A floating-point divider using redundant binary circuits and an asynchronous clock scheme

This paper describes a new floating-point divider (FDIV) using redundant binary circuits on an asynchronous clock scheme for an internal iterative operation. The redundant binary representation of +1=(1,0), 0=(0,0), -1+(0,1) is applied to the all mantissa division circuits. The simple and unified representation reduces circuit delay for the quotient determination. Additionally, the asynchronous clock reduces a clock margin overhead. The architecture design avoids post processes, whose main role is to produce the floating-point status flags. The FDIV core using proposed technologies operates at 42.1 ns with 0.35 μm CMOS technology and triple metal interconnections. The small core of 13.5 k transistors is laid-out in 730 μm×910 μm area