diff --git a/rtl/controller/src/controller.sv b/rtl/controller/src/controller.sv
index d60c265..4c49751 100644
--- a/rtl/controller/src/controller.sv
+++ b/rtl/controller/src/controller.sv
@@ -93,7 +93,7 @@ module control #(
     // axi stream is always accepted. If packet is not needed, it is discarded.
     assign s_axis_tready = 1'b1;
 
-    wire axis_hs = s_axis_tvalid & s_axis_tready;
+    (* MARK_DEBUG="true" *) wire axis_hs = s_axis_tvalid & s_axis_tready;
 
     // -------------------------------------------------------------------------
     // Shared 96-bit config bus in ETH domain
@@ -110,7 +110,7 @@ module control #(
     // [79:64]  pulse_num
     // [95:80]  pulse_height_raw[15:0]
     // -------------------------------------------------------------------------
-    logic [95:0] cfg_bus_eth;
+    (* MARK_DEBUG="true" *) logic [95:0] cfg_bus_eth;
     logic [95:0] cfg_shift_eth;
 
     // ETH-domain parser and control
@@ -121,12 +121,12 @@ module control #(
         ST_DISCARD      = 3'd3
     } eth_state_t;
 
-    eth_state_t eth_state;
+    (* MARK_DEBUG="true" *) eth_state_t eth_state;
 
     logic [3:0] cfg_byte_cnt;
 
     // Busy flag: set by START command, cleared by finish event from ADC domain
-    logic busy_flag_eth;
+    (* MARK_DEBUG="true" *) logic busy_flag_eth;
 
     // Pending ACKs for config delivery
     logic cfg_wait_dac_ack;
@@ -242,22 +242,12 @@ module control #(
                         end else begin
                             unique case (s_axis_tdata)
                                 CMD_SOFT_RESET: begin
-                                    // command packet must be exactly 1 byte
-                                    if (s_axis_tlast) begin
-                                        rst_toggle_eth <= ~rst_toggle_eth;
-                                    end else begin
-                                        eth_state <= ST_DISCARD;
-                                    end
+                                    rst_toggle_eth <= ~rst_toggle_eth;
                                 end
 
                                 CMD_START: begin
-                                    // command packet must be exactly 1 byte
-                                    if (s_axis_tlast) begin
-                                        start_toggle_eth <= ~start_toggle_eth;
-                                        busy_flag_eth    <= 1'b1;
-                                    end else begin
-                                        eth_state <= ST_DISCARD;
-                                    end
+                                    start_toggle_eth <= ~start_toggle_eth;
+                                    busy_flag_eth    <= 1'b1;
                                 end
 
                                 CMD_SET_DATA: begin