Corrected Wait for protocol ready.

libraries/io/i2c/tb/vhdl/tb_i2c_master.vhd

@@ -209,12 +209,17 @@ BEGIN
     proc_mem_mm_bus_wr(0, c_control_activate, clk, control_miso, control_mosi);
     
     -- Wait for protocol ready
-    WHILE control_status='0' LOOP
-      proc_mem_mm_bus_rd(0, clk, control_miso, control_mosi);  -- read result available in control_status
-      proc_mem_mm_bus_rd_latency(c_mem_reg_rd_latency, clk);
-      control_status <= control_miso.rddata(c_control_ready_bi);
-      proc_common_wait_some_cycles(clk, 1);
-    END LOOP;
+    -- . wait for control_interrupt
+    -- . do not use control_mosi to poll control_status, because then it can just occur that the read 
+    --   that act as acknowledge again clears the control_status before it got noticed in the
+    --   WHILE control_status='0' LOOP
+    proc_common_wait_until_high(clk, control_interrupt);
+    --WHILE control_status='0' LOOP
+    proc_mem_mm_bus_rd(0, clk, control_miso, control_mosi);  -- read result available in control_status
+    proc_mem_mm_bus_rd_latency(c_mem_reg_rd_latency, clk);
+    control_status <= control_miso.rddata(c_control_ready_bi);
+    proc_common_wait_some_cycles(clk, 1);
+    --END LOOP;
     
     -- Read result list
     FOR I IN 0 TO c_expected_mask'LENGTH-1 LOOP