Wire up the extra signals for sky130 io

Author: robtaylor

chipflow_lib/platforms/__init__.py

@@ -8,14 +8,17 @@
 
 from .silicon import SiliconPlatformPort, SiliconPlatform
 from .sim import SimPlatform
-from .utils import (
-        IO_ANNOTATION_SCHEMA, IOSignature, IOModel,
+from ._utils import (
+        IO_ANNOTATION_SCHEMA, IOSignature, IOModel, IOTripPoint, IOModelOptions,
         OutputIOSignature, InputIOSignature, BidirIOSignature,
         )
 from ._packages import PACKAGE_DEFINITIONS
+from ._sky130 import Sky130DriveMode
 
-__all__ = ['IO_ANNOTATION_SCHEMA', 'IOSignature', 'IOModel',
+__all__ = ['IO_ANNOTATION_SCHEMA', 'IOSignature',
+           'IOModel', 'IOModelOptions', 'IOTripPoint',
            'OutputIOSignature', 'InputIOSignature', 'BidirIOSignature',
            'SiliconPlatformPort', 'SiliconPlatform',
            'SimPlatform',
+           'Sky130DriveMode',
            'PACKAGE_DEFINITIONS']

chipflow_lib/platforms/_packages.py

@@ -1,4 +1,4 @@
-from .utils import QuadPackageDef, BareDiePackageDef, GAPackageDef, Package
+from .utils import QuadPackageDef, BareDiePackageDef, Package
 from ._openframe import OpenframePackageDef
 
 # Add any new package types to both PACKAGE_DEFINITIONS and the PackageDef union

chipflow_lib/platforms/_sky130.py

@@ -0,0 +1,21 @@
+from enum import StrEnum, auto
+
+class Sky130DriveMode(StrEnum):
+    """
+    Models the potential drive modes of an IO pad.
+    Depending on process and cell library, these may be statically or dynamically configurable.
+
+    You will get an error if the option is not available with the chosen process and cell library
+    """
+    # Strong pull-up, weak pull-down
+    STRONG_UP_WEAK_DOWN = auto()
+    # Weak pull-up, Strong pull-down
+    WEAK_UP_STRONG_DOWN = auto()
+    # Open drain with strong pull-down
+    OPEN_DRAIN_STRONG_DOWN = auto()
+    # Open drain-with strong pull-up
+    OPEN_DRAIN_STRONG_UP= auto()
+    # Strong pull-up, weak pull-down
+    STRONG_UP_STRONG_DOWN = auto()
+    # Weak pull-up, weak pull-down
+    WEAK_UP_WEAK_DOWN = auto()