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Altera_Forum
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15 years ago

Problems with ALTASMI_PARALLEL megafunction

Hi, I'm trying to use ALTASMI_PARALLEL in a Cyclone design with an EPCS1. The problem is that all the code which drives this megafunction, and the megafunction itself, gets optimised away duri...
Altera_Forum's avatar
Altera_Forum
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10 years ago

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I have a similar problem, but I don't read at all. I only use the component to write to the configuration memory.

I have tried to set rden=1 (which feels strange when you don't want to read), but the component is optimized away anyway.

Is there any specific operation I need to perform to get it to stay in my design?

I tried to forward some of the address lines to a debug pin or use signal tap, in this case the component stays and work, but I don't want this code in my final product.

Thanks / Joakim

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If your application code never reads the EEPROM then I'm assuming the data you are writing is new configuration bitstream, for use when the device is reconfigured, i.e. a sort of bootloader?

In that case I would try adding a synthesis keep or preserve attribute to the signals mapped to the ASMI instance.

For a bootloader, especially one to be used by the end customer, I would always read back and verify the EEPROM data anyway.

Regards

Rhydian.