add a jk latch (as a comment), TODO

diff --git a/src/nmutil/latch.py b/src/nmutil/latch.py
index a334f6671f819449739d6cea8b8f1bd191a5a5f9..d845a954331be955681adac188d7e4f05c9ba4b5 100644 (file)
--- a/src/nmutil/latch.py
+++ b/src/nmutil/latch.py
@@ -2,6 +2,24 @@ from nmigen.compat.sim import run_simulation
 from nmigen.cli import verilog, rtlil
 from nmigen import Signal, Module, Elaboratable
 
+""" jk latch
+
+module jk(q,q1,j,k,c);
+output q,q1;
+input j,k,c;
+reg q,q1;
+initial begin q=1'b0; q1=1'b1; end
+always @ (posedge c)
+  begin
+    case({j,k})
+         {1'b0,1'b0}:begin q=q; q1=q1; end
+         {1'b0,1'b1}: begin q=1'b0; q1=1'b1; end
+         {1'b1,1'b0}:begin q=1'b1; q1=1'b0; end
+         {1'b1,1'b1}: begin q=~q; q1=~q1; end
+    endcase
+   end
+endmodule
+"""
 
 class SRLatch(Elaboratable):
     def __init__(self, sync=True):