SNLU254A November   2020  – July 2022 DS160PT801

 

  1.   Abstract
  2.   Trademarks
  3. 1EVM Control and Configuration Information
    1. 1.1 Retimer Pin Controls
    2. 1.2 USB-to-SMBus Interface
    3. 1.3 PCIe PRSNT# Signal Control and Configuration
    4. 1.4 PCIe Reference Clock Control and Configuration
  4. 2EVM Power
    1. 2.1 EVM Current Sensing
  5. 3SigCon Architect GUI
    1. 3.1 Setup and Installation
    2. 3.2 Configuration Page
    3. 3.3 Low-Level Page
    4. 3.4 EEPROM Page
    5. 3.5 Control Panel
    6. 3.6 High-Level Page
    7. 3.7 Diagnostic Page
    8. 3.8 Eye Monitor Page
  6. 4PCB Material Information
    1. 4.1 DS160PT801 PCB Design
    2. 4.2 DS160PT801 PCB Stackup
    3. 4.3 DS160PT801 PCB Power Distribution
    4. 4.4 DS160PT801 Local Decoupling
  7. 5DS160PT801X16EVM Schematic
  8. 6Hardware BOM
  9. 7Revision History

1.3 PCIe PRSNT# Signal Control and Configuration

The riser card allows users to alter the hot-plug presence detect signal (PRSNT#) returned to the PCIe host sytem. This is done by using the headers shown in Figure 1-3. By modifying the jumpers it is possible to have the PRSNT# signal represent a x1, x4, x8, or x16 mechanical link width. When using the default jumper configuration listed in Table 1-1, the DS160PT801 riser card allows the PRSNT# lines to be dynamically determined by the connected endpoint, which is useful for hot-plug detection.


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Figure 1-3 DS160PT801X16EVM PCIe PRSNT# Controls

Removing the four shunt jumpers on J45–J48 and placing a single shunt across the lower two pins in one of the connectors allows the riser card to override PRSNT#. This is useful if a certain width is desirable. For example, by inserting a shunt jumper in position 2-3 on header J45 will force the PRSNT# status to represent a 1x4 mechanical link width.