The SM34020APCM40 graphics system processor (GSP) is the second generation of an advanced high-performance CMOS 32-bit microprocessor optimized for graphics display systems. With a built-in instruction cache (I-cache), the ability to simultaneously access memory and registers, and an instruction set designed to expedite raster graphics operations, the SM34020APCM40 provides user-programmable control of the CRT interface, as well as the memory interface [both standard DRAM and multiport video RAM (VRAM)]. The 4-gigabit (512-megabyte) physical address space is addressable on bit boundaries using variable width data fields (1 to 32 bits). Additional graphics addressing modes support 1-, 2-, 4-, 8-, 16-, and 32-bit-wide pixels.