SPRUJ28F November 2021 – August 2025 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
Figure 12-305 through Figure 12-308 show examples with timing diagrams of synchronization signals and pixel clocks for active matrix panels. The DISPC video ports directly drive these signals, which are related to the programmable fields listed in Table 12-328. For more information, see also Section 12.6.3.11.8, DISPC VP Timing Generator and Display Panel Settings.
| Name | Register | Description |
|---|---|---|
| PPL | DSS0_VP_SIZE_SCREEN[13-0] PPL value + 1 | Pixels per line |
| LPP | DSS0_VP_SIZE_SCREEN[29-16] LPP value + 1 | Lines per panel |
| HBP | DSS0_VP_TIMING_H[31-20] HBP value + 1 | Horizontal back porch |
| HFP | DSS0_VP_TIMING_H[19-8] HFP value + 1 | Horizontal front porch |
| HSW | DSS0_VP_TIMING_H[7-0] HSW value + 1 | Horizontal synchronization pulse width |
| VBP | DSS0_VP_TIMING_V[31-20] VBP value | Vertical back porch |
| VFP | DSS0_VP_TIMING_V[19-8] VFP value | Vertical front porch |
| VSW | DSS0_VP_TIMING_V[7-0] VSW value + 1 | Vertical synchronization pulse width |
| ALIGN | DSS0_VP_POL_FREQ[18] ALIGN | Alignment between HSYNC and VSYNC assertion |
| ONOFF | DSS0_VP_POL_FREQ[17] ONOFF | HSYNC and VSYNC pixel clock control |
| RF | DSS0_VP_POL_FREQ[16] RF | HSYNC and VSYNC pixel clock edge control |
| IEO | DSS0_VP_POL_FREQ[15] IEO | Invert output enable |
| IPC | DSS0_VP_POL_FREQ[14] IPC | Invert PCLK |
| IHS | DSS0_VP_POL_FREQ[13] IHS | Invert HSYNC |
| IVS | DSS0_VP_POL_FREQ[12] IVS | Invert VSYNC |
The HSYNC and VSYNC signals are driven on the opposite edge of PCLK from the pixel data.
The DE signal is active high.
The pixel data are driven on the rising edge of PCLK.
The HSYNC signal is active high.
The VSYNC signal is active high.
The VSYNC and HSYNC assertion is not aligned.
Figure 12-305 DISPC Display Timing Diagram of Configuration 1 (Start of Frame)
Figure 12-306 DISPC Display Timing Diagram of Configuration 1 (Between Lines)
Figure 12-307 DISPC Display Timing Diagram of Configuration 1 (Between Frames)
Figure 12-308 DISPC Display Timing Diagram of Configuration 1 (End of Frame)The HSYNC and VSYNC signals are driven on the rising edge of PCLK.
The DE signal is active low.
The pixel data is driven on the falling edge of PCLK.
The HSYNC signal is active low.
The VSYNC signal is active low.
The VSYNC and HSYNC assertion is not aligned.
Figure 12-309 DISPC Display Timing Diagram of Configuration 2 (Start of Frame)
Figure 12-310 DISPC Display Timing Diagram of Configuration 2 (Between Lines)
Figure 12-311 DISPC Display Timing Diagram of Configuration 2 (Between Frames)
Figure 12-312 DISPC Display Timing Diagram of Configuration 2 (End of Frame)The HSYNC and VSYNC signals are driven on the rising edge of PCLK.
The DE signal is active high.
The pixel data are driven on the rising edge of PCLK.
The HSYNC signal is active high.
The VSYNC signal is active high.
The VSYNC and HSYNC assertion is not aligned.
Figure 12-313 DISPC Display Timing Diagram of Configuration 3 (Start of Frame)
Figure 12-314 DISPC Display Timing Diagram of Configuration 3 (Between Lines)
Figure 12-315 DISPC Display Timing Diagram of Configuration 3 (Between Frames)
Figure 12-316 DISPC Display Timing Diagram of Configuration 3 (End of Frame)