1 files changed, 34 insertions, 0 deletions
diff --git a/tests/simple/omsp_dbg_uart.v b/tests/simple/omsp_dbg_uart.v
new file mode 100644
index 00000000..dc8860de
--- /dev/null
+++ b/tests/simple/omsp_dbg_uart.v
@@ -0,0 +1,34 @@
+
+module  omsp_dbg_uart (dbg_clk, dbg_rst, mem_burst, cmd_valid);
+
+input dbg_clk;
+input dbg_rst;
+input mem_burst;
+output cmd_valid;
+
+reg [2:0] uart_state;
+reg [2:0] uart_state_nxt;
+
+wire xfer_done;
+
+parameter  RX_SYNC  = 3'h0;
+parameter  RX_CMD   = 3'h1;
+parameter  RX_DATA = 3'h2;
+
+always @(uart_state or mem_burst)
+  case (uart_state)
+    RX_SYNC  : uart_state_nxt =  RX_CMD;
+    RX_CMD   : uart_state_nxt =  mem_burst ? RX_DATA : RX_SYNC;
+    RX_DATA : uart_state_nxt =  RX_SYNC;
+    default  : uart_state_nxt =  RX_CMD;
+  endcase
+   
+always @(posedge dbg_clk or posedge dbg_rst)
+  if (dbg_rst) uart_state <= RX_SYNC;
+  else if (xfer_done | mem_burst) uart_state <= uart_state_nxt;
+
+assign cmd_valid = (uart_state==RX_CMD) & xfer_done;
+assign xfer_done = uart_state!=RX_SYNC;
+   
+endmodule
+