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vondart's avatar
vondart
Icon for New Contributor rankNew Contributor
3 years ago
Solved

Cyclone IV E implementing SPI

I'm using EP4CE10 as a SPI Master to control LMX2820, then find the control words are not written correctly. Does the I/O pin selection and configuration has special requirement?
EBERLAZARE_I_Intel's avatar
EBERLAZARE_I_Intel
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hi,


We apologies for the lack of documentation from our side.


I hope the pervious links may help you in your design work.


vondart's avatar
vondart
Icon for New Contributor rankNew Contributor
3 years ago

I find that adding extra guard time between transmission of data enables successful register write. For 100m clock rate, 40 cycles are enough. Also, pin voltage must be set to 3.3V LVTTL. The repository I mentioned can successfully write individual 24-bits data and by adding guard time can write data bytes continuously.