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--- language:interface [2023/04/09 18:56]
rajit [Interfaces]
+++ language:interface [2023/04/09 19:01] (current)
rajit [Parameter types]
@@ Line 27: / Line 27: @@
 ==== Parameter types ====
-**Needs to be updated**
 The special ''ptype'' meta-parameter type is used to pass in types
@@ Line 49: / Line 47: @@
 <code act>
 // A constructor for a datapath with W-bit ripple connections, and
-// where each component has M inputs and one output
+// where each component has an additional M inputs and one output
-// A skeleton
+// Interface definition
 template<pint W, pint M>
-defproc bitslice (e1of2? rin[W]; e1of2! rout[W];
+interface bitslice (e1of2? rin[W]; e1of2! rout[W]; e1of2? in[M]; e1of2! out);
-                  e1of2? in[M]; e1of2! out) { }
 // the constructor
@@ Line 61: / Line 58: @@
                      e1of2? in[M*N]; e1of2! out[N])
 {
-   t x[N];
+   t x[N];  // array of type "t" that exports a bitslice<W,M> interface
    // ripple connections
-   (;i:N-1: x[i].rout=x[i+1].rin);
+   (i:N-1: x[i].rout=x[i+1].rin;)
    x[0].rin=rin;
    x[N-1].rout=rout;
    // i/o connections
-   (;i:N: x[i].in[i*M..(i+1)*M-1] = in[i*M..(i+1)*M-1];
+   (i:N: x[i].in = in[i*M..(i+1)*M-1];
-          x[i].out=out[i] )
+          x[i].out=out[i]; )
 }
-// A one-bit adder
+// A one-bit adder, that exports the bitslice interface
-defproc onebit (e1of2? in[2], rin[1]; e1of2! out, rout[1]) { ... }
+defproc onebit (e1of2? in[2], rin[1]; e1of2! out, rout[1])
+                 :>  bitslice<1,2> { in -> in, rin -> rin, out -> out, rout -> rout }
+{ ... }
 defproc ripple_adder (e1of2? a[32], b[32], cin; e1of2! out[32], cout)
 {
-    build_dpath<32,2,1,onebit> dp;
+    build_dpath<32,2,1,@onebit> dp;
-    (; i : 32 : dp.in[2*i] = a[i]; dp.in[2*i+1] = b[i]);
+    (i : 32 : dp.in[2*i] = a[i]; dp.in[2*i+1] = b[i];)
     dp.out = out;
     dp.rin[0] = cin;
-    dp.rout[0] = cout
+    dp.rout[0] = cout;
 }
 </code>
+Process type (''ptype'') parameters for templates use the ''@'' character (as in ''@onebit'') in the example above.