SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Using parallel output mode, the module on the display subsystem processing path is DISPC.
In synchronous parallel interface, the required data and control signals are provided directly to external MIPI DPI 2.0, or BT-656 or BT-1120 compatible parallel panels.
The DISPC is connected to the system memory through the device L3_MAIN interconnect and uses its own DMA engine (with embedded FIFO) to read data from the system memory. For more details, see Section 13.2.1, Display Controller.
All three DISPC LCD outputs are available for DSS DPI1 output, with selection done through the DSS_CTRL[17:16] PARALLEL_SEL bit field (multiplexer 13 in Figure 13-2). DSS DPI2 and DPI3 outputs are hardwired to DISPC LCD2 and LCD3 outputs.
Table 13-1 to Table 13-3 lists the outgoing display subsystem signals on the device boundary pads.
Signal Names at Device Pads (See Figure 13-2) | DSS_CTRL[17:16] PARALLEL_SEL = 1, 2, or 3 DISPC LCDx Channel Out (pixel data, clock, syncs) (where x = 1, 2, or 3) |
---|---|
vout1_fid | DISPC_LCDx_FID |
vout1_clk | DISPC_LCDx_PCLK |
vout1_de | DISPC_LCDx_DE |
vout1_vsync | DISPC_LCDx_VSYNC |
vout1_hsync | DISPC_LCDx_HSYNC |
vout1_d[23:0] | DISPC_LCDx_DATA[23:0] |
By default, DSS_CTRL[17:16] PARALLEL_SEL = 0x0, and DISPC TV data and HDMI clk/sync signals are output on DPI1 interface pins. Software must program the PARALLEL_SEL bit-field to value other than 0x0, in order DISPC LCD data and clk/sync signals to be output on DPI1 interface pins.
Signal Names at Device Pads (See Figure 13-2) | DISPC LCD2 Channel Out (pixel data, clock, syncs) |
---|---|
vout2_fid | DISPC_LCD2_FID |
vout2_clk | DISPC_LCD2_PCLK |
vout2_de | DISPC_LCD2_DE |
vout2_vsync | DISPC_LCD2_VSYNC |
vout2_hsync | DISPC_LCD2_HSYNC |
vout2_d[23:0] | DISPC_LCD2_DATA[23:0] |
Signal Names at Device Pads (See Figure 13-2) | DISPC LCD3 Channel Out (pixel data, clock, syncs) |
---|---|
vout3_fid | DISPC_LCD3_FID |
vout3_clk | DISPC_LCD3_PCLK |
vout3_de | DISPC_LCD3_DE |
vout3_vsync | DISPC_LCD3_VSYNC |
vout3_hsync | DISPC_LCD3_HSYNC |
vout3_d[23:0] | DISPC_LCD3_DATA[23:0] |
For more details on LCD output pixel data formats for the parallel interface, see Section 13.2 DISPC Environment, in Display Controller.