DLPS206 May   2021 DLPC7540

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Power Electrical Characteristics
    6. 6.6  Pin Electrical Characteristics
    7. 6.7  DMD HSSI Electrical Characteristics
    8. 6.8  DMD Low-Speed LVDS Electrical Characteristics
    9. 6.9  V-by-One Interface Electrical Characteristics
    10. 6.10 FPD-Link LVDS Electrical Characteristics
    11. 6.11 USB Electrical Characteristics
    12. 6.12 System Oscillator Timing Requirements
    13. 6.13 Power Supply and Reset Timing Requirements
    14. 6.14 DMD HSSI Timing Requirements
    15. 6.15 DMD Low-Speed LVDS Timing Requirements
    16. 6.16 V-by-One Interface General Timing Requirements
    17. 6.17 FPD-Link Interface General Timing Requirements
    18. 6.18 Source Frame Timing Requirements
    19. 6.19 Synchronous Serial Port Interface Timing Requirements
    20. 6.20 Master and Slave I2C Interface Timing Requirements
    21. 6.21 Programmable Output Clock Timing Requirements
    22. 6.22 JTAG Boundary Scan Interface Timing Requirements (Debug Only)
    23. 6.23 JTAG ARM Multi-Ice Interface Timing Requirements (Debug Only)
    24. 6.24 Multi-Trace ETM Interface Timing Requirements
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Input Sources
      2. 7.3.2 Processing Delays
      3. 7.3.3 FPD-Link Interface
      4. 7.3.4 V-by-One interface
      5. 7.3.5 DMD (HSSI) Interface
      6. 7.3.6 Program Memory Flash Interface
      7. 7.3.7 GPIO Supported Functionality
      8. 7.3.8 Debug Support
    4. 7.4 Device Operational Modes
      1. 7.4.1 Standby Mode
      2. 7.4.2 Active Mode
        1. 7.4.2.1 Normal Configuration
        2. 7.4.2.2 Low Latency Configuration
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
  9. 9 Power Supply Recommendations
    1. 9.1 Power Supply Management
    2. 9.2 Hot Plug Usage
    3. 9.3 Power Supplies for Unused Input Source Interfaces
    4. 9.4 Power Supplies
      1. 9.4.1 1.15-V Power Supplies
      2. 9.4.2 1.21V Power Supply
      3. 9.4.3 1.8-V Power Supplies
      4. 9.4.4 3.3-V Power Supplies
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1  General Layout Guidelines
      2. 10.1.2  Power Supply Layout Guidelines
      3. 10.1.3  Layout Guidelines for Internal Controller PLL Power
      4. 10.1.4  Layout Guideline for DLPC7540 Reference Clock
        1. 10.1.4.1 Recommended Crystal Oscillator Configuration
      5. 10.1.5  V-by-One Interface Layout Considerations
      6. 10.1.6  FPD-Link Interface Layout Considerations
      7. 10.1.7  USB Interface Layout Considerations
      8. 10.1.8  DMD Interface Layout Considerations
      9. 10.1.9  General Handling Guidelines for Unused CMOS-Type Pins
      10. 10.1.10 Maximum Pin-to-Pin, PCB Interconnects Etch Lengths
    2. 10.2 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Device Nomenclature
        1. 11.1.2.1 Device Markings
        2. 11.1.2.2 Package Data
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
      1. 11.4.1 Video Timing Parameter Definitions
  12. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum

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10.1.8 DMD Interface Layout Considerations

The DLPC7540 controller HSSI differential interface waveform quality and timing is dependent on the total length of the interconnect system, the spacing between traces, the characteristic impedance, etch losses, and how well matched the lengths are across the interface. Thus, ensuring positive timing margin requires attention to many factors.

DLPC7540 I/O timing parameters as well as DMD I/O timing parameters can be found in their corresponding data sheets. Similarly, PCB routing mismatch can be budgeted and met through controlled PCB routing. PCB design recommendations are provided in Table 10-8 , Figure 10-16,and the paragraph below as a starting point for the customer.

Table 10-8 PCB Recommendations for DMD Interface (1)(2)
PARAMETERMINMAXUNIT
TWTrace Width5.7mils
TSIntra-lane Trace Spacing5.3mils
TSPPInter-lane trace spacing (3)48.3mils
(1) Recommendations to achieve the desired nominal differential impedance as specified by RDIFF in Section 6.7.
(2) These parameters show recommendations based on the micro-strip design shown in Figure 10-16. This design minimizes signal loss to support longer trace lengths at the expense of electromagnetic interference (EMI). The designer has the option to use of a stripline design for shorter trace lengths and to target minimizing EMI at the expense of signal loss.
(3) A reduced inter-lane spacing can be used to escape the Controller ball field, however, widen this spacing to at least the stated minimum after escape.
GUID-36A733B6-264F-40D2-AA21-E69377249127-low.gifFigure 10-16 DMD Differential Layout Recommendations

Additional DMD interface layout guidelines:

  • Route the differential signal pairs on the top layer of the PBC to minimize the number of vias. Limit the number of necessary vias to two. If two are required, place one at each end of the line (one at the controller and one at the DMD).
  • Route the differential signal pairs over a single ground or power plane using a Micro-strip line configuration.
  • Do not route the differential signal pairs over the slit of power or ground planes.
  • Ensure the bend angles associated with the differential signal pairs are between 135o and 225o.
  • Route the single-ended signal in a way that to minimizes the number of vias required. Limit the number of necessary vias to two. If two are required, place one at each end of the line (one at the controller and one at the DMD).
  • Avoid stubs.
  • No external termination resistors are required on the DMD_HSSI or DMD_LS differential signals.
  • Include a series termination resistor (with a value of 30.1 Ω, for example) to the DMD_LS0_RDATA and DMD_LS1_RDATA single-ended signal paths. Place the resistor as close as possible to the corresponding DMD pin.
  • The DMD_DEN_ARSTZ does not typically require a series resistor, however, for a long trace, one might be needed to reduce undershoot or overshoot.