3.2 Chassis Interface to Support and Retention Module ..................... 17
3.3.3 Chassis Interface to Thermal Module ......................................... 20
3.3.4 Chassis Real Panel I/O Interface Requirements ........................... 21
3.4 Motherboard Mechanical Interfaces ........................................................ 22
3.4.1 Motherboard Real Panel Interface Requirements ......................... 22
4 Electrical Interface Requirements ..................................................................... 23
4.1 Motherboard Power Supply Connectors ................................................... 23
4.2 Motherboard Power and Control Signal Definitions .................................... 24
4.2.1 +5VSB .................................................................................. 24
4.2.2 PS_ON# ............................................................................... 24
4.2.3 PWR_OK ............................................................................... 24
4.2.4 Voltage Tolerances ................................................................. 26
5 Addition Information ...................................................................................... 27
Figures
Figure 2-1. Example BTX Board and System Layouts ............................................. 8
Figure 3-1. BTX Form Factor Board and Mounting Hole Dimensions ....................... 10
Figure 3-2. Chassis and Motherboard Volumetric Zones (not all zones are shown) ... 11
Figure 3-3. Motherboard Primary Side Volumetric Zone ....................................... 13
Figure 3-4. Motherboard Secondary Side Volumetric Zones .................................. 14
Figure 3-5. Chassis Volumetric Zones ............................................................... 16
Figure 3-6. Chassis Interface to SRM Requirements ............................................ 18
Figure 3-7. Chassis Interface to SRM Requirement Details ................................... 19
Figure 3-8. Chassis to Thermal Module Interface and Relation to Chassis and
Motherboard Zones .................................................................................. 20
Figure 3-9. Chassis Requirements for Thermal Module Interface Definition ............. 21
Figure 3-10. Chassis Rear Panel I/O Interface Requirements ................................ 21
Figure 3-11. Motherboard Rear Panel I/O Interface Requirements ......................... 22
Figure 4-1. Power Supply Connectors ................................................................ 23
Figure 4-2. Power Timing ................................................................................ 25
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