Transpose dual

NX_TRANSPOSE_DUAL_FIR is part of the NanoXplore DSP IP Cores. It implements a fully programmable parallel N-TAP FIR filter. It supports up to 56 taps.

It was developed to take full advantage of the NG-MEDIUM DSP blocks architecture and direct routing chaining features.

The implementation of the NX_TRANSPOSE_DUAL_FIR requires 1 DSP block per tap for the two channels. Some few additional logic (FFs and LUTs) for channels multiplexing and de-multiplexing is required.

The number of DSP blocks is reduced by a factor 2 comparing with the NX_TRANSPOSE_FIR and NX_SYSTOLIC_FIR. In a single CGB column, we can then implement a two-channel 56-tap FIR filter.

All filter parameters are user’s defined. No need to understand about architecture details to get the maximum performance.

The next figure shows the NX_TRANSPOSE_DUAL_FIR inputs, outputs and additional multiplexing and de-multiplexing logic.

The following is a summary of the features:

• Fully user’s programmable parallel dual channel FIR filter
• Requires Fs and Fs_x_2 clocks.
• Optional Synchronous reset (SRST - can be tied to ‘0’ if not used)
• Optional enable to activate of freeze all internal registers (ENA – can be tied to ‘1’ if not used)
• Up to 56 taps
• Data width : Up to 18-bit
• Coefficient width : Up to 24-bit
• Dynamic or fixed coefficients