Merge pull request #114 from siliconcompiler/priority

Adding priority encoder

Author: aolofsson

lambdalib/veclib/__init__.py

@@ -3,14 +3,15 @@
 from .la_vbuf.la_vbuf import Vbuf
 from .la_vinv.la_vinv import Vinv
 from .la_vmux.la_vmux import Vmux
-from .la_vmux2.la_vmux2 import Vmux2
 from .la_vmux2b.la_vmux2b import Vmux2b
+from .la_vmux2.la_vmux2 import Vmux2
 from .la_vmux3.la_vmux3 import Vmux3
 from .la_vmux4.la_vmux4 import Vmux4
 from .la_vmux5.la_vmux5 import Vmux5
 from .la_vmux6.la_vmux6 import Vmux6
 from .la_vmux7.la_vmux7 import Vmux7
 from .la_vmux8.la_vmux8 import Vmux8
+from .la_vpriority.la_vpriority import Vpriority
 
 __all__ = ['Vbuf',
            'Vinv',
@@ -22,7 +23,9 @@
            'Vmux5',
            'Vmux6',
            'Vmux7',
-           'Vmux8']
+           'Vmux8',
+           'Vpriority'
+           ]
 
 
 class STDLib(Design):
@@ -41,3 +44,4 @@ def __init__(self):
             self.add_depfileset(Vmux6(), depfileset="rtl")
             self.add_depfileset(Vmux7(), depfileset="rtl")
             self.add_depfileset(Vmux8(), depfileset="rtl")
+            self.add_depfileset(Vpriority(), depfileset="rtl")

lambdalib/veclib/la_vpriority/la_vpriority.py

@@ -0,0 +1,12 @@
+from lambdalib.lambdalib import Lambda
+
+
+class Vpriority(Lambda):
+    def __init__(self):
+        name = 'la_vpriority'
+        super().__init__(name, __file__)
+
+
+if __name__ == "__main__":
+    d = Vpriority()
+    d.write_fileset(f"{d.name}.f", fileset="rtl")

lambdalib/veclib/la_vpriority/rtl/la_vpriority.v

@@ -0,0 +1,27 @@
+//#############################################################################
+//# Function: N-Input Priority Encoder                                        #
+//# Copyright: Lambda Project Authors. All rights Reserved.                   #
+//# License:  MIT (see LICENSE file in Lambda repository)                     #
+//#############################################################################
+
+module la_vpriority
+  #(parameter N   = 4 // number of inputs
+    )
+   (input [N-1:0]  requests, // request vector ([0] is highest priority)
+    output [N-1:0] grants    // outgoing grant vector
+    );
+
+   wire [N-1:0]   mask;
+   genvar         j;
+
+   // priority mask
+   assign mask[0] = 1'b0;
+   for (j=N-1; j>=1; j=j-1)
+     begin : ipri
+        assign mask[j] = |requests[j-1:0];
+     end
+
+   // priority grant circuit
+   assign grants[N-1:0] = requests[N-1:0] & ~mask[N-1:0];
+
+endmodule

pyproject.toml

@@ -1,23 +1,21 @@
 [build-system]
 requires = [
-    "setuptools >= 61.2",
-    "setuptools_scm[toml] >= 6.2"
+    "setuptools >= 64",
+    "setuptools_scm[toml] >= 8"
 ]
 build-backend = "setuptools.build_meta"
 
 [tool.setuptools]
 include-package-data = true
-packages = [
-    "lambdalib"
-]
+packages = ["lambdalib"]
 
 [project]
 name = "lambdalib"
 authors = [{name = "Zero ASIC"}]
 description = "Standardized ASIC design libraries"
 readme = "README.md"
 urls = {Homepage = "https://github.com/siliconcompiler/lambdalib"}
-requires-python = ">= 3.8"
+requires-python = ">= 3.9"
 license = {file = "LICENSE"}
 dependencies = [
     "siliconcompiler >= 0.34.3",