module ParameterArithmeticExample;

 // Simple parameter declarations
 parameter DATA_WIDTH = 8; // Data bus width
 parameter NUM_REGS = 16; // Number of registers in an array
 parameter CLOCK_FREQ_MHZ = 100; // Clock frequency in MHz

 // Parameters defined using arithmetic operations on other parameters and constants
 // Example 1: Subtracting a constant from a parameter
 parameter ADDR_WIDTH = $clog2(NUM_REGS); // Address width needed for NUM_REGS
 // $clog2 is a system function that returns
 // the ceiling of log base 2 

 // Example 2: Arithmetic involving multiple parameters and a constant
 parameter TOTAL_BUS_SIZE = DATA_WIDTH * 2; // Total size of two data buses

 // Example 3: Calculation of a related timing parameter
 parameter CLOCK_PERIOD_NS = 1000 / CLOCK_FREQ_MHZ; // Clock period in nanoseconds

 // Example 4: A mask derived from a width parameter
 parameter BYTE_SIZE = 8;
 parameter BYTE_MASK = BYTE_SIZE - 1; // Example directly from sources 

 // Example 5: Average calculation using other parameters
 parameter REAL_VAL_R = 5.7; // Declares 'r' as a real parameter 
 parameter INT_VAL_F = 9; // Declares 'f' as an integer parameter
 parameter AVERAGE_DELAY = (REAL_VAL_R + INT_VAL_F) / 2; // Uses addition and division 

 initial begin
 $display("--- Parameter Arithmetic Example ---");
 $display("DATA_WIDTH = %0d", DATA_WIDTH); // Expected: 8
 $display("NUM_REGS = %0d", NUM_REGS); // Expected: 16
 $display("CLOCK_FREQ_MHZ = %0d", CLOCK_FREQ_MHZ); // Expected: 100

 $display("ADDR_WIDTH = %0d", ADDR_WIDTH); // NUM_REGS=16, log2(16)=4. Expected: 4
 $display("TOTAL_BUS_SIZE = %0d", TOTAL_BUS_SIZE); // DATA_WIDTH*2 = 8*2 = 16. Expected: 16
 $display("CLOCK_PERIOD_NS = %0d", CLOCK_PERIOD_NS); // 1000/100 = 10. Expected: 10
 $display("BYTE_MASK = %0d", BYTE_MASK); // BYTE_SIZE-1 = 8-1 = 7. Expected: 7
 $display("AVERAGE_DELAY = %0f", AVERAGE_DELAY); // (5.7 + 9) / 2 = 14.7 / 2 = 7.35. Expected: 7.35
 end

endmodule