 In 2005, further project requirements saw a new 16-bit processor, the XAP4, designed to supersede the XAP2 taking into account the experience gained on XAP3 and the evolving requirements of ASIC designs.XAP4 is a very small, 12,000-gate, Von Neumann bus, 16-bit processor core capable of addressing a total of 64 kBytes of memory for programs, data and peripherals.It offers high code density combined with good performance in the region of 50 Dhrystone MIPS when clocked at 80 MHz.