Design Example: Floating-Point Converter

Binary floating-point arithmetic is commonly used to represent real numbers on computers because it can represent a wide range of numbers. When implemented in FPGAs, however, floating-point can use considerable logic resources. Therefore, designers use fixed-point because of its better performance and lesser resource utilization. Essentially, a floating-point number is converted to a fixed-point before an operation. The result is then converted back to a floating-point for compatibility with other systems.

Efinix provides example design that demonstrates the conversion between floating-point and fixed-point numbers. The design targets the Titanium Ti60 F225 Development Board and Trion® T120 BGA576 Development Board. The example design includes Efinity Virtual I/O Debugger core for customizing and monitoring the design.

Features

• Floating-point to fixed-point conversion
• Fixed-point to floating-point conversion
• Binary floating-point complies with IEEE 754 standard
• Supports floating-point of single-precision (32-bit) and double-precision (64-bit)
• Supports all floating-point numbers
• Supports a fixed-point width of 3 to 64 bits
• Optional asynchronous reset and clock enable ports for both float-to-fixed and fixed-to-float converters
• Optional output ports indicating overflow, underflow, not-a-number (NaN), infinity, zero, and denormalized number in float-to-fixed converter
• Fully-pipelined design with six pipeline stages
• RTL design in Verilog HDL
• Round to nearest, ties away from zero rounding rule

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