Using remotesyn and added NCO

scripts/gen_sin_lut.py

@@ -0,0 +1,21 @@
+import math
+
+# for i in range(0, 64, 4):
+#     for j in range(4):
+#         val = math.sin((i+j) * math.pi/256)
+#         val = int(val*256*1.4)
+#         print(f"6'd{i+j}: dout=8'd{val}; ", end='')
+#     print('')
+
+
+N = 64              # quarter-wave samples
+AMP = 255           # 8-bit max
+for i in range(0, N, 4):
+    line = []
+    for j in range(4):
+        k = i + j
+        theta = k * math.pi / (2*N)      # 0 .. (π/2)*(N-1)/N ; never hits 1.0
+        val = int(math.floor(AMP * math.sin(theta) + 0.5))  # rounded, stays <=254
+        if val > 255: val = 255
+        line.append(f"6'd{k}: dout = 8'd{val};")
+    print(' '.join(line))

scripts/planahead.tcl

@@ -0,0 +1,6 @@
+create_project project_1 /tmp/project_1 -part xc6slx9tqg144-2
+set_property design_mode GateLvl [current_fileset]
+add_files -norecurse /data/joppe/projects/modem/out/synth/synth.ngc
+import_files -force -norecurse
+import_files -fileset constrs_1 -force -norecurse /data/joppe/projects/modem/boards/mimas_v1/constraints.ucf
+import_as_run -run impl_1 -twx /data/joppe/projects/modem/out/synth/timing.twx /data/joppe/projects/modem/out/synth/synth.ncd

scripts/program.sh

@@ -1 +0,0 @@
-openFPGALoader impl/pnr/modem.fs

scripts/run_all.sh

@@ -1 +0,0 @@
-gowin_sh scripts/run_all.tcl

scripts/run_all.tcl

@@ -1,2 +0,0 @@
-open_project modem.gprj
-run all

scripts/run_postsim.sh

@@ -1,13 +0,0 @@
-cvc \
-  +define+TIMING_SIM \
-  +acc \
-  +sdf_noerrors +sdf_nowarns \
-  +show_canceled_e +suppress_warns+653+3102 \
-  -v SIM/prim_tsim.v \
-  impl/pnr/modem.vo \
-  SIM/toplevel_tb.v \
-  SIM/globals.v \
-  +sdf_annotate+impl/pnr/modem.sdf+toplevel_tb.m_toplevel \
-  +maxdelays \
-  +librescan
-./cvcsim

scripts/run_sim.sh

@@ -1,23 +0,0 @@
-# iverilog -o toplevel_tb.vp \
-#     /opt/packages/gowin/IDE/simlib/gw1n/prim_sim.v \
-#     HW/toplevel.v \
-#     SIM/toplevel_tb.v
-# vvp toplevel_tb.vp
-
-cvc +acc \
-    +show_canceled_e +suppress_warns+653+3102 \
-    +define+FAST_PLL_SIM \
-    -v SIM/prim_tsim.v \
-    \
-    IP/gw_pllvr/gw_pllvr.v \
-    IP/gw_clkdiv8/gw_clkdiv8.v \
-    HW/toplevel.v \
-    HW/sampling.v \
-    \
-    SIM/sigmadelta_sampler.v \
-    \
-    SIM/sampling_tb.v \
-    SIM/globals.v \
-    +librescan
-./cvcsim
-    # SIM/toplevel_tb.v \