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FPGA Implementations of Radix-10 Digit Recurrence Fixed-Point and Floating-Point Dividers

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3 Author(s)
Baesler, M. ; Inst. for Reliable Comput., Hamburg Univ. of Technol., Hamburg, Germany ; Voigt, S. ; Teufel, T.

In this paper we present three different radix-10 digit recurrence division algorithms for FPGA architectures. The first one implements the simple shift-and-subtract algorithm, whereas the second and third implementations each perform digit recurrence algorithm with signed-digit redundant quotient alculation and carry-save representation of the residuals. However, the second divider computes the quotient digit using a ROM whereas the third divider uses a quotient digit decomposition and requires neither a ROM nor a multiplexer. Furthermore, the fixed-point divider is extended to support IEEE 754-2008 compliant decimal floating-point division for decimal64 data format. Finally, the algorithms have been synthesized on a Xilinx Virtex-5 FPGA and implementation results are given.

Published in:

Reconfigurable Computing and FPGAs (ReConFig), 2011 International Conference on

Date of Conference:

Nov. 30 2011-Dec. 2 2011

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