Forum Discussion

atech10's avatar
atech10
Icon for New Contributor rankNew Contributor
6 years ago

On my Altera Cyclone IV board I have 2 options. 1) Download code file from SPI memory to FPGA using Active serial (AS) mode. 2) Download .sof file from PC via SPI Bridge to FPGA using Passive serial (PS) mode.

In AS mode, you need 4 signals while in PS mode apparently only 2 signals. Active Serial Mode (AS) SPI Memory To FPGA DATA0 --> DATA0 DCLK <-- DCLK nCS <-- nCSO ASDI <-- ASDO ...
ShafiqY_Intel's avatar
ShafiqY_Intel
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Hi atech10,

For Active Serial Mode (AS), it should be working properly.

However, for Passive Serial Mode (PS) i'm not guarantee it will work. This pin should leave be unconnected when it is not used as AS mode. You can try it on your own risk.

Thanks