A maskable memory architecture for rank-order filtering

This work presents a novel implementation of rank-order filtering using maskable memory. Based on a bit-serial rank-order filtering algorithm the proposed design uses a special-defined memory, called parallel maskable memory (PMM) to realize major operations of rank-order filtering, polarization and update. Using the memory-orient architecture, the proposed rank-order filter can benefit from high flexibility, low cost and high speed. PMM has features of bit-sliced read, partial write, and pipelined datapath. Bit-sliced read and partial write are driven by maskable registers. The maskable registers allows PMM to configure operating bits. The bit-sliced read with a polarization selector allows PMM to perform polar determination while the partial write helps next-bit update. Recursively combining the bit-sliced read and partial write, PMM can effectively realizes rank-order filtering in terms of cost and speed.