SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
Each DPI_n input port includes a 48-bit DPI_n_M_MDATA bus from DSS (DISPC) which carries attribute sideband signals associated with the DPI interface. The EDP sets the security status (DPISECURE) of the incoming DPI interface using the DPI_n_M_MDATA[10] bit as shown in Table 12-374.
Sideband bit(s) | Name | Description |
---|---|---|
DPI_n_M_MDATA[10] | DPISECURE | DPI-np secure bit 1: DPI-np is secure 0: DPI-np is not secure |
The EDP performs a simple security check on the selected DPI connection by comparing the value of the selected DPISECURE bit (per EDP_DPTX_SRC_CFG[7-4] VIF_n_SEL bits (where n = 0 to 3)) to the EDP_DPTX_VIF_SECURE_MODE_CFG[3-0] VIF_n bits.
If the selected DPISECURE bit is set to 1, the video content is considered to be secure and the connection (transmission via DPTX) is only made if the EDP_DPTX_VIF_SECURE_MODE_CFG[3-0] VIF_n bits are also set to 1 (indicating the display is also secure). Otherwise, the EDP forces the DSS_DPI_DATA to be 0h while leaving the sync signals alone – in effect, causing the video to go black. If the DPISECURE bit is set to 0, then the connection is also enabled.