The 7 series CLB is identical to that in the Virtex 6 FPGA family. The CLB is very similar to that of the Spartan 6 FPGA family with these differences:
- Columnar architecture
- Scales easily to higher densities
- More routing between CLBs
- SLICEL and SLICEM only (no Spartan 6 FPGA
SLICEX)
- All slices support carry logic
- More optimized
The common features in the CLB structure simplify design migration from the Spartan 6 and Virtex 6 families to the 7 series devices. The unique floorplan means that location constraints should be removed before implementing designs originally targeted to earlier FPGAs. The interconnect routing resources are increased in size, quantity, and flexibility relative to the Virtex 6 FPGA family, improving the quality of automatic place and route results.