cxp downconn: add gtx drp

src/gateware/cxp_downconn.py

@@ -20,14 +20,10 @@ class CXP_DownConn(Module, AutoCSR):
         self.tx_restart = CSR()
         self.txenable = CSRStorage()
 
-
         self.txinit_phaligndone = CSRStatus()
         self.rxinit_phaligndone = CSRStatus()
         self.rx_ready = CSRStatus()
 
-        self.tx_div = CSRStorage(3)
-        self.rx_div = CSRStorage(3)
-
         self.qpll_reset = CSR()
         self.qpll_locked = CSRStatus()
 
@@ -47,7 +43,6 @@ class CXP_DownConn(Module, AutoCSR):
             # PLL
             qpll.reset.eq(self.qpll_reset.re),
             self.qpll_locked.status.eq(qpll.lock),
-
             # GTX
             self.txinit_phaligndone.status.eq(gtx.tx_init.Xxphaligndone),
             self.rxinit_phaligndone.status.eq(gtx.rx_init.Xxphaligndone),
@@ -58,13 +53,47 @@ class CXP_DownConn(Module, AutoCSR):
             gtx.rx_restart.eq(self.rx_restart.re),
             gtx.tx_init.clk_path_ready.eq(self.tx_start_init.storage),
             gtx.rx_init.clk_path_ready.eq(self.rx_start_init.storage),
-            # gtx.rx_alignment_en.eq(self.rx_data_alignment.storage),
+        ]
 
-            # GTX DRP
+        # GTX Channels DRP
+        self.tx_div = CSRStorage(3)
+        self.rx_div = CSRStorage(3)
+
+        self.gtx_daddr = CSRStorage(9)
+        self.gtx_dread = CSR()
+        self.gtx_din_stb = CSR()
+        self.gtx_din = CSRStorage(16)
+
+        self.gtx_dout = CSRStatus(16)
+        self.gtx_dready = CSR()
+
+        self.comb += gtx.dclk.eq(ClockSignal("sys")),
+        self.sync += [
             gtx.tx_rate.eq(self.tx_div.storage),
             gtx.rx_rate.eq(self.rx_div.storage),
+
+            gtx.den.eq(0),
+            gtx.dwen.eq(0),
+            If(self.gtx_dread.re,
+                gtx.den.eq(1),
+                gtx.daddr.eq(self.gtx_daddr.storage),
+            ).Elif(self.gtx_din_stb.re,
+                gtx.den.eq(1),
+                gtx.dwen.eq(1),
+                gtx.daddr.eq(self.gtx_daddr.storage),
+                gtx.din.eq(self.gtx_din.storage),
+            ),
+            If(gtx.dready,
+               self.gtx_dready.w.eq(1),
+               self.gtx_dout.status.eq(gtx.dout),
+            ),
+            If(self.gtx_dready.re,
+               self.gtx_dready.w.eq(0),
+            ),
         ]
 
+
+
         # DEBUG: txusrclk PLL DRG
         
         self.txpll_reset = CSRStorage()
@@ -130,7 +159,13 @@ class CXP_DownConn(Module, AutoCSR):
             Instance("OBUF", i_I=aligned, o_O=pmod_pads[3]),
             Instance("OBUF", i_I=gtx.comma_det.ready, o_O=pmod_pads[4]),
             Instance("OBUF", i_I=valid_data, o_O=pmod_pads[5]),
+            # Instance("OBUF", i_I=, o_O=pmod_pads[6]),
             # Instance("OBUF", i_I=, o_O=pmod_pads[7]),
+
+            # Instance("OBUF", i_I=gtx.dclk, o_O=pmod_pads[0]),
+            # Instance("OBUF", i_I=gtx.den, o_O=pmod_pads[1]),
+            # Instance("OBUF", i_I=gtx.dwen, o_O=pmod_pads[2]),
+            # Instance("OBUF", i_I=gtx.dready, o_O=pmod_pads[3]),
         ]
 
         # DEBUG: datain
@@ -282,7 +317,6 @@ class QPLL(Module):
             )
         ]
 
-
 # Warning: Xilinx transceivers are LSB first, and comma needs to be flipped
 # compared to the usual 8b10b binary representation.
 class Comma_Detector(Module):
@@ -409,6 +443,15 @@ class GTX(Module):
         self.tx_rate = Signal(3)
         self.rx_rate = Signal(3)
 
+        # Dynamic Reconfiguration Ports
+        self.daddr = Signal(9)
+        self.dclk = Signal()
+        self.den = Signal()
+        self.dwen = Signal()
+        self.din = Signal(16)
+        self.dout = Signal(16)
+        self.dready = Signal()
+
         self.submodules.encoder = ClockDomainsRenamer("cxp_gtx_tx")(Encoder(2, True))
         self.submodules.decoders = [ClockDomainsRenamer("cxp_gtx_rx")(
             (Decoder(True))) for _ in range(2)]
@@ -624,6 +667,16 @@ class GTX(Module):
                 o_GTXTXP=pads.txp,
                 o_GTXTXN=pads.txn,
 
+                # Dynamic Reconfiguration Ports
+                p_IS_DRPCLK_INVERTED=0b0,
+                i_DRPADDR=self.daddr,
+                i_DRPCLK=self.dclk,
+                i_DRPEN=self.den,
+                i_DRPWE=self.dwen,
+                i_DRPDI=self.din,
+                o_DRPDO=self.dout,
+                o_DRPRDY=self.dready,
+
                 # ! loopback for debugging
                 i_LOOPBACK = self.loopback_mode,
                 p_TX_LOOPBACK_DRIVE_HIZ = "FALSE",