3.2.1. Input Cascade
Input cascade feature is supported on ay and by input bus. When you set Enable input cascade for 'ay' input to Yes, the Arria 10 Native Fixed Point DSP IP core will take inputs from scanin input signals instead of ay input bus. When you set Enable input cascade for 'by' input to Yes, the Arria 10 Native Fixed Point DSP IP core will take inputs from ay input bus instead of by input bus.
It is recommended to enable the input registers for ay and/or by whenever input cascade is enabled for correctness of application. When you enable the input registers for ay and by, the clock source of these registers must be the same.
You can enable the delay registers to match the latency requirement between the input register and the output register. There are 2 delay registers in the core. The top delay register is used for ay or scanin input ports while the bottom delay register is used for scanout output ports. These delay registers are supported in 18 × 18 full mode, 18 × 18 sum of 2 mode and 18 × 18 systolic mode.
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