Updated references to pick up a handful of changes to the underlying sky130 and gf180mcu libraries.

diff --git a/VERSION b/VERSION
index 7c286e3..18e1034 100644
--- a/VERSION
+++ b/VERSION

@@ -1 +1 @@
-1.0.600
+1.0.601

diff --git a/gf180mcu/gf180mcu.json b/gf180mcu/gf180mcu.json
index 4cc8918..4a1e42a 100644
--- a/gf180mcu/gf180mcu.json
+++ b/gf180mcu/gf180mcu.json

@@ -97,18 +97,18 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "14f6fa62e17f43898db08961504cbfd8e61102a1",
-        "magic": "381714e2d5debf2ded71c5a6b6604e6b936422cf",
+        "open_pdks": "a45e68d8d64bae4f87e4fb62d2b55bc6922602dc",
+        "magic": "5cf1a46061ee1931753f4a13eec75cf65fd464b0",
         "gf180mcu_pdk": "a897aa30369d3bcec87d9d50ce9b01f320f854ef",
         "gf180mcu_fd_pr": "a0c31bd71c2084a5283204dc4e80f1f901d2d5d0",
-        "gf180mcu_fd_pv": "13f5cb3829f7ec3fe1d4469534fd60c12aaaa477",
+        "gf180mcu_fd_pv": "440fe9b995a3967fcdc3e694d8d61a83dd218b59",
         "gf180mcu_fd_io": "40cdef6d74ec5c9b7d596c147df94c98366afc5b",
         "gf180mcu_fd_sc_mcu7t5v0": "0ef8889a8df0acf959683fbe73013f342a2206a2",
         "gf180mcu_fd_sc_mcu9t5v0": "02b7af3f8d88c0b014d9af3db6a17f02aa983305",
         "gf180mcu_fd_ip_sram": "b98653230f05be17867c70870ecacfa6a6bca7ff",
-        "gf180mcu_as_sc_mcu7t3v3": "1f3fdf8dc19512f9d352c6c5134f4c786c62c698",
+        "gf180mcu_as_sc_mcu7t3v3": "c4648471c023690478e97c998edb6f2eac673298",
         "gf180mcu_re_efuse": "9941e38e7670a12f3f3a744bea4f9d2f04e6a669",
-        "gf180mcu_ocd_io": "f06b365b763826856be080f23b46047c50467072",
+        "gf180mcu_ocd_io": "6e0e354a78793339a4a004a6d9c08990d0eee3e4",
         "gf180mcu_ocd_alpha": "0597ebd5732987dbcd149e02c38525c1c5bf2a58",
         "gf180mcu_ocd_ip_sram": "efdbf734d806c2ac3b858d281a5b832625a8e928",
         "gf180mcu_osu_sc_gf12t3v3": "8a2f58f283a2eaa725314c9e1b8b7d1d343f23a3",

diff --git a/sky130/sky130.json b/sky130/sky130.json
index c478821..61c8b57 100644
--- a/sky130/sky130.json
+++ b/sky130/sky130.json

@@ -94,10 +94,10 @@
         "magic": "MAGIC_COMMIT"
     },
     "reference": {
-        "open_pdks": "14f6fa62e17f43898db08961504cbfd8e61102a1",
-        "magic": "381714e2d5debf2ded71c5a6b6604e6b936422cf",
+        "open_pdks": "a45e68d8d64bae4f87e4fb62d2b55bc6922602dc",
+        "magic": "5cf1a46061ee1931753f4a13eec75cf65fd464b0",
         "sky130_fd_pr": "403964dc7f9cca5ec1a8cc7b4f2a6f532b781676",
-        "sky130_fd_io": "b0c377d9c91b4152e0edd3a766a19185df819888",
+        "sky130_fd_io": "788a5c3de6447a8df43cb844309438babbb4f4bd",
         "sky130_fd_sc_hs": "c3d7991a9bcb4fc33cbd43262b44bb5560d6fdd0",
         "sky130_fd_sc_ms": "29650994547dd83610ccd0a29bae14d665a9e556",
         "sky130_fd_sc_ls": "4283919deb7eb4ed195c2b6e95431a812491f6d0",