16-bit Scrambler/De-scrambler

The 16-bit Scrambler/De-scrambler allows scrambling and de-scrambling of two 8-bit PCI Express symbols in parallel. It is intended to be used with PHY chips using 16-bit PIPE interface (e.g., TI XIO1100 x1 PHY).

The purpose of the scrambler is to eliminate a repetitive pattern on the data stream. A repetitive pattern on a 2.5Gbs PCI Express data stream (such as 10101010) can generate significant EMI noise. By scrambling the data stream repetitive patterns are eliminated and thus spread the EMI energy over a broader range in the spectrum. This scrambling technique is often referred to as spread spectrum and is an effective way of whitening the noise.

Standard deliverables include an Actel-targeted netlist or fully-synthesizable VHDL/Verilog RTL, Simulation models and testbench, Comprehensive user's guide, Timing constraint files, and Technical support.