Define the CPU Architecture:

$$ Choose an $19-$bit architecture $($ Instruction size will be $19-$bit $).$

$$ Define a specialized instruction set tailored to a specific application or set of applications $($e$.$g$.,$ signal processing, cryptography$).$

$$ Create a detailed architectural specification, including pipeline stages, register file, ALU, and memory interfaces.

You can use Verilog$/$VHDL$/$systemverilog and yes, publish on your own github $($keep it public$).$ You can add some extra instructions as well, based on your convenience.

Arithmetic Instructions

$1.$ n registers r$2$ and r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2+$ r$3$

$2.$ SUB r$1,$ r$2,$ r$3$

$$ Description: Subtract the value in register r$3$ from the value in register r$2,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2-$ r$3$

$3.$ MUL r$1,$ r$2,$ r$3$

$$ Description: Multiply the values in registers r$2$ and r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2*$ r$3$

$4.$ DIV r$1,$ r$2,$ r$3$

$$ Description: Divide the value in register r$2$ by the value in register r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2/$ r$3$

$5.$ INC r$1$

$$ Description: Increment the value in register r$1$ by $1.$

$$ Operation: r$1=$ r$1+1$

$6.$ DEC r$1$

$$ Description: Decrement the value in register r$1$ by $1.$

$$ Operation: r$1=$ r$1-1$

Logical Instructions

$1.$ AND r$1,$ r$2,$ r$3$

$$ Description: Perform a bitwise AND on the values in registers r$2$ and r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2$ & r$3$

$2.$ OR r$1,$ r$2,$ r$3$

$$ Description: Perform a bitwise OR on the values in registers r$2$ and r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2|$ r$3$

$3.$ XOR r$1,$ r$2,$ r$3$

$$ Description: Perform a bitwise XOR on the values in registers r$2$ and r$3,$ and store the result in r$1.$

$$ Operation: r$1=$ r$2^$ r$3$

$4.$ NOT r$1,$ r$2$

$$ Description: Perform a bitwise NOT on the value in register r$2,$ and store the result in r$1.$

$$ Operation: r$1=$ ~r$2$

Control Flow Instructions

$1.$ JMP addr

$$ Description: Jump to the specified address.

$$ Operation: PC $=$ addr

$2.$ BEQ r$1,$ r$2,$ addr

$$ Description: Branch to the specified address if the values in registers r$1$ and r$2$ are equal.

$$ Operation: if $($r$1==$ r$2)$ PC $=$ addr

$3.$ BNE r$1,$ r$2,$ addr

$$ Description: Branch to the specified address if the values in registers r$1$ and r$2$ are not equal.

$$ Operation: if $($r$1!=$ r$2)$ PC $=$ addr

$4.$ CALL addr

$$ Description: Call a subroutine at the specified address.

$$ Operation: stack$[$SP$]=$ PC $+1$; SP $=$ SP $-1$; PC $=$ addr

$5.$ RET

$$ Description: Return from a subroutine.

$$ Operation: SP $=$ SP $+1$; PC $=$ stack$[$SP$]$

Memory Access Instructions

$1.$ LD r$1,$ addr

$$ Description: Load the value from the specified memory address into register r$1.$

$$ Operation: r$1=$ memory$[$addr$]$

$2.$ ST addr, r$1$

$$ Description: Store the value in register r$1$ to the specified memory address.

$$ Operation: memory$[$addr$]=$ r$1$

Custom Instructions $($for specialized applications$)$

$1.$ FFT r$1,$ r$2$

$$ Description: Perform a Fast Fourier Transform on the data starting at address r$2,$ and store the result in the location pointed to by r$1.$

$$ Operation: FFT$($memory$[$r$2],$ result$)$; memory$[$r$1]=$ result

$2.$ ENC r$1,$ r$2$

$$ Description: Encrypt the data starting at address r$2$ using a predefined encryption algorithm, and store the result in the location pointed to by r$1.$

$$ Operation: encrypted$\_$data $=$ Encrypt$($memory$[$r$2])$; memory$[$r$1]=$ encrypted$\_$data

$3.$ DEC r$1,$ r$2$

$$ Description: Decrypt the data starting at address r$2$ using a predefined decryption algorithm, and store the result in the location pointed to by r$1.$

$$ Operation: decrypted$\_$data $=$ Decrypt$($memory$[$r$2])$; memory$[$r$1]=$ decrypted$\_$data