Abstract: A divider unit (15), having a divider circuit (16) and a divider controller (17), generates signed quotient and signed remainder signals in response to input signed dividend and signed divisor signals. The divider circuit (16) has an adder/subtracter unit (22), a mux (24), a zero/sign detector unit (23), and a shiftable register (28) which are controlled by the divider controller (17) and which cooperate to iteratively generate signed partial remainder and signed partial dividend signals, necessary for the computation of signed quotient and signed remainder signals, using either a restoring or non-restoring binary division algorithm.

Abstract: A reduced instruction set computer (RISC) with a Harvard architecture is disclosed. The RISC may be designed to be used simply as a RISC or may be designed to be used to emulate a complex instruction set computer (CISC). Or, it may be designed for use as either. A CISC design methodology is disclosed whereby a RISC is designed and fabricated and whereby RISC emulation code is written concurrently with design and fabrication and also subsequent to fabrication.