The MAX9276 does not have a CDS pin. Here's why it's not needed.
The CDS pin is used to determine which device (serializer or deserializer) has a uC attached, when using the UART format for the control channel. If a uC is attached to both the serializer and deserializer, then it should be set accordingly in the 2 devices. Some devices, such as the MAX9276, do not have a CDS pin. These devices automatically adapt depending on the direction of the command and therefore do not need a CDS pin. To operate correctly it is only necessary to make sure the device is programmed for UART format (Reg 0x04[3:2) = 0b01), which is the default.
This information is only applicable when UART format is used. When I2C format is used in both serializer and deserializer, all devices automatically adapt, depending on the direction of the I2C command.