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Altera_Forum
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14 years ago

config fpgas with other fpga in AS mode

When I config FPGAs with other FPGA in AS mode,I met troubles below. When I select 3.3v LVTTL as IO STANDARD,the phenomenon is as below. FPGA-1 : the DCLK pin's voltage is about 3.3v FPGA-2 : ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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I think, DCLK should achieve full level with 2.5 and 3.3 V standard as well, because the pin is only capacitively loded.

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I also think so,but.... I will do test at other boards to watch the result.

besides this,I want to know whether there is any damage to the circuit If I select 2.5v Standard and 16mA current strength(the VCCIO = 3.3v),for that,until now,the main FPGA works normally at FPGAs configuration.