SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The power, reset, and clock management (PRCM) module provides clock signals to the display subsystem.
Figure 13-4 shows the details of the display subsystem clock tree.
Table 13-6 lists the main DSS clocks and their sources.
Clocks | ||||
Module Instance | Destination Signal Name | Source Signal Name | Source | Description |
DSS | DPLL_VIDEO1 input | VIDEO1_DPLL_CLK | PRCM module | Functional clock |
DPLL_VIDEO2 input | VIDEO2_DPLL_CLK | PRCM module | Functional clock | |
DPLL_HDMI input | HDMI_DPLL_CLK | PRCM module | Functional clock | |
DSS_L3_ICLK | DSS_L3_GICLK | PRCM module | Interface clock | |
DSS_L4_ICLK | DSS_L3_GICLK | PRCM module | Interface clock | |
- | ABE_GICLK | PRCM, DPLL_ABE | Functional clock | |
DSS_CLK | DSS_GFCLK | PRCM module | Main display subsystem functional clock | |
HDMI_CEC_GFCLK | DSS_HDMI_CEC_CLK | PRCM module | HDMI core CEC engine clock | |
HDMI_PHY_GFCLK | DSS_HDMI_PHY_CLK | PRCM module | HDMI_PHY clock |
Destination | Source Signal Name | Source | Multiplexer Number in Figure 13-4 | DSS_CTRL Register Bit-field |
---|---|---|---|---|
DISPC functional clock (F_CLK) | DSS_CLK | PRCM | 1 | [9:7] F_CLK_SWITCH |
DPLL_DSI1_A_CLK1 | DPLL_VIDEO1, DPLL_HDMI, External clocks | |||
DPLL_DSI1_B_CLK1 | DPLL_VIDEO1, DPLL_HDMI, DPLL_ABE, External clocks | |||
DPLL_DSI1_C_CLK1 | DPLL_VIDEO1, DPLL_HDMI, External clocks | |||
DPLL_HDMI_CLK1 | DPLL_HDMI | |||
DISPC LCD1 functional clock (LCD1_CLK) | DSS_CLK | PRCM | 2 | [0] LCD1_CLK_SWITCH |
DPLL_DSI1_A_CLK1 | DPLL_VIDEO1, DPLL_HDMI, External clocks | |||
DISPC LCD2 functional clock (LCD2_CLK) | DSS_CLK | PRCM | 3 | [12] LCD2_CLK_SWITCH |
DPLL_DSI1_B_CLK1 | DPLL_VIDEO1, DPLL_HDMI, DPLL_ABE, External clocks | |||
DISPC LCD3 functional clock (LCD3_CLK) | DSS_CLK | PRCM | 10 | [19] LCD3_CLK_SWITCH |
DPLL_DSI1_C_CLK1 | DPLL_VIDEO1, DPLL_HDMI, External clocks | |||
DISPC TV functional clock | DPLL_HDMI_CLK1 | DPLL_HDMI | N/A | N/A |
DISPC TV pixel clock (TV_CLK) | DSS_HDMI_PCLK | HDMI | N/A | N/A |
DISPC internal functional clock (DISPC_CLK after divider of F_CLK) | F_CLK | DSS | N/A | N/A |
DPI1 functional/pixel clock | DSS_DISPC_LCD1_PCLK | DISPC | 13 | [17:16] PARALLEL_SEL |
DSS_DISPC_LCD2_PCLK | DISPC | |||
DSS_DISPC_LCD3_PCLK | DISPC | |||
DSS_HDMI_PCLK | HDMI | |||
DPI2 functional/pixel clock | DSS_DISPC_LCD2_PCLK | DISPC | N/A | N/A |
DPI3 functional/pixel clock | DSS_DISPC_LCD3_PCLK | DISPC | N/A | N/A |
HDMI timing clock (DSS_HDMI_TCLK) | N/A | HDMI_PHY | N/A | N/A |