Kontron COMe Starterkit Eval T2 - Manual (Page 216)

Appendix D: List of Figures
Figure 48: System Management Bus Separation............................................................................................123
Figure 49: General Purpose Serial Port Example ..........................................................................................126
Figure 50: CAN Bus Example..........................................................................................................................128
Figure 51: Module Type 2 Detection Circuitry..................................................................................................130
Figure 52: Speaker Output Circuitry................................................................................................................131
Figure 53: RTC Battery Circuitry with Serial Schottky Diode...........................................................................132
Figure 54: Watchdog Timer Event Latch Schematic.......................................................................................135
Figure 55: General Purpose I/O Loop-back Schematic...................................................................................137
Figure 56: SDIO Interface Multiplexed with GPIOs.........................................................................................139
Figure 57: Fan Connector Reference Schematic............................................................................................140
Figure 58: Protecting Logic Level Signals on Pins Reclaimed from VCC_12V..............................................143
Figure 59: PCI Bus Interrupt Routing...............................................................................................................147
Figure 60: PCI Device Down Example; Dual UART........................................................................................148
Figure 61: PCI Clock Buffer Circuitry...............................................................................................................149
Figure 62: Connector type: 40 pin, 2 row 2.54mm grid female.......................................................................152
Figure 63: IDE 40 Pin and CompactFlash 50 Pin Connector..........................................................................153
Figure 66: AT and ATX Power Supply, Type 2 Detection.................................................................................163
Figure 67: COM Express Carrier Board Connectors.......................................................................................169
Figure 68: Four-Layer Stack-up.......................................................................................................................171
Figure 69: Six-Layer Stack-up.........................................................................................................................171
Figure 70: Eight-Layer Stack-up......................................................................................................................172
Figure 71: Microstrip Cross Section.................................................................................................................174
Figure 72: Strip Line Cross Section.................................................................................................................174
Figure 73: Trace-length extension with signal conditioning chip.....................................................................175
Figure 74: Layout Considerations....................................................................................................................177
Figure 75: Mechanical comparison of available COM Express Form Factors................................................190
Figure 76: Complete assembly using non-threaded (bore hole) heatspreader...............................................192
Figure 77: Complete assembly using threaded heatspreader........................................................................193
Figure 78: TV-Out Video Connector (combined S-Video and Composite)......................................................199
Figure 79: TV-Out Reference Schematics.......................................................................................................201
Figure 80: LPC Firmware Hub.........................................................................................................................203
PICMG ® COM Express ® Carrier Board Design Guide Rev. 2.0 / December 6, 2013
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