LFE5U-85 vs XC6SLX75
A comparison of the Lattice ECP5 LFE5U-85 and the AMD Spartan-6 XC6SLX75 using the data from both vendors' selection guides.
Side-by-side specifications
| LFE5U-85 | XC6SLX75 | |
|---|---|---|
| Vendor / family | Lattice ECP5 | AMD Spartan-6 |
| LUTs as published | 84,000 LUT4 | 46,648 LUT6 |
| LUT type | 4-input look-up table | 6-input look-up table, fracturable into two LUT5 with shared inputs |
| LUT4 equivalent (approx.) | ≈84,000 | ≈74,637 |
| CoreScore (SERV cores) | 135 | — |
| Vendor logic figure | — | 74,637 LC |
| DSP | 156 18×18 multipliers | 132 DSP48A1 slices |
| Block RAM | 3.7 Mb | 3 Mb |
| Large RAM | — | — |
| Max. user I/O | 365 | 408 |
| Transceivers | None | None |
| Hard PCI Express | None | None |
| Hard processor | None | None |
| Process | 40 nm | 45 nm |
| Configuration memory | SRAM | SRAM |
| Packages | 4 | 3 |
| Design tool | Lattice Diamond | AMD ISE Design Suite |
Highlighted values are higher. LUT counts are shown as published; the LUT4 equivalent is an approximation to compare different LUT types, see how FPGA vendors count logic. Add up to two more devices to this comparison.
Key differences
The LFE5U-85 has about 13% more logic capacity (84K vs 74.6K LUT4 equivalents).
They use different logic architectures: the LFE5U-85 is built from LUT4 and the XC6SLX75 from LUT6, so the raw LUT counts (84K vs 46.6K) are not directly comparable.
For arithmetic, the LFE5U-85 has 156 18×18 multipliers against 132 DSP48A1 slices on the XC6SLX75.
The LFE5U-85 has more on-chip memory (3.7 Mb vs 3 Mb).
The LFE5U-85 is designed with Lattice Diamond; open source: F4PGA or Yosys + nextpnr-ecp5 with Project Trellis and the XC6SLX75 with AMD ISE Design Suite.
Full specifications
See the complete spec sheets with packages and grades: LFE5U-85 (ECP5) and XC6SLX75 (Spartan-6).