Initial commit: Loongson FPGA SoC project for 2026 CIC-IEC

rtl/ip/confreg/int_ctrl.v

@@ -0,0 +1,61 @@
+module int_ctrl (
+    input  wire        clk,
+    input  wire        resetn,
+    input  wire [31:0] int_en,      
+    input  wire [31:0] int_edge,    
+    input  wire [31:0] int_pol,     
+    input  wire [31:0] int_in,      
+    input  wire [31:0] int_clr,     
+    input  wire [31:0] int_set,     
+    output wire [31:0] int_out      
+);
+
+    // 同步异步输入信号，防止亚稳态
+    reg [31:0] int_in_sync_d1;
+    reg [31:0] int_in_sync_d2;
+    reg [31:0] int_in_sync_d3; // 用于边沿检测
+
+    always @(posedge clk or negedge resetn) begin
+        if (!resetn) begin
+            int_in_sync_d1 <= 32'b0;
+            int_in_sync_d2 <= 32'b0;
+            int_in_sync_d3 <= 32'b0;
+        end else begin
+            int_in_sync_d1 <= int_in;
+            int_in_sync_d2 <= int_in_sync_d1;
+            int_in_sync_d3 <= int_in_sync_d2;
+        end
+    end
+
+    // 生成同步后的边沿信号
+    wire [31:0] rising_edge  =  int_in_sync_d2 & ~int_in_sync_d3;
+    wire [31:0] falling_edge = ~int_in_sync_d2 &  int_in_sync_d3;
+
+    // 边沿触发状态寄存器
+    reg [31:0] edge_int_state;
+    integer i;
+    always @(posedge clk or negedge resetn) begin
+        if (!resetn) begin
+            edge_int_state <= 32'b0;
+        end else begin
+            for (i = 0; i < 32; i = i + 1) begin
+                // 硬件检测优先级通常建议高于软件清除，防止丢失极窄脉冲
+                if (int_edge[i]) begin
+                    if ((int_pol[i] && rising_edge[i]) || (!int_pol[i] && falling_edge[i]))
+                        edge_int_state[i] <= 1'b1;
+                    else if (int_set[i])
+                        edge_int_state[i] <= 1'b1;
+                    else if (int_clr[i])
+                        edge_int_state[i] <= 1'b0;
+                end
+            end
+        end
+    end
+
+    // 电平触发逻辑
+    wire [31:0] level_int_state = int_in_sync_d2 ^ ~int_pol;
+
+    // 最终输出
+    assign int_out = int_en & ((int_edge & edge_int_state) | (~int_edge & level_int_state));
+
+endmodule