NVIDIA VCQFX550PCIEPB User Guide - Page 148

Chapter 7 Configuring Key ForceWare Graphics Driver Features Table 7.2 Advanced Timing Parameters (continued) Advanced Timing Parameter Horizontal sync polarity Scan rate Active pixels Description Click the up or down arrow to specify the direction of rapid, transient change in the amplitude of a signal from the baseline during the horizontal synchronization pulse. If the horizontal synchronization polarity is positive (+), the value of the horizontal synchronization pulse is higher than the baseline value. If the horizontal synchronization polarity is negative (-), the value of the horizontal synchronization pulse is lower than the baseline value. Note: You can select the horizontal synchronization polarity independently of the vertical synchronization polarity. Scan rate indicates the measure of how many scan lines a monitor can display in one second, expressed in kHz (generally somewhere between 20 and 180 kHz). Note: In the case of an analog display (CRT) it is limited by the speed at which the display can move the electron beam horizontally across the screen and then return it to the beginning of the next line. Note: This value should not exceed the display's maximum horizontal scan frequency. Indicates the number of all visible pixels in one horizontal line. The Vertical lines group box contains vertical advanced timing settings. Sync width Front porch Back porch Vertical sync polarity Refresh rate Active pixels Click the up or down arrow to specify the blanking period during which the synchronization pulse is active. Click the up or down arrow to specify the vertical blanking period that occurs between the end of the active period and the beginning of the synchronization pulse. Click the up or down arrow to specify the blanking period that occurs between the end of the synchronization pulse and the next active period. Click the up or down arrow to specify the direction of rapid, transient change in the amplitude of a signal from a baseline during the vertical synchronization pulse. If the vertical synchronization polarity value is positive (+), the value of the vertical synchronization pulse is higher than the baseline value. If the vertical synchronization polarity value is negative (-), the value of the vertical synchronization pulse is lower than the baseline value. Note: You can select the vertical synchronization polarity independently of the horizontal synchronization polarity. Refresh rate refers to the frequency at which the entire screen is refreshed. Specifically, refresh rate indicates how many times per second the electron beam in the picture tube is moved from top to bottom in the case of a CRT (analog display). Note: This frequency is limited by the display's maximum horizontal scan rate and the current resolution, as higher resolution implies more scan lines. Note: The value should not exceed the display's maximum vertical scanning frequency. Specify the frequency at which your entire screen is refreshed, or retraced, to prevent the image from flickering. Indicates the number of all visible pixels in one vertical line. 148 User's Guide