LFE5U-85 vs XC7S75
A comparison of the Lattice ECP5 LFE5U-85 and the AMD Spartan-7 XC7S75 using the data from both vendors' selection guides.
Side-by-side specifications
| LFE5U-85 | XC7S75 | |
|---|---|---|
| Vendor / family | Lattice ECP5 | AMD Spartan-7 |
| Logic (LUT4-equivalent) | 84,000 | 76,800 |
| LUTs as published | 84,000 LUT4 | 48,000 LUT6 |
| Vendor logic figure | — LC | 76,800 LC |
| DSP | 156 18×18 multipliers | 140 DSP slices |
| Block RAM | 3.7 Mb | 3.2 Mb |
| Large RAM | — | — |
| Max. user I/O | 365 | 400 |
| Transceivers | None | None |
| Hard PCI Express | None | None |
| Hard processor | None | None |
| Process | 40 nm | 28 nm |
| Configuration memory | SRAM | SRAM |
| Packages | 4 | 2 |
| Design tool | Lattice Diamond | AMD Vivado |
Highlighted values are higher. Logic is compared in LUT4 equivalents; see how FPGA vendors count logic.
Key differences
The LFE5U-85 has about 9% more logic capacity (84K vs 76.8K LUT4 equivalents).
They use different logic architectures: the LFE5U-85 is built from LUT4 and the XC7S75 from LUT6, so the raw LUT counts (84K vs 48K) are not directly comparable.
For arithmetic, the LFE5U-85 has 156 18×18 multipliers against 140 DSP slices on the XC7S75.
The LFE5U-85 has more on-chip memory (3.7 Mb vs 3.2 Mb).
The LFE5U-85 is designed with Lattice Diamond and the XC7S75 with AMD Vivado.
Full specifications
See the complete spec sheets with packages and grades: LFE5U-85 (ECP5) and XC7S75 (Spartan-7).