feat: update project tt_um_obriensp_pll from obriensp/tt07-spo-pll-bits

Commit: c28541a3fda54407e575c542d1c18e8b34121c91
Workflow: https://github.com/obriensp/tt07-spo-pll-bits/actions/runs/9325203841

projects/tt_um_obriensp_pll/commit_id.json

@@ -1,8 +1,8 @@
 {
   "app": "custom_gds action",
   "repo": "https://github.com/obriensp/tt07-spo-pll-bits",
-  "commit": "58fe03c26da94ee8e6b3c4ccb6589cf658943b6d",
-  "workflow_url": "https://github.com/obriensp/tt07-spo-pll-bits/actions/runs/9321573577",
+  "commit": "c28541a3fda54407e575c542d1c18e8b34121c91",
+  "workflow_url": "https://github.com/obriensp/tt07-spo-pll-bits/actions/runs/9325203841",
   "sort_id": 1717174386738,
   "analog": true
 }

projects/tt_um_obriensp_pll/docs/info.md

@@ -9,11 +9,19 @@ You can also include images in this folder and reference them in the markdown. E
 
 ## How it works
 
+### VCO
 The VCO is a current-starved ring oscillator with a variable number of stages. The digital inputs `s0` and `s1` determine the number of stages. The analog `vcont` input controls the frequency by adjusting the amount of current received by the inverters.
 
+### PFD
+The PFD takes two input signals and uses the difference in phase+frequency to drive a charge pump.
+
 ## How to test
 
-Apply a voltage between 1.0V and 1.8V to `vcont` and observe the oscillator output on `uo0`.
+### VCO
+Apply a voltage between 1.0V and 1.8V to `vcont` (`ua0`) and observe the oscillator output on `uo0`.
+
+### PFD
+Apply two reference signals to the inputs `ui2` and `ui3` and observe the voltage change on `vout` (`ua1`).
 
 ## External hardware
 

projects/tt_um_obriensp_pll/info.yaml

@@ -25,8 +25,8 @@ pinout:
   # Inputs
   ui[0]: "vco0_s0"
   ui[1]: "vco0_s1"
-  ui[2]: ""
-  ui[3]: ""
+  ui[2]: "pfd0_clk"
+  ui[3]: "pfd0_ref"
   ui[4]: ""
   ui[5]: ""
   ui[6]: ""
@@ -54,7 +54,7 @@ pinout:
 
   # Analog pins - make sure to also set "analog_pins" above, else the pins won't be connected
   ua[0]: "vco0_vcont"
-  ua[1]: ""
+  ua[1]: "pfd0_vout"
   ua[2]: ""
   ua[3]: ""
   ua[4]: ""