You don't even need the 8 :), 4 quadrature inputs will fit on one PIO block.
Some lovely person got a quadrature decoder into 24 instructions, so you can potentially still do something useful on the same PIO block if you only need one or two quadrature encoders.
Some lovely person got a quadrature decoder into 24 instructions, so you can potentially still do something useful on the same PIO block if you only need one or two quadrature encoders.