Add multiplier unit

1 files changed, 45 insertions, 0 deletions

diff --git a/tb/dsp_mul.sv b/tb/dsp_mul.sv
new file mode 100644
index 0000000..d6fcb6a
--- /dev/null
+++ b/tb/dsp_mul.sv
@@ -0,0 +1,45 @@
+module dsp_mul
+(
+	output logic [63:0] result,  //  result.result
+	input  logic [31:0] dataa_0, // dataa_0.dataa_0
+	input  logic [31:0] datab_0, // datab_0.datab_0
+	input  logic        signa,   //   signa.signa
+	input  logic        signb,   //   signb.signb
+	input  logic        clock0,  //  clock0.clock0
+	input  logic        ena0,    //    ena0.ena0
+	input  logic        aclr0,   //   aclr0.aclr0
+	input  logic [63:0] chainin  // chainin.chainin
+);
+
+	logic[31:0] hold_a, hold_b;
+	logic[63:0] hold_chainin, ext_a, ext_b, product;
+	logic hold_signa, hold_signb;
+
+	assign ext_a = {{32{hold_signa && hold_a[31]}}, hold_a};
+	assign ext_b = {{32{hold_signb && hold_b[31]}}, hold_b};
+
+	always_comb
+		unique case({hold_signa, hold_signb})
+			2'b00: product = ext_a * ext_b;
+			2'b01: product = ext_a * $signed(ext_b);
+			2'b10: product = $signed(ext_a) * ext_b;
+			2'b11: product = $signed(ext_a) * $signed(ext_b);
+		endcase
+
+	always @(posedge clock0 or negedge aclr0)
+		if(!aclr0) begin
+			result <= {64{1'bx}};
+			hold_a <= {32{1'bx}};
+			hold_b <= {32{1'bx}};
+			hold_signa <= 1'bx;
+			hold_signb <= 1'bx;
+		end else if(ena0) begin
+			hold_a <= dataa_0;
+			hold_b <= datab_0;
+			hold_chainin <= chainin;
+			hold_signa <= signa;
+			hold_signb <= signb;
+			result <= hold_chainin + product;
+		end
+
+endmodule