High-Level Design Space and Flexibility Exploration for Adaptive, Energy-Efficient WCDMA Channel Estimation Architectures

Listing 1

Example LISA code.

RESOURCE {

 REGISTER TClocked<int32> alu_in1, alu_in2, alu_out;

 PIPELINE pipe = {FETCH; DECODE; EXECUTE; WRITEBACK};

 /_∗...other resources ∗/

}

OPERATION alu32 IN pipe.DECODE {

 DECLARE {

  GROUP opcode= { add || sub || and || or || xor };

  /_∗... other declarations of operands∗/

 }

 CODING { 0b001 opcode source_operands }

 SYNTAX { opcode ∼" " destination "," source_operands }

 BEHAVIOR {

  /_∗ configure data path ∗/

  OUT.dp_mode = opcode;

 }

 /_∗ activate operand selection and datapath execution ∗/

 ACTIVATION { source_operands, datapath }

}

//...other operations

OPERATION add IN pipe.EXECUTE {

 //... declarations of operand types, etc

 CODING { 0b00001 }

 SYNTAX { "add" }

 BEHAVIOR {

  alu_out = alu_in1 + alu_in2;

 }

}