AHA4524

www.DataSheet4U.com comtech aha corporation PRODUCT BRIEF AHA4524 (4 Kbit Block Version) TURBO PRODUCT CODE ENCODER/DECODER The AHA4524 device is a single-chip Turbo Product Code (TPC) Forward Error Correction (FEC) Encoder/Decoder. This device integrates independent TPC encoder and decoder functions, and can be configured for full or half duplex operation. In addition to TPC coding, the device includes helical interleaving, CRC computation, and data scrambling. Each of the functional blocks can be independently bypassed. Figure 1 shows the functional block diagram. The encoder and decoder accept data and configuration through a synchronous 3-wire or data bus interface designed to connect directly to a DSP or user logic. Encoder and decoder configuration registers are written and read through the same interface as the data. Configuration registers may be accessed at the start of every block transfer. The encode datapath, with all functional blocks enabled, computes and inserts CRC bits, scrambles the data, inserts error correction code (ECC) bits, and helically interleaves the data. The decoder datapath is the reverse of the encoder datapath. With all functional blocks enabled, the received data is helically deinterleaved before decoding. The decoder output is descrambled, and the CRC is computed to verify data integrity. Decoded data is then output in a serial bit stream. The decoder input interface includes an option to accept 4 bit parallel soft metric data symbols. The ...