文件名称：ATX主板标准结构
文件大小：276KB
文件格式：PDF
更新时间：2018-09-09 11:34:29
ATX
Contents 1. Executive Summary......................................................................................................7 2. ATX Form-factor Overview...........................................................................................8 3. Layout ............................................................................................................................9 3.1 Board Size......................................................................................................................................... 9 3.2 Mounting Hole Placement .................................................................................................................. 9 3.3 Connector Placement ........................................................................................................................ 11 3.3.1 Expansion slots ..................................................................................................................... 11 3.3.2 Power Input ........................................................................................................................... 13 3.3.3 Disk I/O ................................................................................................................................ 13 3.3.4 Front Panel I/O...................................................................................................................... 13 3.3.5 Back Panel I/O ...................................................................................................................... 13 3.3.6 Memory Sockets ................................................................................................................... 16 3.3.7 Processor .............................................................................................................................. 16 3.4 Height Constraints............................................................................................................................. 16 3.4.1 Primary (Component) Side Height Constraints..................................................................... 16 3.4.2 Secondary (Bottom/Solder) Side Height Constraints ............................................................ 18 4. Power Delivery ..............................................................................................................19 4.1 Power Supply Connectors.................................................................................................................. 19 4.1.1 Aux Power Connector for 250 W and 300 W Configurations ............................................... 20 4.1.2 2x2 Connector...................................................................................................................... 20 4.1.3 Power Signal Control Definitions........................................................................................... 20 4.1.4 Voltage Tolerances ............................................................................................................... 21 4.2 Optional Power Connector ................................................................................................................. 21 4.2.1 FanM Signal .......................................................................................................................... 22 4.2.2 FanC Signal .......................................................................................................................... 22 4.2.3 3.3 V Sense Line................................................................................................................... 23 4.2.4 1394 V Pin............................................................................................................................ 23 4.2.5 1394R Pin ............................................................................................................................. 23 5. Other ATX Chassis Considerations.............................................................................24 5.1 Venting .............................................................................................................................................. 24 5.2 Power Supply Mounting ..................................................................................................................... 24 6. Additional Information ..................................................................................................24