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Updated ALU to include PSH and POP

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Aadi Desai 2020-06-04 18:12:24 +01:00
parent 7997617e00
commit f6b3489884
1 changed files with 7 additions and 1 deletions
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8
alu.v
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@ -1,4 +1,4 @@
module alu (enable, Rs1, Rs2, Rd, opcode, mulresult, exec2, mul1, mul2, Rout, jump, carry); module alu (enable, Rs1, Rs2, Rd, opcode, mulresult, exec2, stackout, mul1, mul2, Rout, jump, carry);
input enable; // active LOW, disables the ALU during load/store operations so that undefined behaviour does not occur input enable; // active LOW, disables the ALU during load/store operations so that undefined behaviour does not occur
input signed [15:0] Rd; // input destination register input signed [15:0] Rd; // input destination register
@ -7,6 +7,7 @@ input signed [15:0] Rs2; // input source register 2
input [5:0] opcode; // opcode is fed in from instruction using wires outside ALU input [5:0] opcode; // opcode is fed in from instruction using wires outside ALU
input signed [31:0] mulresult; // 32-bit result from multiplier input signed [31:0] mulresult; // 32-bit result from multiplier
input exec2; // Input from state machine to indicate when to take in result from multiplication input exec2; // Input from state machine to indicate when to take in result from multiplication
input [15:0] stackout; // input from stack to be fed back to registers
output reg signed [15:0] mul1; // first number to be multiplied output reg signed [15:0] mul1; // first number to be multiplied
output reg signed [15:0] mul2; // second number to be multiplied output reg signed [15:0] mul2; // second number to be multiplied
@ -125,6 +126,11 @@ always @(*)
6'b100110: ; 6'b100110: ;
6'b100111: ; 6'b100111: ;
6'b101000: alusum = {1'b0, Rs1}; // PSH Push value to stack (Stack = Rs1)
6'b101001: alusum = {1'b0, stackout}; // POP Pop value from stack (Rd = Stack)
6'b101010: ;
6'b101011: ;
6'b111110: ; // NOP No Operation (Do Nothing for a cycle) 6'b111110: ; // NOP No Operation (Do Nothing for a cycle)
6'b111111: alusum = {1'b0, 16'h0000}; // STP Stop (Program Ends) 6'b111111: alusum = {1'b0, 16'h0000}; // STP Stop (Program Ends)