During normal operation, CSI-2 transmitter output bandwidth is reduced as it needs to transition between Low-Power and High-Speed modes. The minimum CSI-2 High-Speed data transmission overhead consists of T_LPX, T_HS-PREPARE, T_HS-ZERO, T_HS-SYNC, T_HS-TRAIL, and T_HS-EXIT as shown in Figure 6-6. The bandwidth is further reduced when operating in Discontinuous CSI-2 Clock mode as the CSI-2 clock requires additional overhead time to transition between Low-Power and Clock Transmission modes. The minimum CSI-2 Discontinuous Clock timing overhead consists of T_CLK-POST, T_CLK-TRAIL, T_CLK-PREPARE, T_CLK-ZERO, and T_CLK-PRE as shown in Figure 6-7. The typical CSI-2 timing overhead is given in Table 7-13.

For Best-Effort Round Robin, Basic Synchronized or Line-Interleaved CSI-2 Forwarding, the maximum CSI-2 bandwidth for each CSI-2 port is defined in Equation 2.

Equation 2.

For Line-Concatenated CSI-2 Forwarding, the maximum CSI-2 output bandwidth for each CSI-2 port is defined in Equation 3.

Equation 3.

where

• N_sensor is the number of sensors attached to the DS90UB662-Q1
• H_active is the horizontal line length of the active video frame in pixels
• N_bits/pxl is the number of bits per pixel
• N_{CSI_Lanes} is the number of CSI-2 Lanes
• f_CSI is the CSI-2 TX data rate per lane in Hz
• t_{CSI_Overhead} is the CSI-2 High-speed data and clock timing overhead as given in Table 7-13

NOTE: Calculations only hold if all 4 sensors have identical resolution and frame rate. Contact TI for bandwidth tools to calculate BW given a mix of inputs with different video parameters