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Brief Introduction to
DisplayPort™
Link-Training Tunable PHY Repeaters
2018-04-03
Link-Training Tunable PHY Repeaters
• What is a Link-Training Tunable PHY Repeater (LTTPR)?
• Why would you need a repeate...
PHY Repeaters
• A PHY repeater is a device containing only the PHY layer of data
receiver and data transmitter for cleanin...
WhyLTTPR?
GPU Docking
station
Distortion in
circuit board
Distortion in
connector
Distortion in
monitor cable
High speed D...
WhyLTTPR?
GPU Docking
station
Repeater with
signal equalizer
and retimer
To maintain signal integrity the best option
is t...
PHY Repeater Ensures Signal Integrity
• DisplayPort’s high 8.1 Gbps/lane bit rate requires an active cable
with PHY repeat...
LTTPR Features
• LTTPR contains DP RX and DP TX PHY and a signal retimer
• LTTPR contains means for tuning the PHY paramet...
LTTPR
PHY Layer (UFP)
Link-Training Tunable PHY Repeater
Main Link (4 lanes)
AUX Channel
HPD*
PHY Layer (DFP)
Link Layer L...
Two Operating Modes
Non-transparent Mode:
• Replies to AUX transactions to
LTTPR specific DPCD fields
• Passes through all...
LTTPRDPCDRegisters
00000h – 000FFh
00100h – 002FFh
…
F0000h – F000Fh
F0010h – F005Fh
F0060h – F00AFh
…
F0240h – F028Fh
PHY...
ExampleConfiguration
GPU Docking
station
• How does DP Source recognize
the LTTPRs?
• How is the Link Training performed?
...
LTTPR Recognition
• Phase 1 (HPD is propagated):
✓ HPD is asserted by DP Sink. All LTTPRs pass the signal.
• Phase 2 (Repe...
DP
Source Device
LTPPRX LTPPRX
DP
Sink Device
DP
Source Device
LTPPR2 LTPPR1
DP
Sink Device
DP
Source Device
LTPPR2 LTPPR1...
Link Training with LTTPRs
• DP Source performs full LT with each of the LTTPRs
✓ LT starts with repeater closest to DP Sou...
LTwithLTTPR
DP
Source Device
LTTPR2 LTTPR1
DP
Sink Device
DP
Source Device
LTTPR2 LTTPR1
DP
Sink Device
DP
Source Device
L...
Unigraf UCD-400 Tester Supports LTTPR
• UCD-400 Features
✓ Test DisplayPort 1.4 / HBR3 Sinks, Sources and Repeaters
✓ Capt...
UCDConsoleGUI
Reference Source
(Test Sink DUT)
Reference Sink
(Test Source DUT)
LTwithUCDConsole
In order to perform
Link Training with
LTTPRs click here
www.unigraf.fi
www.unigraf-china.cn
info@unigraf.fi
Thank You!
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Introduction to DisplayPort LTTPR

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Brief Introduction to Link-Training Tunable PHY Repeaters feature of DisplayPort™ interfaces.
- What is a Link-Training Tunable PHY Repeater (LTTPR)?
- Why would you need a repeater?
- LTTPR features
Examples:
- Recognizing LTTPRs
- Link training with LTTPRs.

Published in: Technology
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Introduction to DisplayPort LTTPR

  1. 1. Brief Introduction to DisplayPort™ Link-Training Tunable PHY Repeaters 2018-04-03
  2. 2. Link-Training Tunable PHY Repeaters • What is a Link-Training Tunable PHY Repeater (LTTPR)? • Why would you need a repeater? • LTTPR features • Example: ✓ Recognizing LTTPRs ✓ Link training with LTTPRs.
  3. 3. PHY Repeaters • A PHY repeater is a device containing only the PHY layer of data receiver and data transmitter for cleaning up signal waveform distortion caused by transmission across a cable, connector, or circuit board traces • A PHY repeater does not contain encryption layer • A PHY repeater that is capable of adjusting its output for Link Training is called Link-Training Tunable PHY Repeater
  4. 4. WhyLTTPR? GPU Docking station Distortion in circuit board Distortion in connector Distortion in monitor cable High speed DisplayPort signal is distorted in many locations between the GPU and the display Distortion in circuit board Distortion in connector Distortion in connector
  5. 5. WhyLTTPR? GPU Docking station Repeater with signal equalizer and retimer To maintain signal integrity the best option is to use PHY repeaters that equalize the signal via Link Training Repeater with signal equalizer and retimer
  6. 6. PHY Repeater Ensures Signal Integrity • DisplayPort’s high 8.1 Gbps/lane bit rate requires an active cable with PHY repeaters for cable lenghts exceeding 2 m . • A USB Type-C cable longer than 1 m must have PHY repeaters to provide full performance. ✓ Desktop computer connections typically require 2 m cables. • Docking stations or “mini-docks” of laptop computers and USB Type-C connected equipment also need PHY repeaters
  7. 7. LTTPR Features • LTTPR contains DP RX and DP TX PHY and a signal retimer • LTTPR contains means for tuning the PHY parameters during LT • LTTPR has up to four main Link Lanes and full Voltage Swing and Pre-emphasis combinations • Specific DPCD register range (F0000h – F028Fh) for LTTPR use • Up to 8 LTTPRs can be placed in the data path between DP Source, DP Sink or DP Repeater devices
  8. 8. LTTPR PHY Layer (UFP) Link-Training Tunable PHY Repeater Main Link (4 lanes) AUX Channel HPD* PHY Layer (DFP) Link Layer Link Layer Main Link (4 lanes) AUX Channel HPD* Signal Retimer *) LTTPR can either control or only snoop the HPD signal
  9. 9. Two Operating Modes Non-transparent Mode: • Replies to AUX transactions to LTTPR specific DPCD fields • Passes through all other transactions • Snoops transactions to DPCD 00100h – 002FFh and updates output as needed Transparent Mode: • Passes through all AUX transactions • Snoops transactions to DPCD 00100h – 002FFh and updates output as needed DP Source controls LTTPR operating modes
  10. 10. LTTPRDPCDRegisters 00000h – 000FFh 00100h – 002FFh … F0000h – F000Fh F0010h – F005Fh F0060h – F00AFh … F0240h – F028Fh PHY_Repeater1 Configuration and Status - Only LTTPR1 replies AUX transactions to these registers Link Configuration and Link/Sink Device Status - All LTTPRs shall snoop AUX transactions to these registers - LTTPRs in Transparent Mode shall update output as needed - LTTPR1 in Non-Transparent Mode shall update output as needed LT-tunable PHY Repeater DPCD Capability and ID Field - Shared by all LTTPRs between a DPTX and DPRX - All LTTPRs shall replay to AUX transactions to these registers PHY_Repeater2 Configuration and Status - Only LTTPR2 replies AUX transactions to these registers PHY_Repeater8 Configuration and Status - Only LTTPR8 replies AUX transactions to these registers
  11. 11. ExampleConfiguration GPU Docking station • How does DP Source recognize the LTTPRs? • How is the Link Training performed? DP Source Device DP Sink Device LTTPR2 LTTPR1
  12. 12. LTTPR Recognition • Phase 1 (HPD is propagated): ✓ HPD is asserted by DP Sink. All LTTPRs pass the signal. • Phase 2 (Repeater count and capabilities): ✓ DP Source reads DPCD F0000h to F0004h ✓ DP Sink replies with zero data ✓ LTTPR that receives zero count (LTTPR1) replaces it with its own data ✓ Each LTTPR update the data with their capabilities and increment the count • Phase 3 (DP Sink capabilities) ✓ DP Source reads DPCD 00000h to 00002h ✓ DP Sink replies with its capability data ✓ Each LTTPR pass the information
  13. 13. DP Source Device LTPPRX LTPPRX DP Sink Device DP Source Device LTPPR2 LTPPR1 DP Sink Device DP Source Device LTPPR2 LTPPR1 DP Sink Device LTTPRRecognition Sink attached Read sink capabilities Detect LTTPRs 1. 2. 3.
  14. 14. Link Training with LTTPRs • DP Source performs full LT with each of the LTTPRs ✓ LT starts with repeater closest to DP Source and ends with repeater closest to DP Sink • DP Source writes to LTTPR specific LT registers ✓ DP Sink and non-adressed LTTPRs reply AUX_NACK with M = 0 • DP Source reads LTTPR specific LT registers ✓ DP Sink and non-adressed LTTPRs reply AUX_ACK with zero or copy data • The LTTPR closest upstream snoops the data and sets its output accordingly • When all LTTPRs have been trained, DP Source LT with DP Sink
  15. 15. LTwithLTTPR DP Source Device LTTPR2 LTTPR1 DP Sink Device DP Source Device LTTPR2 LTTPR1 DP Sink Device DP Source Device LTTPR2 LTTPR1 DP Sink Device With LTTPR2 With LTTPR1 With DP Sink Link Training 1. 2. 3. Link Training Link Training *) Snoop data and update output for LT
  16. 16. Unigraf UCD-400 Tester Supports LTTPR • UCD-400 Features ✓ Test DisplayPort 1.4 / HBR3 Sinks, Sources and Repeaters ✓ Capture and Source up to 8K@30 & 4K@120 video and audio ✓ Verify HDCP 1.3 and HDCP 2.2 operation; Run HDCP 2.2 Compliance Test ✓ Monitor link status, set configuration parameters ✓ USB 3.0 connected • UCD Console GUI for debugging • High level TSI API for easy integration
  17. 17. UCDConsoleGUI Reference Source (Test Sink DUT) Reference Sink (Test Source DUT)
  18. 18. LTwithUCDConsole In order to perform Link Training with LTTPRs click here
  19. 19. www.unigraf.fi www.unigraf-china.cn info@unigraf.fi Thank You!

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