Add opcode ready flag to dispatcher

Author: outercloudstudio

src/main/scala/main/Core.scala

@@ -43,6 +43,7 @@ class Core extends Module {
   io.debug_dispatcher_program_pointer := dispatcher.io.program_pointer;
 
   val thread = Module(new Thread());
+  thread.io.dispatcher_opcode_loaded := dispatcher.io.opcode_loaded;
   thread.io.dispatcher_opcode := dispatcher.io.opcode;
   thread.io.dispatcher_program_pointer := dispatcher.io.program_pointer;
 

src/main/scala/main/Dispatcher.scala

@@ -12,6 +12,7 @@ class Dispatcher extends Module {
     val read_ready = Input(Bool());
     val read_opcode = Input(Operation());
 
+    val opcode_loaded = Output(Bool());
     val opcode = Output(Operation());
     val program_pointer = Output(UInt(8.W));
   });
@@ -21,6 +22,8 @@ class Dispatcher extends Module {
   val read_program_pointer = RegInit(0.U(8.W));
   io.read_program_pointer := read_program_pointer;
 
+  val opcode_loaded = RegInit(false.B);
+  io.opcode_loaded := opcode_loaded;
   val opcode = RegInit(Operation.NoOp);
   io.opcode := opcode;
   val program_pointer = RegInit(0.U(8.W));
@@ -33,6 +36,7 @@ class Dispatcher extends Module {
 
   when(io.read_ready) {
     opcode := io.read_opcode;
+    opcode_loaded := true.B;
     program_pointer := io.read_program_pointer;
     read_requested := false.B;
   }

src/main/scala/main/Thread.scala

@@ -4,6 +4,7 @@ import _root_.circt.stage.ChiselStage
 
 class Thread extends Module {
   val io = IO(new Bundle {
+    val dispatcher_opcode_loaded = Input(Bool());
     val dispatcher_opcode = Input(Operation());
     val dispatcher_program_pointer = Input(UInt(8.W));
 

src/test/scala/main/DispatcherTest.scala

@@ -8,6 +8,8 @@ class DispatcherTest extends AnyFlatSpec with ChiselScalatestTester {
       dut.io.thread_requesting_opcode.poke(true.B);
       dut.io.thread_program_pointer.poke(1.U(8.W));
 
+      dut.io.opcode_loaded.expect(false.B);
+
       dut.clock.step(1);
 
       dut.io.read_requested.expect(true.B);
@@ -20,6 +22,7 @@ class DispatcherTest extends AnyFlatSpec with ChiselScalatestTester {
 
       dut.clock.step(1);
 
+      dut.io.opcode_loaded.expect(true.B);
       dut.io.opcode.expect(Operation.Add);
       dut.io.program_pointer.expect(1.U(8.W));
     }