Here is a step-by-step approach to implementing the design of a multiplier using control and datapath:
1. Design the datapath
- Determine the bit widths of the inputs (A and B) and the output (P). For example, let's say both A and B are 8-bit numbers.
- Create registers to hold A, B and P.
- Create a full adder/subtractor component that can add or subtract based on a control signal.
- Connect the full adder/subtractors to create a multiplier array that can calculate the product P.
2. Design the control unit
- Create a state machine with states to control the multiplier operations.
- The states will control when to load inputs, start multiplication, shift partial products, add partial products, and output final result.
- Control signals will be generated to control the datapath components.
3. Connect the datapath and control
- Connect the control signals from the control unit to the datapath components.
- Load A and B into the input registers when load signals are asserted.
- Control the full adder/subtractors to multiply A and B by asserting add/subtract signals.
- Shift the partial products based on shift control signals.
- Load the final product P into output register when done.
4. Verify the design
- Create a testbench to apply sample inputs A and B.
- Simulate the design to check if the multiplier is calculating the product P correctly.
- Make any corrections to the datapath or control unit as needed.
5. Synthesize and implement the design
- Synthesize the RTL code to generate gate level netlist.
- Map to target technology library.
- Place and route to create layout.
- Generate bitstream to program FPGA or ASIC.
This covers the key steps in implementing a multiplier from design to bitstream generation by integrating the datapath and control components. Let me know if you need any clarification or have additional questions!