Payload Bandwidth Management - 3.1 English

The following steps manage payload bandwidth in the source controller:

1. Calculate Target_Average_StreamSymbolTimeSlotsPerMTP based on the VESA DisplayPort Standard v1.4. Program the VC payload size with the calculated Target_Average_StreamSymbolTimeSlotsPerMTP and align it with nearest even boundary

   For example if the value is 13, program the VC payload size for this particular stream to 14

   .
2. The VC payload calculation for (1920x2200) stream, RGB color sampling, 8 Bits Per Color at 5.4 Gbps, 4 lanes is shown here:

   VC Payload Band width = LINK_RATE × Lane_count × 100 (Table 2-136 in the DisplayPort standard) = 5.4 × 4 × 100 = 2160

   Average Stream symbol Time slot per MTP = (Pixel_rate × Bits_per_pixel/8/VC Payload_Band width) × 64 (Section 2.6.4.3.1 in the DisplayPort standard) = (297 MHz × 24 /8/2160) × 64 = 26.4

   VC Payload Size = 2/4 symbol aligned of (Average Stream symbol Time slot per MTP) = 28

3. Program the VC Payload table as defined in DPCD standard.
4. Program the VC Payload table in source controller as defined in registers 12’h0x800 –12’h0x8FC.