I'm a freshman working on the Nios II Development Kit, Stratix II Edition. I want to use this Development Kit to control a vedio decoder.This vedio decoder is designed to work with 3.3V signals, and are not tolerant of 5V signals.I know the proto1 & proto2 connectors on the development kit can output 5V signals. The Reference manual http://www.altera.com.cn/literature/manual/mnl_nios2_board_stratixii_2s60_rohs.pdf said , "The output logic-level on the expansion prototype connector pins is 3.3 V." -page27. I don't know how to use the proto1 & proto2 connectors to output 3.3V signals. Can you tell me the answer? Or is there any other connectors on the board can output 3.3V signal which is controlled by the FPGA? Many thanks! Sincerely Tannya
In fact, acording to Reference Manual, proto connectors pins output 3.3 v, they have a 5 v protection circuit. Select in your pin assignments the 3.3 LVTTL I/O standard for every pin.
Thank you very much for your prompt reply. I'm also a little confused about it.I've read the stratixii_niosii_2s60_db_rev01_sch.pdf http://www.altera.com.cn/literature/manual/stratixii_niosii_2s60_rev01_db_sch.zip From the document page 28, I know the PI5C3384 is a bi-directional bus switch. The PI5C3384's supply voltage is 5V(VCC_Buffer1 & VCC_Buffer2). So I think the output signals are in 5V logic level also, is that right?