When initializing the communications link between the TDES954 deserializer hub and a TSER953 serializer, the system timing will depend on the mode selected for generating the serializer reference clock. When synchronous clocking mode is selected, the serializer will re-lock onto the extracted back channel reference clock once available so there is no need for local crystal oscillator at the sensor module (Figure 9-3). When the TSER953 is operating in non-synchronous mode, or if connecting to a DVP Mode serializer, the sensor module requires a local reference clock and timing would follow Figure 9-4.

Figure 9-3 Power-Up Sequencing Synchronous Back Channel Clocking Mode, VDD_SEL = LOW

Figure 9-4 Power-Up Sequencing Non-synchronous Back Channel Clocking Mode, VDD_SEL = LOW