ntRSD_UF core implements a time-domain Reed-Solomon decoding algorithm. The core is parameterized in terms of bits per symbol, maximum codeword length, maximum number of parity symbols as well as I/O data width, internal datapath and decoding engines parallelism. It also supports varying on the fly shortened codes. Therefore any desirable code-rate can be easily achieved rendering the decoder ideal for fully adaptive FEC applications. ntRSD_UF core supports erasure decoding thus doubling its error correction capability. The core also supports continuous or burst decoding. The core is designed and optimized for applications that need very high throughput data rates. The implementation is very low latency, high speed with a simple interface for easy integration in SoC applications.