diff --git a/src/gateware/cxp.py b/src/gateware/cxp.py
index fab5c4c..f0cd545 100644
--- a/src/gateware/cxp.py
+++ b/src/gateware/cxp.py
@@ -26,16 +26,18 @@ class DownConn_Interface(Module, AutoCSR):
         # DEBUG: TX pipeline
         self.submodules.debug_src = debug_src = TX_Command_Packet()
         self.submodules.trig_ack = trig_ack = Trigger_ACK()
-        self.submodules.mux = mux = stream.Multiplexer(upconn_layout, 2)
-        self.submodules.conv = conv = stream.StrideConverter(upconn_layout, downconn_layout, reverse=True)
+        self.submodules.testseq = testseq = TX_Test_Packet()
+        self.submodules.mux = mux = stream.Multiplexer(upconn_layout, 3)
+        self.submodules.conv = conv = stream.StrideConverter(upconn_layout, downconn_layout)
 
         self.ack = CSR()
-        self.mux_sel = CSRStorage()
+        self.mux_sel = CSRStorage(4)
         self.sync += trig_ack.ack.eq(self.ack.re),
 
         self.comb += [
             debug_src.source.connect(mux.sink0),
             trig_ack.source.connect(mux.sink1),
+            testseq.source.connect(mux.sink2),
             mux.sel.eq(self.mux_sel.storage)
         ]
 
@@ -54,9 +56,11 @@ class DownConn_Interface(Module, AutoCSR):
 
         self.packet_type = CSRStatus(8)
         self.decoder_error = CSRStatus()
+        self.test_error = CSRStatus()
         self.comb += [
             self.packet_type.status.eq(recv_path.packet_type),
             self.decoder_error.status.eq(recv_path.decoder_err),
+            self.test_error.status.eq(recv_path.test_err),
         ]
         
         # DEBUG: CSR
@@ -67,6 +71,24 @@ class DownConn_Interface(Module, AutoCSR):
             recv_path.trig_clr.eq(self.trig_clr.re),
         ]
 
+        pak_start = Signal()
+        self.sync += [
+            pak_start.eq(recv_path.packet_decoder.sink.data == 0xFBFBFBFB),
+            
+        ]
+
+        self.specials += [
+            # # pmod 0-7 pin
+            Instance("OBUF", i_I=recv_path.packet_decoder.test_err, o_O=pmod_pads[0]),
+            Instance("OBUF", i_I=pak_start, o_O=pmod_pads[1]),
+            # Instance("OBUF", i_I=fifo_in.source.ack, o_O=pmod_pads[2]),
+            # Instance("OBUF", i_I=gtx.comma_checker.aligner_en, o_O=pmod_pads[3]),
+            # Instance("OBUF", i_I=gtx.comma_checker.check_reset, o_O=pmod_pads[4]),
+            # Instance("OBUF", i_I=gtx.comma_checker.has_comma, o_O=pmod_pads[5]),
+            # Instance("OBUF", i_I=gtx.comma_checker.has_error, o_O=pmod_pads[6]),
+            # Instance("OBUF", i_I=gtx.comma_checker.ready_sys, o_O=pmod_pads[7]),
+        ]
+
         
 class UpConn_Interface(Module, AutoCSR):
     def __init__(self, upconn_pads, sys_clk_freq, debug_sma, pmod_pads):