When installing a 10-pin header for EPCS programming on Cyclone III / Cyclone IV, are the diodes and capacitors listed in the Device Handbook required?

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If Cyclone III / Cyclone IV has a 10pin header for EPCS programming, are the diodes and capacitors in the Device Handbook required?

According to each Device Handbook, Cyclone III / Cyclone IV requires connecting diodes and capacitors for DATA, DCLK, nCSO, and ASDO signals.

There are two reasons for connecting.

1. FPGA device protection when programming EPCS devices

When programming pof, the connection of the download cable between the EPCS and FPGA may cause impedance mismatch and induce undershoot/overshoot.

2. Normal configuration behavior

By providing a 10-pin header, it becomes more likely that this itself will become an antenna and put noise on each signal line. As a result, there is a considerable possibility that a stable configuration cannot be achieved.
To remove this, connect a diode and a capacitor to preserve the signal integrity of the control signal.

The Device Handbook describes the layout and characteristics of the diodes and capacitors used. Search for the keywords "In-System Programming of Serial Configuration Devices" and see the Notes.

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