ZiLOG/Littelfuse’s eZ80Acclaim! surpasses the competition, with a 50MHz core, 16MB of linear memory space, and dual CPU register sets for fast context switching. There are FIFOs connecting Ethernet hardware to system memory, and a flexible external bus scheme for accessing extra hardware. This block diagram of the eZ80F91 shows this part was designed with high-performance and value-add in mind.