LFE5UM-45 vs XC6SLX45T
A comparison of the Lattice ECP5 LFE5UM-45 and the AMD Spartan-6 XC6SLX45T using the data from both vendors' selection guides.
Side-by-side specifications
| LFE5UM-45 | XC6SLX45T | |
|---|---|---|
| Vendor / family | Lattice ECP5 | AMD Spartan-6 |
| LUTs as published | 44,000 LUT4 | 27,288 LUT6 |
| LUT type | 4-input look-up table | 6-input look-up table, fracturable into two LUT5 with shared inputs |
| LUT4 equivalent (approx.) | ≈44,000 | ≈43,661 |
| CoreScore (SERV cores) | — | — |
| Vendor logic figure | — | 43,661 LC |
| DSP | 72 18×18 multipliers | 58 DSP48A1 slices |
| Block RAM | 1.9 Mb | 2 Mb |
| Large RAM | — | — |
| Max. user I/O | 245 | 296 |
| Transceivers | 4 × SERDES 3.2 Gb/s | 4 × GTP 3.2 Gb/s |
| Hard PCI Express | None | Gen1 x1 |
| Hard processor | None | None |
| Process | 40 nm | 45 nm |
| Configuration memory | SRAM | SRAM |
| Packages | 3 | 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
Both devices offer similar logic capacity: 44K and 43.7K LUT4 equivalents.
They use different logic architectures: the LFE5UM-45 is built from LUT4 and the XC6SLX45T from LUT6, so the raw LUT counts (44K vs 27.3K) are not directly comparable.
For arithmetic, the LFE5UM-45 has 72 18×18 multipliers against 58 DSP48A1 slices on the XC6SLX45T.
The LFE5UM-45 is designed with Lattice Diamond; open source: F4PGA or Yosys + nextpnr-ecp5 with Project Trellis and the XC6SLX45T with AMD ISE Design Suite.
Full specifications
See the complete spec sheets with packages and grades: LFE5UM-45 (ECP5) and XC6SLX45T (Spartan-6).