Fill HDMI CEC electrical from HDMI Specification 1.3 (2.79.0).

27 kΩ pull-up, VOL/VOH, 200 pF device / 700 pF cable, 5 Ω interconnect. TMDS/FRL Zdiff stays UNKNOWN.

tests/pcb/test_protocol_m6_m7.py

@@ -218,6 +218,10 @@ def test_ethernet_hdmi_skeletons_unknown_needed_document():
         assert all(p.incomplete for p in ifaces)
         for p in ifaces:
             for c in p.constraints:
+                if lid.startswith("hdmi") and (
+                    c.parameter == "cec" or c.parameter.startswith("cec_")
+                ):
+                    continue
                 assert c.value is None
                 assert c.value_kind != "NUMERIC"
                 if c.value_kind in {"UNKNOWN", "MISSING_SOURCE"}:

tests/pcb/test_protocol_pdf_pack.py

@@ -152,6 +152,29 @@ def test_dvi_not_hdmi_numeric_from_dvi_10():
     hdmi = next(p for p in cat.physical_interfaces if p.id == "hdmi-1.4-tmds-type-a")
     hz = next(c for c in hdmi.constraints if c.parameter == "differential_impedance")
     assert hz.value_kind == "UNKNOWN"
+    assert hz.value is None
+    hby = {c.parameter: c for c in hdmi.constraints}
+    _cite_ok(hby["cec"])
+    assert hby["cec"].value == 27000.0
+    assert hby["cec"].source.table == "CEC Table 2"
+    assert "1.3" in hby["cec"].source.revision
+    assert hby["cec"].source_type == "PCB"
+    _cite_ok(hby["cec_device_capacitance"])
+    assert hby["cec_device_capacitance"].value == 200.0
+    assert hby["cec_device_capacitance"].source.table == "Table 4-27"
+    _cite_ok(hby["cec_cable_capacitance"])
+    assert hby["cec_cable_capacitance"].value == 700.0
+    assert hby["cec_cable_capacitance"].source_type == "CABLE"
+    _cite_ok(hby["cec_vol_max"])
+    assert hby["cec_vol_max"].value == 0.6
+    _cite_ok(hby["cec_voh_min"])
+    assert hby["cec_voh_min"].value == 2.5
+    _cite_ok(hby["cec_interconnect_resistance"])
+    assert hby["cec_interconnect_resistance"].value == 5.0
+    frl = next(p for p in cat.physical_interfaces if p.id == "hdmi-frl-pcb")
+    fz = next(c for c in frl.constraints if c.parameter == "differential_impedance")
+    assert fz.value_kind == "UNKNOWN"
+    assert fz.value is None
     g = DesignGraph(
         components={
             "J3": Component(