5 High Level Page

The DS320PR410 redriver features a continuous-time linear equalizer (CTLE) that applies high-frequency boost and low-frequency attenuation to help equalize the frequency-dependent insertion loss effects of a passive channel. CTLE settings are referred to as EQ settings in this section for clarity and brevity.

The High Level Page is used to quickly and easily adjust the EQ settings as needed for your specific application. A further description of the EQ settings can be found in the DS320PR410 Four-Channel Linear Redriver for PCIe™ 5.0, CXL 2.0, data sheet. The page contains a Device Status tab to monitor each connected device's channel status and a Block Diagram tab to adjust the EQ settings of each connected device. The following steps walk through the features of the detailed features of the High Level Page.

1. After clicking on the High Level Page tab on the left side of the GUI, the Device Status tab is shown, such as in Figure 5-1. Each channel status is updated sequentially, showing each connected device's channel RX Detect and EEPROM Bank Load status, along with the channel's current EQ settings. The RX Detect status bar appears green if proper receiver impedance detection is found and red if proper receiver impedance detection is not found. EEPROM Load status bars appear green if the device's register bank has properly loaded EEPROM data and red if EEPROM data has failed to load. Note that the EEPROM Load status always indicates a failed (red) load status when the device is operating in SMBus/I²C secondary mode (MODE = L2). The current EQ settings are shown to the right of each channel's status indicators.
   
   

   

   
   Figure 5-1 High Level Page: Device Status Tab
2. Click the Block Diagram tab to show the screen highlighted in Figure 5-2. Here, the EQ settings (EQ Index, EQ Boosts, EQ DC Gain) for each channel can be adjusted. To program the settings for a specific device or channel, select a device and channel from the respective Device Select and Channel Select drop-down menus.
   
   

   

   
   Figure 5-2 High Level Page: Block Diagram Tab, Device and Channel Select
3. Select the desired EQ Index / EQ Boost settings and EQ DC Gain. The EQ Index drop-down menu is the easiest way to quickly adjust the amount of redriver equalization boost applied. After selecting an EQ Index value, the EQ Boost 1, EQ Boost 2, and EQ Boost 1 (2nd order) fields are automatically populated. The user can adjust each boost value for finer tuning as needed. Refer to the device data sheet for more information regarding EQ Index boost values. These options are highlighted in Figure 5-3.
   
   

   

   
   Figure 5-3 High Level Page: EQ Index and EQ Boost Select

   The EQ DC Gain drop-down menu highlighted in Figure 5-4 can be used to adjust channel DC Gain (Flat Gain). Further information regarding DC Gain can be found in the device data sheet. The EQ DC Gain value of 0dB is recommended for most applications.

   
   

   

   
   Figure 5-4 High Level Page: EQ DC Gain Select

   Click the Apply to Channel button to apply the selected EQ settings to the selected Device and selected Channel (indicated by the Device Select and Channel Select drop-down menus, respectively). Click the Apply to All Channel button to apply selected EQ settings to all channels of the device or devices selected using the Device Select drop-down menu. These options are highlighted in Figure 5-5.

   
   

   

   
   Figure 5-5 High Level Page: Apply to Channel and Apply to All Channels