Video Timing Parameters

The following waveforms show the video interface signals relationship.

Figure 1. Video Timing Waveform (Horizontal) - Example of Generic Frame Mode

Note: In Generic mode, there are no incoming byte packets for Line Start and Line End. Thus, a decoded hsync output is unable to carry any information about the origin HFP and HBP of a horizontal line. Instead, the hsync output follows the valid signal assertion and deassertion of a valid pixel data type (except for embedded 8-bit data type, which is non-image data; therefore, the hsync is not asserted according to the pixel data valid).

Figure 2. Video Timing Waveform (Vertical) - Example of Generic Frame Mode

Figure 3. Video Timing Waveform (Horizontal) – Example of Accurate Frame Mode

Note: Since there is no precise pixel interface timing information from the received packets (byte clk domain), the pixel interface signal may not be accurately represented by the waveform, e.g., the falling edge of hsync may be coming earlier or later than pixel data valid (shaded area), depending on the byte clk, pixel clk, and data type for byte2pixel conversion. If the falling edge of hsync is critical, you need to extend the original HFP period in TX.

Figure 4. Video Timing Waveform (Vertical) - Example of Accurate Frame Mode

Table 1. Video Timing Parameter Definitions
MIPI Video Timing Parameters	Definition	Min	Max	Unit
HACT	Total number of pixel per line	16	8,192	Pixel
VACT	Total number of line per frame	1	8,192	Line
HSA	HSYNC pulse width	1	4,096	Pixel
HBP	Horizontal back porch	1	4,096	Pixel
HFP	Horizontal front porch	1	4,096	Pixel
VSA	VSYNC pulse width	1	8,192	Line
VBP	Vertical back porch	1	8,192	Line
VFP	Vertical front porch	1	8,192	Line
Pixel Clock	Video stream pixel clock frequency in MHz	^¹	^¹	MHz
MIPI Speed	CSI-2 RX MIPI speed in Mbps	80	1,500	Mbps
No. data lane	Number of MIPI data lane	1	8	Lane

Table 1 describes the support range for video timing parameters. For a more precise check on timing compliance, you can refer to the Titanium MIPI Utility.

¹ Refer to Pixel Clock Calculation.