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VIP for DisplayPort 2.0

Overview

The Cadence® Verification IP (VIP) for DisplayPort is the industry's most comprehensive protocol validation solution for DisplayPort designs. It provides a complete bus functional model (BFM) and protocol monitor with integrated automatic protocol checks.  Incorporating the latest protocol updates, the DisplayPort VIP is designed for easy integration in testbenches at IP, SoC, and system levels, the VIP helps engineers reduce time to first test, accelerate verification closure, and ensure end-product quality.

The VIP for DisplayPort can be used as standalone, as a platform for running TripleCheck tests, and/or enabling DSC VIP on top of the base VIP. The VIP for DisplayPort is compatible with all main verification languages such as Verilog, SystemVerilog, e, VHDL, C, SystemC®, and Vera, methodologies such as UVM, OVM, and VMM, and runs on all leading simulators.

Supported specifications:

The VIP is compliant with the following VESA specifications: DisplayPort versions 1.2a, 1.3, 1.4, 1.4a, 2.0, and 2.1 and Embedded DisplayPort (eDP) versions 1.3, 1.4a, 1.4b, and 1.5. 

 

Product Highlights 

  • Testbench language interfaces for SystemVerilog, UVM, OVM, e, and SystemC 
  • Powerful error injection capability with predefined errors or through callbacks
  • Enables bypass of training mode to link devices
  • Interface choice: Serial and Parallel (10-bit, 18-bit, 20-bit, and 40-bit for main link)
  • Generates constrained-random bus traffic over all channels: Main Link, AUX and HPD
  • Display Stream Compression (DSC) support 
  • Provides extensive coverage in e and SystemVerilog

 

Key Features

The following table shows key features from the spec that are implemented in the VIP:

 

 

Feature Name
Description
Device Support Source, Sink, Link Training-Tunable PHY Repeater (LTTPR/retimer)
Main Link Interface

Serial, Parallel (10-bit, 20-bit, 40-bit)

Link Rate

RBR (1.62Gbps), HBR (2.7Gbps), HBR2 (5.4Gbps), R216 (2.16Gbps), R243 (2.43Gbps), R324 (3.24Gbps), R432 (4.32Gbps), UHBR10 (10Gbps), UHBR13.5: (13.5Gbps), UHBR20 (20Gbps)

Link width Configurable link width support: x1, x2, and x4 lane
AUX

Native AUX, I2C over AUX, AUX Manchester-II encoding, AUX jitter generation and detection

HDCP
  • Protocol Versions: 1.3, 2,2, 2,3
  • Authentication protocol
  • Cipher and data encryption/decryption 
  • Link integrity check in SST and MST 
  • Encryption status signaling
  • Allow AUX_DEFER as a valid response

DPCD Provides support for DisplayPort Configuration Data
HPD

Plug, Unplug and IRQ pulse

Isochronous Transport Services

Single-Stream Transport (SST) and Multi-Stream Transport (MST) modes

Video Formats/Modes
  • All bit depth via pixel arrays
  • Color formats: YCbCr 4:2:0, RAW bpp 6/7/8/10/12/14/16, Adaptive-Sync and ignore MSA, MISC 1-bit 6 support
  • Interlaced video mode
Audio

LPCM non-HBR, LPCM HBR, 3D LPCM, 1-bit, DST, INFOFRAME SDP, Audio_TimeStamp SDP

Link training
  • Adjustable swing levels
  • Adjustable pre-emphasis levels
  • Link retraining
  • Fast training without AUX handshakes
Main Link Modeling

Physical Layer

  • (De)serialization (8b/10b, 128b/132b)
  • Scrambling/descrambling
  • (De)serialization (8b/10b, 128b/132b)
  • (De)skewing
  • Error Correcting Code (ECC)
  • Forward Error Correcting (FEC)
  • 16-bit CRC for each color component

Link Layer (Frames, Lines, Idles)

  • Color (un)packing
  • (Un)stuffing
  • (Un)framing (basic and enhanced)
Forward Error Correction (FEC)

With SST/MST and with or without HDCP: 

  • Reed-Solomon (RS) 254, 250
  • Two-way interleaving and de-interleaving (CD_ADJ, FEC_PM)
Spread Spectrum Clocking (SSC)

DP 1.4, DP2.0

Link Quality Patterns
  • Nyquist
  • Symbol Error Rate
  • PRBS7
  • HBR2 EYE patterns
  • Custom 80-bit
  • Custom 264-bit
  • Mixed patterns on different lanes
Power Management
  • Enables Sink power state machine and power-save mode
  • Advanced Link Power Management (ALPM) to reduce wake-up latency
Global Time Code Enabled synchronization between DP devices across a DP link to a 100ns precision
Panel Self Refresh (PSR)

PSR, PSR2

DisplayPort 2.1
Link Training Concurrent Link Training
DisplayPort 2.0
Encoding 128b/132b channel encoding
Serialization/De-serialization Update Serialization/De-serialization of 128b/132b encoding
Scrambling Scrambling/De-scrambling for new 128b/132b encoding
Multi-stream Transport (MST) Mode Updates
  • MST used for transporting multiple main video streams each enclosed in a VC payload
  • Up to 63 independent audio video streams
  • SDP splitting by default
Link Rate Updates

New link rates: UHBR10 (10Gbps/lane), UHBR13.5 (13.5Gbps/lane), UHBR20 (20Gbps/lane)

PHY Logical Updates
  • Link Layer to PHY logical main link lane count conversion
  • Intra super symbol shifting/reverse shifting
Link Layer and Link Training Updates
  • 128b/132b TPS's and sequence
  • SDP parity nibbles zero-padding (deprecate nibble interleaving)
  • VFREQ and AFREQ replacement
Panel Replay Mode Optional feature defined as a subset of Panel Self Refresh 2 mode to reduce system level power and increase flexibility of adaptive sync solution.
Data Stream Compression (DSC) Updates

DSC support mandate for 128b/132b Link Layer-capable DP devices

DSC bitstream pass-through across DP branch device (retimer)

DSC bitstream mapping to 32-bit link symbol

Control Data Indicator (CDI)

CDI insertion

Combine 4-bit CDI + four 32-bit symbols to 132-bit symbols

Precoding  
Skew

TX skew (up to 32-bit between lanes)

RX deskew

Forward Error Correction (FEC) Updates

Two-way interleaving and de-interleaving, RS FEC enablement

Link Layer Lane Count 4
Physical Lane Count 4, 2, 1
Micro-Packet

Multi-stream transport packet (MTP)

64 link symbol cycles per Link Layer Lane

Condensed micro-packet header in Link Layer Control Packet (LLCP)

Link Layer Frame Boundary Update

Link Layer Control Packet (LLCP) for 128b/132b encoding

Link Quality Pattern Updates

Nyquist pattern, Square pattern, SymbolErr (128b/132b TPS2), 264b custom, Mixed patterns on different lanes

Fallback Fallback from DP 2.0 to DP 1.4
DisplayPort 1.3 1.4,1.4a 
Video Format Update

YCbCr 4:2:0, RAW bpp 6/7/8/10/12/14/16, Adaptive-Sync and ignore MSA, MISC 1-bit 6 support

SDP Format Update
  • Camera SDP
  • VSC SDP extension for Pixel Encoding and Colorimetry Format
  • Video Stream Configuration Extension VESA (VSC_EXT_VESA) chain-able SDP type
  • Video Stream Configuration Extension CEA (VSC_EXT_CEA) chain-able SDP type
  • CEA InfoFrame SDP packing format Ver.1.3
  • Picture Parameter Set SDP
  • SDP Splitting in SST and MST mode
Audio Format Update Native support for 3D LPCM, One Bit, and DST types
Forward Error Correction (FEC)

Support for following with SST/MST and with/without HDCP

  • Reed-Solomon code FEC function RS (254, 250)
  • Two-way interleaving, CD_ADJ, FEC_PM
FEC SCRs
  • FEC decode enable sequence re-enable 1,000LL
  • FEC enable sequence first enable 1,000LL after LT
  • FEC decode sequence insertion at the end of FEC block
  • PM symbol not to advance the HDCP cipher
  • FEC running disparity change
Link Training Update (+SCRs)
  • HBR3 - 8.1Gbps/lane speed
  • TPS4 pattern
  • Post-Link training request sequence and fallback support
  • Total of 10 AUX_ACKs for read request
  • Symbol lock failures in two- and four-lane configurations
  • Reduced lane fallback during CR
  • Last partial TPS2/TPS3/TP4 training patterns
Link Quality Measurement Pattern Update

CP2520 (HBR2 Compliance EYE pattern) SR-CP-CP-SR-248 00h's, SR-BF-BF-SR-248 00h's, SR-BS-BS-SR-248 00h's

Link Training-Tunable PHY Repeater Source and Sink model support LTTPR
eDP 1.5
Content Protection TPS4 with Alternative Scrambler Seed Reset (ASSR)
ALPM Update Removed ALPM requirement for DSC and eDP devices
HDR Support Update New SDP packets to support HDR (VCS Extension VESA SDP and VCS Extension CEA SDP)
SDP Format Update SDP splitting for SST mode

eDP 1.4a and eDP 1.4b

ALPM Update
  • ALPM as requirement for PSR2 operation and that the ALPM Enable bit must be set for PSR2 operation
  • PM_State 2a optional for Sink devices
  • Transmitter requirements with regard to starting ML_PHY_LOCK signal (except IDLE pattern)
  • Fast wake timing and entry for Main-Link lock setup time tML_PHY_LOCKsu
  • Last partial ML_PHY_LOCK pattern
PSR State Update

Support PSR states transition, Y-coordinate, control bit setting, update X and Y coordinate increment granularity limits, redefined synchronization latency in Sink device

AUX Frame Sync Update

Support of redefined AUX frame synch

eDP 1.3

Backlight Control Enables Backlight and Display control registers
Display Authentication Supports Alternative Scrambler Seed Reset (ASSR)

Fast Training

Supports fast training without AUX handshakes
PSR / PSR2 Provides the ability for Panel Self Refresh (PSR)

eDP 1.4

ALPM Supports Advanced Link Power Management (ALPM) to reduce wakeup latency

Link Rate

Supports new standard link rates: R216 (2.16Gbps), R243 (2.43Gbps), R324 (3.24Gbps), and R432 (4.32Gbps) for system optimization
Aux Frame Sync

AUX-based Source-to-Sink Device Active Video Timing Synchronization (Initial release)

 

Simulation Testsuite 

Extensive testsuite, coverage model and verification plan with clear linkage to the specification for simple and fast compliance testing 

Testsuite Link: TripleCheck Test Suite

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