Time-Division CAM Control for Peak Current Reduction

The patent divides the CAM array into multiple banks (e.g., Bank 0, Bank 1, Bank 2, Bank 3) and activates only one bank at a time during search operations. This segmentation allows parallel processing capability to be maintained across different time slots while reducing instantaneous power consumption and avoiding EM/IR problems that would occur if all units were activated simultaneously.

The patent implements periodic activation of different CAM banks using control signals (e.g., bank select signals BS0-BS3) that enable one bank at a time in a sequential manner. This periodic action maintains the overall parallel processing throughput while ensuring that power consumption and current density remain within safe limits at any given moment.

The patent segments the CAM array into multiple independent banks, each with its own dedicated power and ground lines. This segmentation prevents the EM/IR problems that would arise from sharing power and ground lines across the entire array, as each bank's power consumption is isolated and controlled, while still achieving area efficiency through the overall compact bank structure.

The patent provides different power and ground line configurations for different banks. Specifically, odd-numbered banks (Bank 1, Bank 3) use VDDP/VSSP power and ground lines, while even-numbered banks (Bank 0, Bank 2) use VDD/VSS power and ground lines. This local differentiation ensures that power consumption patterns in one bank do not interfere with adjacent banks, mitigating EM/IR problems while maintaining area efficiency.