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## Floating Point Unit
A floating-point unit (FPU), also referred to as numeric co-processor, is a dedicated processing unit that manipulates numbers more quickly than the basic microprocessor circuit. The FPU does this by means of instructions that focus entirely on large mathematical operations such as addition, subtraction, multiplication, or division etc. The F-extension added in user project area, also referred to as FPU is capable to perform floating point addition, subtraction, multiplication, division, square-root and fused multiplication.The block diagram is shown in figure 1.1
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### FPU Architecture
The designed floating-point unit (FPU) is fully compliant with the IEEE-754 standard. It flags all five exceptions explained in subsection xx during result calculation as guided by IEEE-754 spec and has support to round result as per the five rounding modes. Additionally support for dynamic rounding is also added as indicated in RISC-V specifications. The rounding modes are explained in table 1.1. For being compliant with RISC-V F-Extension the unit is capable of performing basic arithmetic operations like comparison, addition, subtraction and multiplication. Moreover, the support for certain complex operations like division, square root of a number and computation of fused multiply-add. Certain other computational operations like integer to float conversion, float to integer conversion, computation of minimum and maximum of the two numbers along with sign injection is added. Caravel SoC core acts as a Wishbone master providing IP with control signals like data, address, cycle and strobe. The signals write FPU CSRs (explained in section 1.2.1) are decoded to provide information including operand A, operand B and operand C. Additionally, the operation that is to be performed and the rounding mode to be used are also provided. The selected module performs operation and the output result is written to an FPU CSR along with the exceptions flagged. The result and exceptions are then forwarded by wishbone slave to the core when requested.
