摘要： 浮点连续乘-加、混合乘-加和三操作数加等浮点算术运算在科学计算领域中应用越来越频繁，为设计一款支持浮点连续 乘-加、混合乘-加和三操作数加的多功能浮点运算单元，提出一种可重构浮点混合/连续乘-加器，通过对控制位的配置可以实现多种浮点数据操作。该乘-加器采用8级流水线，可以实现单周期的浮点乘累加，大幅提高数据处理吞吐量，同时支持三操作数加和两操作数和的累加。在Modelsim SE6.6f中对该设计进行仿真验证，结果表明其能够在Xilinx Virtex-6 FPGA上实现，资源消耗2 631个LUT，频率可达250 MHz，结果证明该浮点混合/连续乘-加器具有较大的使用价值。
关键词:
浮点,
连续乘-加,
混合乘-加,
三操作数加,
可重构,
流水线
Abstract: As floating-point continuous multiply-add, fused multiply-add and multiply and three-operands addition operations are used more and more frequently in the field of scientific computing, a multi-purpose floating-point unit is designed which supports floating-point continuous multiply-add, fused multiply-add and multiply and three-operands addition is an urgent need. In this situation, a reconfigurable floating-point fused/continuous multiply-add structure is proposed. This reconfigurable floating-point fused/continuous multiply-adder can achieve a variety of floating-point data manipulation through configuration of the control bit. This reconfigurable floating-point fused/ continuous multiply-adder uses eight-stage pipe-line. It can achieve single-cycle multiply-accumulate, which greatly improves the throughput of the data processing and supports three-operand addition and two-operand sum’s accumulate simultaneously. This design is simulated and verified in Modelsim SE6.6f’s environment and the function is correct. When this design is implemented on Xilinx Virtex-6 FPGA, the resource consumption is 2 631 LUTs and the frequency is up to 250 MHz, and the result proves that the reconfigurable floating-point fused/continuous multiply-adder has a large value in use.
Key words:
floating point,
continuous multiply-add,
fused multiply-add,
three-operands addition,
reconfigurable,
pipeline
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