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PLL Reconfig Intel FPGA IP cannot control PLL

STATEABC
Novice
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I plan to use PLL Reconfig Intel FPGA IP (polling mode) and PLL Intel FPGA, but in my project PLL Reconfig IP cannot drive PLL IP well

I modified the M/N/C/bandwidth/charge pump of PLL Reconfig IP through the state machine in my pll_control code, and then started configuration by writing 32'h1 to address 6'h2. However, no matter how I modify the M/N/C and bandwidth registers in PLL Reconfig IP, when I read mgmt_readdata[0] at the end of the state machine, it is always 0 instead of 1. The reconfig_to_pll passed by PLL Reconfig IP never changes, the reconfig_from_pll passed by PLL never changes, and the LOCK signal of PLL is always low. Is there any reason that may cause this?

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lixy
Employee
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Hi STATEABC,

May I confirm first whether you are using this Phase-Locked Loop Reconfiguration (ALTPLL_RECONFIG) IP in the link below?

https://www.intel.com/content/www/us/en/content-details/653729/phase-locked-loop-reconfiguration-altpll-reconfig-ip-core-user-guide.html

Also, which FPGA device are you using?

Thanks!


Best Regards,

Xiaoyan


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lixy
Employee
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Hi STATEABC, 

May I know if this question has been solved already? 

Best Regards,

Xiaoyan

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