49eb6169b6
- Expand ft601_be from [1:0] to [3:0] across RTL, top-level, testbenches, and XDC (uncomment be[2:3] pin assignments B21/A21) - Fix NCO XSim testbench: correct reset check (0x7FFF not 0), add pipeline warmup and sample skip for DSP48E1 quadrature test - All local regression tests pass (39/39 USB, 10/10 integration, all co-sim)