The Coarse-GrainedFine-Grained Logic Interface in FPGAs with Embedded Floating-Point Arithmetic Units

Abstract EN

This paper examines the interface between fine-grained and coarse-grained programmable logic in FPGAs.

Specifically, it presents an empirical study that covers the location, pin arrangement, and interconnect between embedded floating point units (FPUs) and the fine-grained logic fabric in FPGAs.

It also studies this interface in FPGAs which contain both FPUs and embedded memories.

The results show that (1) FPUs should have a square aspect ratio; (2) they should be positioned near the center of the FPGA; (3) their I/O pins should be arranged around all four sides of the FPU; (4) embedded memory should be located between the FPUs; and (5) connecting higher I/O density coarse-grained blocks increases the demand for routing resources.

The hybrid FPGAs with embedded memory required 12% wider channels than the case where embedded memory is not used.