EPM3128 5v output

Question

Hi guys, fine?I read on datasheet that the EPM3128 can output 5v, but when i go to pin planner i just can se 2.5v or 3.3vHow can i config to 5v output?Thanks

vininess · Answer

fvm · Answer

Hi,did the MultiVolt I/O chapter answer your question?MAX3000A can't drive higher output voltage than 3.3V VCCIO. It's sufficient high level for 5V TTL but possibley not 5V CMOS which requires e.g. 0.7*5 = 3.5 V minimal Vih. You can configure MAX3000A output as open drain and achieve 5V output with pull-up resistor in this case.

vininess · Answer

Hi"did the MultiVolt I/O chapter answer your question?"Not much, i'm kind confusedSo, i want to send a 8-bit dataline to a 5V processorHow can i config those pins to open drain?The restant of the system is 3.3V

fvm · Answer

Hi,not sure if there's an open drain output option in assignment editor for MAX3000, too many years since I used this device family. Depending on your design entry method, open drain can be setup in HDL or graphic design.

_ak6dn_ · Answer

I have an EPM3064A design that I have in Quartus 13.0sp1 done in verilog, and causing outputs to be detected and used in open collector mode is easy. Here is a snippet of my code where the RED ... GRN LED drivers are detected and setup as open collector.No other special setup in the .qsf files required, other than assignment to the appropriate pin number and the I/O type to "3.3-V LVTTL".    assign IO_RED = RED ? 1'b0 : 1'bz;
    assign IO_YEL = YEL ? 1'b0 : 1'bz;
    assign IO_GRN = GRN ? 1'b0 : 1'bz;

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EPM3128 5v output

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