ALTPLL - BANDWIDTH OPTION ?

Here is a professional and technically accurate English translation:

Hi,

I would like to ask about the meaning of the following setting in ALTPLL:

Bandwidth - Preset
Options: Auto, Preset (Low, L, H), Custom

What is the purpose of this setting?

I am using the FPGA device 10M02SCM153C8G and implementing an SCFIFO. Due to the signal logic requirements, I need to generate a stable 180-degree phase-shifted version of the signal and feed it into the SCFIFO, as well as to the FX2 IFCLK connected after the SCFIFO.

Currently, I am encountering a very rare issue: image tearing (or frame splitting).
My system architecture is: sensor → FPGA (FIFO) → FX2 → PC. Although this issue occurs very infrequently, I would still like to explore possible improvements.

Previously, the FPGA setting was configured as Auto, and under this condition, the image tearing issue occurred more frequently. After changing the setting to Low, the system became significantly more stable.

I am now considering whether to try the Medium setting, but before making further changes, I would like to understand what this bandwidth setting actually controls.

Would you like me to refine this into a more formal email style (for vendor support like Intel/Altera), or keep it as a technical discussion tone?