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Designing for DVI
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Transcript of Designing for DVI
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Designing for DVIDesigning for DVI
General Applications ConsiderationsGeneral Applications Considerations
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Design Issues to ConsiderDesign Issues to Consider
• Layout Recommendations
• Power supply considerations
• EMC considerations
• Layout Recommendations
• Power supply considerations
• EMC considerations
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Layout RecommendationsLayout Recommendations
• Route differential pairs together• Route differential pairs together
• Avoid excessive or asymmetric vias• Avoid excessive or asymmetric vias
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Layout Recommendations (cont’d)Layout Recommendations (cont’d)
• Series damping resistors on data, clock, control signal inputs to TX
• Series damping resistors on data, clock, control signal inputs to TX
• Reduces signal ringing, noise• Reduces signal ringing, noise
GPU
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Layout Recommendations (cont’d)Layout Recommendations (cont’d)
• Four layer PCB- Solid ground plane
• Four layer PCB- Solid ground plane
Common-ModeCurrent
ICSignal
GND
ICSignal Lines
Cut in GND or poor HF contact
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GND Plane
Return Current
Signal
Layout Considerations (cont’d)Layout Considerations (cont’d)
Return Current
GND Plane
High Emissions
Trace
Signal
Low Emissions
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Power Supply ConsiderationsPower Supply Considerations
• Voltage regulator on TX PVCC supply• Voltage regulator on TX PVCC supply
Switch-modePower 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
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EMC ConsiderationsEMC 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
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EMC Considerations: Data LinesEMC Considerations: Data Lines
• Damping resistors, short data path• Damping resistors, short data path
MinimizeLength
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EMC Considerations: Ground ContactEMC Considerations: Ground Contact
Good, broad contact between connector shells and the I/O bracketBroad contact between the I/O bracket and the system chassisGood 360
o contact between connector shell and cable shield
Good contact between motherboard GND and chassisHelps with high frequency emissions
Broad contactBetween connectorAnd Bracket
Good contact betweenShield and connectorShell
Solid contact betweenBracket and chassis
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EMC Considerations: Ground ContactEMC 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 2PCB GND 2Signal GND/RTN
MonitorPCB GND
MonitorPCB GND
ShieldingShieldingShieldingShielding HostChassis
HostChassis
PCB GND 2PCB GND 2
PCB GND 1PCB GND 1
Cable Shield
DisplayChassis
DisplayChassis
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Ground Contact: ExampleGround Contact: Example
Cable Shield
360 Clampsor ConnectorShells
Main Chassis Remote Chassis
PCB 1 PCB 3
Shielding
PCB 2
Shielding
Signal &GND (Return)
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SummarySummary
• 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
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ConclusionConclusion
•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