The Bidirectional Control Channel (BCC) supports higher frequency operation when attached to the TSER953 and is also compatible with DVP Mode serializers. The Bidirectional Control Channel is compatible with I2C devices, allowing local I2C target access to device registers as well as bidirectional I2C operation across the link to the Serializer and attached devices. I2C access should not be attempted across the link when Rx Port Lock status is Low. In addition to providing BCC operation, the back channel signaling also supports GPIO operations and advertising device capabilities to the attached Serializer device. The default back channel frequency is selected by the strap setting of the MODE pin. Additional speeds are also available, controlled separately for each Rx Port through the BC_FREQ_SELECT register field in the BCC_CONFIG register 0x58. Back channel frequency operates in 50-Mbps and 2.5-Mbps modes to support TSER953 and DVP Mode Serializers.