Enhanced Floating Point Unit IP Core
Main Features:
Fully IEEE 754-1985 Compliant Floating Point Functions. This enhanced implementation is fully
parameterizable. Sample precisions are:
- Single Precision (32 bit)
- Extended Single Precision (44 bit)
- Double Precision (64 bit)
- Extended Double Precision (80 bit)
- Any other user selected format
The enhanced floating point unit consists of the following building blocks:
- Floating Point Add/Subtract Unit (fasu)
- Floating Multiply Unit (fmul)
- Floating Point Divide Unit (fdiv)
- Floating Point Compare Unit (fcmp)
- Integer to Floating Point Conversion (i2fp)
- Floating Point to Integer Conversion (fp2i)
Additional functions can be easily added per customers request. All functions are written in Verilog as purely
combinatorial blocks.
Each block is available with any number of pipeline stages. A pipeline can be inserted and expanded to the
required number of stages to meet customers performance demands. After insertion of the pipeline,
retiming of each block will ensure maximum performance and optimization. This way any desired
clock frequency can be achieved.
All blocks handle normalized and denormalized numbers according to IEEE 754-1985 standard, and
provide various signals to identify special numbers.
Architecture:
Below diagram gives a conceptual overview of each function.
Verification:
All floating point functions have been thoroughly exercised. A test bench with several million test
vectors was developed. Utilizing open IEEE-754 compliant C libraries a test pattern generator was
developed to automatically create directed and random test patterns. We do everything possible to
ensure all our cores are 100% bug free !
Technology: 0.18 u process
| Function | Gate Count | Propagation Delay |
| 32 bit Add/Subtract Unit | 4,488 | 11.7 nS |
| 32 bit Multiply Unit | 12,155 | 13.1 nS |
| 32 bit Divide Unit | 30,294 | 39.2 nS |
| 32 bit Compare Unit | 514 | 2.3 nS |
| 64 bit Add/Subtract Unit | 9,069 | 13.1 nS |
| 64 bit Multiply Unit | 38,568 | 22 nS |
| 64 bit Divide Unit | ||
| 64 bit Compare Unit | 1,028 | 2.6 nS |
Price:
Tel:+ 1 408 781-8043 Fax: + 1 408
268-4173 Email:
info@hitechglobal.com
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