# HG changeset patch
# User Mychaela Falconia <falcon@freecalypso.org>
# Date 1637968089 0
# Node ID 3becdb3b6dce9916d4c46c43bfeb3530a7cddc92
# Parent  32b848a081a3f1cd583e9ee7f397aabf7b44dd02
implement USB domain load resistor as proposed in document

diff -r 32b848a081a3 -r 3becdb3b6dce venus/src/MCL
--- a/venus/src/MCL	Fri Nov 26 23:02:19 2021 +0000
+++ b/venus/src/MCL	Fri Nov 26 23:08:09 2021 +0000
@@ -1015,6 +1015,12 @@
  footprint=0402
  npins=2
 
+R712:
+ hier=usb.Rload
+ value=3.3k
+ footprint=0402
+ npins=2
+
 # As an original FreeCalypso initiative, we are putting Pi network topologies
 # between the outputs of our RF3166 PA and the inputs of our Epcos quadband
 # FEM.  At PCB design time, we explicitly retain the freedom to populate a
diff -r 32b848a081a3 -r 3becdb3b6dce venus/src/usb/usb_domain.v
--- a/venus/src/usb/usb_domain.v	Fri Nov 26 23:02:19 2021 +0000
+++ b/venus/src/usb/usb_domain.v	Fri Nov 26 23:08:09 2021 +0000
@@ -36,6 +36,9 @@
 
 regulator_with_caps reg_3V3 (.GND(GND), .IN(P_5V), .OUT(P_3V3));
 
+/* load resistor per USB-and-mobile-domains article section 2.4.1 */
+resistor Rload (P_3V3, GND);
+
 usb_domain_buf buf (.GND(GND),
 		    .P_3V3(P_3V3),
 		    .Int_TxD(ADBUS[0]),