1 Designing for DVI General Applications Considerations

2 Design Issues to Consider Layout Recommendations Power supply considerations EMC considerations Layout Recommendations Power supply considerations EMC considerations

3 Layout Recommendations Route differential pairs together Avoid excessive or asymmetric vias

4 Layout Recommendations (contd) Series damping resistors on data, clock, control signal inputs to TX Reduces signal ringing, noise GPU

5 Layout Recommendations (contd) Four layer PCB -Solid ground plane Four layer PCB -Solid ground plane Common-Mode Current IC Signal GND IC Signal Lines Cut in GND or poor HF contact

6 GND Plane Return Current Signal Layout Considerations (contd) Return Current GND Plane High Emissions Trace Signal Low Emissions

7 Power Supply Considerations Voltage regulator on TX PVCC supply Switch-mode Power Supply PVCC, PVCC2 +5V +3.3V Switching Noise ~45-60KHz Switching noise can cause PLL jitter -VREG greatly reduces supply noise Switching noise can cause PLL jitter -VREG greatly reduces supply noise

8 EMC Considerations Even though PanelLink operates at over 1GHz, most emissions are still caused by parallel data Some high frequency emissions near 1GHz are possible, but are related to mechanical contact Even though PanelLink operates at over 1GHz, most emissions are still caused by parallel data Some high frequency emissions near 1GHz are possible, but are related to mechanical contact

9 EMC Considerations: Data Lines Damping resistors, short data path Minimize Length

10 EMC Considerations: Ground Contact Good, broad contact between connector shells and the I/O bracket Broad contact between the I/O bracket and the system chassis Good 360 o contact between connector shell and cable shield Good contact between motherboard GND and chassis Helps with high frequency emissions Broad contact Between connector And Bracket Good contact between Shield and connector Shell Solid contact between Bracket and chassis

11 EMC Considerations: Ground Contact The chassis is the common GND reference -Do not have floating grounds The chassis is the common GND reference -Do not have floating grounds PCB GND 2 Signal GND/RTN Monitor PCB GND Monitor PCB GND Shielding Host Chassis Host Chassis PCB GND 2 PCB GND 1 Cable Shield Display Chassis Display Chassis

12 Ground Contact: Example Cable Shield 360 Clamps or Connector Shells Main ChassisRemote Chassis PCB 1 PCB 3 Shielding PCB 2 Shielding Signal & GND (Return)

13 Summary Voltage regulator strongly recommended on TX PVCC Damping resistors on all parallel data lines -Improves signal integrity and EMI Solid ground plane Use chassis as common GND reference Voltage regulator strongly recommended on TX PVCC Damping resistors on all parallel data lines -Improves signal integrity and EMI Solid ground plane Use chassis as common GND reference

14 Conclusion PanelLink is very robust, but is still a high- speed gigabit serial link -Higher data rate than gigabit ethernet Reference schematics provided Silicon Image is the leader in experience and knowledge of this technology -Applications knowledge -Local and factory support -Production and testing PanelLink is very robust, but is still a high- speed gigabit serial link -Higher data rate than gigabit ethernet Reference schematics provided Silicon Image is the leader in experience and knowledge of this technology -Applications knowledge -Local and factory support -Production and testing