From b78ae3aa55fb5c3b89b82790dc677e8eb46c28b1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vlastimil=20Slint=C3=A1k?= <slintak@uart.cz>
Date: Tue, 15 Jul 2025 14:06:02 +0200
Subject: [PATCH] Fixed constrains and board stackup based on PCBWay
 recommendations

---
 linht-hw.kicad_pcb | 28 ++++++++++++++--------------
 linht-hw.kicad_pro | 27 ++++++++++++++++++++-------
 2 files changed, 34 insertions(+), 21 deletions(-)

diff --git a/linht-hw.kicad_pcb b/linht-hw.kicad_pcb
index bdbacf6..8f037f9 100644
--- a/linht-hw.kicad_pcb
+++ b/linht-hw.kicad_pcb
@@ -3,12 +3,12 @@
 	(generator "pcbnew")
 	(generator_version "9.0")
 	(general
-		(thickness 1)
+		(thickness 0.982)
 		(legacy_teardrops no)
 	)
 	(paper "A4")
 	(layers
-		(0 "F.Cu" signal)
+		(0 "F.Cu" jumper)
 		(4 "In1.Cu" signal)
 		(6 "In2.Cu" signal)
 		(2 "B.Cu" signal)
@@ -30,7 +30,7 @@
 		(29 "B.CrtYd" user "B.Courtyard")
 		(35 "F.Fab" user)
 		(33 "B.Fab" user)
-		(39 "User.1" user)
+		(39 "User.1" back)
 		(41 "User.2" user)
 		(43 "User.3" user)
 		(45 "User.4" user)
@@ -53,9 +53,9 @@
 			)
 			(layer "dielectric 1"
 				(type "prepreg")
-				(thickness 0.1)
+				(thickness 0.196)
 				(material "FR4")
-				(epsilon_r 4.5)
+				(epsilon_r 4.74)
 				(loss_tangent 0.02)
 			)
 			(layer "In1.Cu"
@@ -64,9 +64,9 @@
 			)
 			(layer "dielectric 2"
 				(type "core")
-				(thickness 0.64)
+				(thickness 0.43)
 				(material "FR4")
-				(epsilon_r 4.5)
+				(epsilon_r 4.6)
 				(loss_tangent 0.02)
 			)
 			(layer "In2.Cu"
@@ -75,9 +75,9 @@
 			)
 			(layer "dielectric 3"
 				(type "prepreg")
-				(thickness 0.1)
+				(thickness 0.196)
 				(material "FR4")
-				(epsilon_r 4.5)
+				(epsilon_r 4.74)
 				(loss_tangent 0.02)
 			)
 			(layer "B.Cu"
@@ -14270,13 +14270,13 @@
 	(footprint "parts:MCM-iMX93"
 		(layer "F.Cu")
 		(uuid "83ebd95b-cb75-4643-ae77-58fef415c704")
-		(at 122.225 126.2 90)
+		(at 125.93725 133.6995 90)
 		(property "Reference" "U1"
 			(at -35.616 -40.324 90)
 			(unlocked yes)
 			(layer "F.SilkS")
 			(hide yes)
-			(uuid "7e262b7d-6f9b-487f-9a68-9d035380bd8e")
+			(uuid "8e094eb0-1ed7-4939-90a3-4ed0b59ada29")
 			(effects
 				(font
 					(size 0.6 0.6)
@@ -14289,7 +14289,7 @@
 			(unlocked yes)
 			(layer "F.Fab")
 			(hide yes)
-			(uuid "fe1707b5-0736-46c9-adff-21b42fcb3599")
+			(uuid "38f6e817-cda0-45b9-b094-a53dce58cb8d")
 			(effects
 				(font
 					(size 1 1)
@@ -14302,7 +14302,7 @@
 			(unlocked yes)
 			(layer "F.Fab")
 			(hide yes)
-			(uuid "1ebbd974-dd48-44b2-8c89-4eb52bc104a4")
+			(uuid "1b54bf95-687f-47e5-86a3-7c5f91f35691")
 			(effects
 				(font
 					(size 1 1)
@@ -14315,7 +14315,7 @@
 			(unlocked yes)
 			(layer "F.Fab")
 			(hide yes)
-			(uuid "1cce8b56-789e-4542-bcb7-7a8999c0b8a0")
+			(uuid "0ece8963-adcb-4c75-a6a0-fa1f82f2c640")
 			(effects
 				(font
 					(size 1 1)
diff --git a/linht-hw.kicad_pro b/linht-hw.kicad_pro
index b5e97e0..e379d0b 100644
--- a/linht-hw.kicad_pro
+++ b/linht-hw.kicad_pro
@@ -51,7 +51,13 @@
           "min_clearance": 0.25
         }
       },
-      "diff_pair_dimensions": [],
+      "diff_pair_dimensions": [
+        {
+          "gap": 0.0,
+          "via_gap": 0.0,
+          "width": 0.0
+        }
+      ],
       "drc_exclusions": [],
       "meta": {
         "version": 2
@@ -119,7 +125,7 @@
         "max_error": 0.005,
         "min_clearance": 0.0,
         "min_connection": 0.0,
-        "min_copper_edge_clearance": 0.5,
+        "min_copper_edge_clearance": 0.25,
         "min_groove_width": 0.0,
         "min_hole_clearance": 0.25,
         "min_hole_to_hole": 0.25,
@@ -127,11 +133,11 @@
         "min_microvia_drill": 0.1,
         "min_resolved_spokes": 2,
         "min_silk_clearance": 0.0,
-        "min_text_height": 0.8,
+        "min_text_height": 0.6,
         "min_text_thickness": 0.08,
         "min_through_hole_diameter": 0.3,
-        "min_track_width": 0.0,
-        "min_via_annular_width": 0.1,
+        "min_track_width": 0.15,
+        "min_via_annular_width": 0.15,
         "min_via_diameter": 0.5,
         "solder_mask_to_copper_clearance": 0.0,
         "use_height_for_length_calcs": true
@@ -180,7 +186,9 @@
           "td_width_to_size_filter_ratio": 0.9
         }
       ],
-      "track_widths": [],
+      "track_widths": [
+        0.0
+      ],
       "tuning_pattern_settings": {
         "diff_pair_defaults": {
           "corner_radius_percentage": 80,
@@ -207,7 +215,12 @@
           "spacing": 0.6
         }
       },
-      "via_dimensions": [],
+      "via_dimensions": [
+        {
+          "diameter": 0.0,
+          "drill": 0.0
+        }
+      ],
       "zones_allow_external_fillets": false
     },
     "ipc2581": {