4.1.5. Chainout Adder
You can use the output chaining path to add results from another DSP block. The output chainout port can be dynamically disable by asserting the DISABLE_CHAINOUT signal.
The chainout adder support all operational modes except for 18 x 18 or 18 x 19 independent multiplier mode.
When DISABLE_CHAINOUT port is used, the input register for this signal will be enabled. The register is driven by free running clock and there is no clock enable or clock clear signal to control this register.