SLLSEO9D March   2016  – October 2024 SN65DPHY440SS , SN75DPHY440SS

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics, Power Supply
    6. 5.6 Electrical Characteristics
    7. 5.7 Timing Requirements
    8. 5.8 Switching Characteristics
    9. 5.9 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 HS Receive Equalization
      2. 6.3.2 HS TX Edge Rate Control
      3. 6.3.3 TX Voltage Swing and Pre-Emphasis Control
      4. 6.3.4 Dynamic De-skew
    4. 6.4 Device Functional Modes
      1. 6.4.1 Shutdown Mode
      2. 6.4.2 LP Mode
      3. 6.4.3 ULPS Mode
      4. 6.4.4 HS Mode
    5. 6.5 Register Maps
      1. 6.5.1  BIT Access Tag Conventions
      2. 6.5.2  Standard CSR Registers (address = 0x000 - 0x07)
      3. 6.5.3  Standard CSR Register (address = 0x08)
      4. 6.5.4  Standard CSR Register (address = 0x09)
      5. 6.5.5  Standard CSR Register (address = 0x0A)
      6. 6.5.6  Standard CSR Register (address = 0x0B)
      7. 6.5.7  Standard CSR Register (address = 0x0D)
      8. 6.5.8  Standard CSR Register (address = 0x0E)
      9. 6.5.9  Standard CSR Register (address = 0x10) [reset = 0xFF]
      10. 6.5.10 Standard CSR Register (address = 0x11) [reset = 0xFF]
  8. 7 Application and Implementation
    1. 7.1 Application Information,
    2. 7.2 Typical Application, CSI-2 Implementations
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Reset Implementation
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.3.3 TX Voltage Swing and Pre-Emphasis Control

In some applications, the DPHY440 may be placed at a location in the system where the channel from DPHY440 DB[3:0]P/N interface to the DPHY Sink (CSI-2 or DSI) is extremely long and the DPHY Sink does not have enough receive equalization to compensate for the ISI loss. In this application, the system architect may want to use the DPHY440 TX pre-emphasis feature to compensate for the lack of equalization at the DPHY sink. The DPHY440 provides two levels of pre-emphasis: 0 dB, and 2.5 dB. The TX pre-emphasis settings is determined through the sampled sate of PRE_CFG[1:0] pins at the rising edge of RSTN. If necessary, the TX pre-emphasis settings can be adjusted by writing to the HSTX_PRE register through the local I2C interface.

This feature must only be used when the HS pre-emphasis bit (transition bit) is attenuated by the channel. Enabling pre-emphasis in a system that has little channel loss (transition bit is not attenuated) may result in negative impact to system performance.

Table 6-3 HS Voltage Swing, HS Pre-Emphasis, LPTX Edge Rate Controls
VSADJ_CFG0PRE_CFG1HS TX VODHS TX PRE-EMPHASISDB[3:0] LP TX RISE/FALL TIME
≤ VIL≤ VIL200 mV0 dB18 ns
VIM≤ VIL200 mV0 dB27 ns
≥ VIH≤ VIL220 mV0 dB18 ns
≤ VILVIM200 mV0 dB27 ns
VIMVIM200 mV0 dB21 ns
≥ VIHVIM220 mV0 dB21 ns
≤ VIL≥ VIH220 mV2.5 dB27 ns
VIM≥ VIH200 mV2.5 dB21 ns
≥ VIH≥ VIH220 mV2.5 dB21 ns