SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Figure 13-28 through Figure 13-31 show timing diagrams of synchronization signals and pixel clocks for active matrix panels. The DISPC directly drives these signals, which are related to the programmable fields listed in Table 13-56.
| Name | Register | Description |
|---|---|---|
| PPL | DISPC_SIZE_LCDo[11:0] PPL value + 1 | Pixels per line |
| LPP | DISPC_SIZE_LCDo[27:16] LPP value + 1 | Lines per panel |
| HBP | DISPC_TIMING_Ho[31:20] HBP value + 1 | Horizontal back porch |
| HFP | DISPC_TIMING_Ho[19:8] HFP value + 1 | Horizontal front porch |
| HSW | DISPC_TIMING_Ho[7:0] HSW value + 1 | Horizontal synchronization pulse width |
| VBP | DISPC_TIMING_Vo[31:20] VBP value | Vertical back porch |
| VFP | DISPC_TIMING_Vo[19:8] VFP value | Vertical front porch |
| VSW | DISPC_TIMING_Vo[7:0] VSW value + 1 | Vertical synchronization pulse width |
| ONOFF(1) | DISPC_POL_FREQo[17] ONOFF | DISPC_HSYNC and DISPC_VSYNC pixel clock control |
| RF(2) | DISPC_POL_FREQo[16] RF | DISPC_HSYNC and DISPC_VSYNC pixel clock edge control |
| IEO | DISPC_POL_FREQo[15] IEO | Invert DISPC_ACBIAS |
| IPC(3) | DISPC_POL_FREQo[14] IPC | Invert DISPC_PCLK |
| IHS | DISPC_POL_FREQo[13] IHS | Invert DISPC_HSYNC |
| IVS | DISPC_POL_FREQo[12] IVS | Invert DISPC_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.
Figure 13-28 DISPC Active Matrix Timing Diagram of Configuration 1 (Start of Frame)
Figure 13-29 DISPC Active Matrix Timing Diagram of Configuration 1 (Between Lines)
Figure 13-30 DISPC Active Matrix Timing Diagram of Configuration 1 (Between Frames)
Figure 13-31 DISPC Active Matrix 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.
Figure 13-32 DISPC Active Matrix Timing Diagram of Configuration 2 (Start of Frame)
Figure 13-33 DISPC Active Matrix Timing Diagram of Configuration 2 (Between Lines)
Figure 13-34 DISPC Active Matrix Timing Diagram of Configuration 2 (Between Frames)
Figure 13-35 DISPC Active Matrix 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.
Figure 13-36 DISPC Active Matrix Timing Diagram of Configuration 3 (Start of Frame)
Figure 13-37 DISPC Active Matrix Timing Diagram of Configuration 3 (Between Lines)
Figure 13-38 DISPC Active Matrix Timing Diagram of Configuration 3 (Between Frames)
Figure 13-39 DISPC Active Matrix Timing Diagram of Configuration 3 (End of Frame)