LFE5U-85 vs XC6SLX100
A comparison of the Lattice ECP5 LFE5U-85 and the AMD Spartan-6 XC6SLX100 using the data from both vendors' selection guides.
Side-by-side specifications
| LFE5U-85 | XC6SLX100 | |
|---|---|---|
| Vendor / family | Lattice ECP5 | AMD Spartan-6 |
| LUTs as published | 84,000 LUT4 | 63,288 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 | ≈101,261 |
| CoreScore (SERV cores) | 135 | — |
| Vendor logic figure | — | 101,261 LC |
| DSP | 156 18×18 multipliers | 180 DSP48A1 slices |
| Block RAM | 3.7 Mb | 4.7 Mb |
| Large RAM | — | — |
| Max. user I/O | 365 | 480 |
| 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 XC6SLX100 has about 21% more logic capacity (101K vs 84K LUT4 equivalents).
They use different logic architectures: the LFE5U-85 is built from LUT4 and the XC6SLX100 from LUT6, so the raw LUT counts (84K vs 63.3K) are not directly comparable.
For arithmetic, the XC6SLX100 has 180 DSP48A1 slices against 156 18×18 multipliers on the LFE5U-85.
The XC6SLX100 has more on-chip memory (4.7 Mb vs 3.7 Mb).
The LFE5U-85 is designed with Lattice Diamond; open source: F4PGA or Yosys + nextpnr-ecp5 with Project Trellis and the XC6SLX100 with AMD ISE Design Suite.
Full specifications
See the complete spec sheets with packages and grades: LFE5U-85 (ECP5) and XC6SLX100 (Spartan-6).