diff --git a/himbaechel/uarch/ng-ultra/bitstream.cc b/himbaechel/uarch/ng-ultra/bitstream.cc
index 72208fc0..0ec7b4a7 100644
--- a/himbaechel/uarch/ng-ultra/bitstream.cc
+++ b/himbaechel/uarch/ng-ultra/bitstream.cc
@@ -421,6 +421,15 @@ struct BitstreamJsonBackend
         close_instance();
     }
 
+    void write_dsp(CellInfo *cell) {
+        open_instance(cell);
+        add_config("raw_config0", extract_bits_or_default(cell->params, ctx->id("raw_config0"), 27));
+        add_config("raw_config1", extract_bits_or_default(cell->params, ctx->id("raw_config1"), 24));
+        add_config("raw_config2", extract_bits_or_default(cell->params, ctx->id("raw_config2"), 14));
+        add_config("raw_config3", extract_bits_or_default(cell->params, ctx->id("raw_config3"), 3));
+        close_instance();
+    }
+
     void write_interconnections()
     {
         for (auto &net : ctx->nets) {
@@ -488,7 +497,7 @@ struct BitstreamJsonBackend
                 //case id_XCDC.index:
                 //case id_CRX.index:
                 //case id_CTX.index:
-                //case id_DSP.index:
+                case id_DSP.index: write_dsp(cell.second.get()); break;
                 case id_PLL.index: write_pll(cell.second.get()); break;
                 //case id_PMA.index:
                 //case id_Service.index:
diff --git a/himbaechel/uarch/ng-ultra/pack.cc b/himbaechel/uarch/ng-ultra/pack.cc
index 54700efe..c8ed1fdf 100644
--- a/himbaechel/uarch/ng-ultra/pack.cc
+++ b/himbaechel/uarch/ng-ultra/pack.cc
@@ -1294,6 +1294,22 @@ void NgUltraPacker::pack_rams(void)
     }
 }
 
+void NgUltraPacker::pack_dsps(void)
+{
+    log_info("Packing DSPs..\n");
+    for (auto &cell : ctx->cells) {
+        CellInfo &ci = *cell.second;
+        if (!ci.type.in(id_NX_DSP_U))
+            continue;
+        ci.type = id_DSP;
+        bind_attr_loc(&ci, &ci.attrs);
+
+        for (auto &p : ci.ports) {
+            if (p.second.type == PortType::PORT_IN) 
+                disconnect_if_gnd(&ci, p.first);
+        }
+    }
+}
 void NgUltraPacker::setup()
 {
     // Note: These are per Cell type not Bel type
@@ -1381,6 +1397,7 @@ void NgUltraImpl::pack()
     packer.pack_plls();
     packer.pack_wfgs();
     packer.pack_rams();
+    packer.pack_dsps();
     packer.pack_rfs();
     packer.pack_cys();
     packer.pack_lut_dffs();
diff --git a/himbaechel/uarch/ng-ultra/pack.h b/himbaechel/uarch/ng-ultra/pack.h
index 46b747c3..1c2cb7a0 100644
--- a/himbaechel/uarch/ng-ultra/pack.h
+++ b/himbaechel/uarch/ng-ultra/pack.h
@@ -51,6 +51,7 @@ struct NgUltraPacker
     void pack_rfs();
 
     void pack_rams();
+    void pack_dsps();
 
     // IO
     void pack_iobs();