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Floating Point Chisel Modules

This library implements pipelined floating point arithmetic units in the Chisel hardware description language. They can be used as third-party IP blocks in your Chisel or Verilog hardware descriptions.

There are modules for floating point addition and multiplication. Both single-precision and double-precision numbers are supported.

Classes

  • FPMult32, FPMult64 - Single-precision and double-precision multipliers with single-cycle pipeline latency
  • FPAdd32, FPAdd64 - Single-precision and double-precision adders with three cycle pipeline latency

Note: These modules have not been thoroughly verified. Though the basic functionality is known to work, there may be corner cases which are not handled properly. In particular, there is no support for NaN, infinity, or denormalized numbers other than zero. There is also no exponent overflow or underflow detection. If you care about these things, do not use these modules.

Example Usage

val adder = Module(new FPAdd32())
adder.io.a := FIRST_INPUT
adder.io.b := SECOND_INPUT
OUTPUT := adder.io.res

The other modules have the same interface.

License

Copyright © 2014 Howard Zhehao Mao

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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Floating point modules for CHISEL

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