XC6SLX4 vs XC7S6
A comparison of the AMD Spartan-6 XC6SLX4 and the AMD Spartan-7 XC7S6 using the data from both vendors' selection guides.
Side-by-side specifications
| XC6SLX4 | XC7S6 | |
|---|---|---|
| Vendor / family | AMD Spartan-6 | AMD Spartan-7 |
| LUTs as published | 2,400 LUT6 | 3,752 LUT6 |
| LUT type | 6-input look-up table, fracturable into two LUT5 with shared inputs | 6-input look-up table, fracturable into two LUT5 with shared inputs |
| LUT4 equivalent (approx.) | ≈3,840 | ≈6,003 |
| CoreScore (SERV cores) | — | — |
| Vendor logic figure | 3,840 LC | 6,000 LC |
| DSP | 8 DSP48A1 slices | 10 DSP slices |
| Block RAM | 0.2 Mb | 0.2 Mb |
| Large RAM | — | — |
| Max. user I/O | 132 | 100 |
| Transceivers | None | None |
| Hard PCI Express | None | None |
| Hard processor | None | None |
| Process | 45 nm | 28 nm |
| Configuration memory | SRAM | SRAM |
| Packages | 3 | 3 |
| Design tool | AMD ISE Design Suite | AMD Vivado |
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 XC7S6 has about 56% more logic capacity (6K vs 3.8K LUT4 equivalents).
For arithmetic, the XC7S6 has 10 DSP slices against 8 DSP48A1 slices on the XC6SLX4.
The XC6SLX4 is designed with AMD ISE Design Suite and the XC7S6 with AMD Vivado; open source: openXC7 (experimental) with Project X-Ray.
Full specifications
See the complete spec sheets with packages and grades: XC6SLX4 (Spartan-6) and XC7S6 (Spartan-7).