Added Verilog Module to ALU #593
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""" WalkthroughA static method named Changes
Assessment against linked issues
Assessment against linked issues: Out-of-scope changesNo out-of-scope changes were found. All modifications are directly related to implementing the Verilog module for the ALU as described in the linked issue. ✨ Finishing Touches
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Actionable comments posted: 4
🧹 Nitpick comments (1)
v1/src/simulator/src/modules/ALU.js (1)
182-236: Enhance method documentation and Verilog code formatting.The method lacks proper JSDoc documentation and the Verilog code could benefit from improved formatting and more detailed comments.
Add JSDoc documentation and improve Verilog formatting:
+ /** + * @memberof ALU + * @static + * @returns {string} Verilog module code for ALU implementation + * @description Generates parameterized Verilog code for ALU with configurable bit width + */ static moduleVerilog() { return ` -module ALU(cout, out, a, b, ctr); +module ALU #(parameter WIDTH = 1)(cout, out, a, b, ctr); + // Input declarations + input [WIDTH-1:0] a; // First operand + input [WIDTH-1:0] b; // Second operand + input [2:0] ctr; // 3-bit control signal + + // Output declarations + output reg [WIDTH-1:0] out; // ALU result + output reg cout; // Carry out flag
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v1/src/simulator/src/modules/ALU.js(1 hunks)
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v1/src/simulator/src/modules/ALU.js (1)
208-211:❓ Verification inconclusive
Verify the intentional behavioral difference for control signal 3.
The PR description mentions this difference is intentional, but it should be clearly documented and verified that this design choice aligns with the overall system requirements.
The JavaScript implementation leaves outputs unchanged for
ctr=3, while Verilog sets them to zero. Please confirm this behavioral difference is acceptable in the target system:
🏁 Script executed:
#!/bin/bash # Search for other references to ALU control signal 3 to understand expected behavior rg -A 5 -B 5 "controlSignalInput.*3|ctr.*3|control.*3" --type jsLength of output: 11217
Verify reserved ALU control (3) behavior and update documentation
In
v1/src/simulator/src/modules/ALU.js, the branch for} else if (this.controlSignalInput.value === 3) { this.message = 'ALU' }only sets the message and leaves both
this.output.valueandthis.carryOut.valueunchanged, whereas in the Verilog RTL the3'b011case explicitly drives them to zero. Please:
- Confirm this simulator–hardware discrepancy for control code 3 is intentional.
- Add a clarifying comment next to the
=== 3branch (and/or update the module’s README or design docs) stating that code 3 is reserved and leaves prior outputs intact in the simulator.File to update:
• v1/src/simulator/src/modules/ALU.js — lines around thecontrolSignalInput.value === 3branch
Fixes #560
Describe the changes you have made in this PR -
Note: Please check Allow edits from maintainers. if you would like us to assist in the PR.
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