When deciding on the channel width between macros in an integrated circuit (IC) design, several factors need to be considered. Here is an active voice explanation of the process:

Determine power and signal requirements: Assess the power and signal requirements of the macros involved. Consider the current-carrying capacity and the number of signals that need to pass through the channel. This analysis helps establish an initial understanding of the required channel width.

Evaluate noise and crosstalk: Evaluate the potential for noise and crosstalk between macros. A wider channel can help reduce these issues by providing additional space for signal isolation and minimizing interference. Take into account the sensitivity of the signals and the proximity of the macros to determine an appropriate channel width.

Analyze thermal considerations: Thermal effects can impact the performance and reliability of macros. Consider the heat generated by the macros and the available thermal dissipation mechanisms. A wider channel can enhance heat dissipation, mitigating the risk of overheating and ensuring optimal performance.

Consider manufacturability:Evaluate the manufacturing capabilities and limitations of the chosen fabrication process. Consult with process engineers to determine the minimum channel width that can be reliably manufactured. Striking a balance between the desired channel width and manufacturability is important to ensure successful production.

Perform layout and routing studies: Utilize layout and routing tools to simulate the placement and interconnections of macros. Conduct studies to assess the impact of different channel widths on signal integrity, timing, and congestion. Iterate the design, adjusting the channel width as needed to optimize performance and avoid bottlenecks.

Collaborate with other design teams: Coordinate with other design teams involved in the project, such as the power delivery network (PDN) team or the package design team. Ensure alignment on the channel width to facilitate proper integration and compatibility with the overall IC system.

Verify and validate: Once the channel width is determined, conduct thorough verification and validation tests. Perform simulations, analyses, and physical measurements to ensure that the chosen width meets the design requirements and objectives.

By considering power and signal requirements, noise and crosstalk, thermal considerations, manufacturability, layout and routing studies, collaboration with other teams, and rigorous verification, designers can make informed decisions about the appropriate channel width between macros in IC design. This careful consideration contributes to the overall functionality, performance, and reliability of the integrated circuit.