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Altera_Forum
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12 years ago

Cyclone IV AS and JTAG programming at different voltage levels

I have some questions regarding the programming of Cyclone IV devices as shown in figure 8-28 in the datasheet. In my case, the banks where all programming pins reside (1, 2, 5 and 6) are all 2.5V. ...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Thank you FvM and Aphraton for your quick answers and tips!

@ FvM

It is not a good idea indeed. According to the datasheet, EPCS devices have 10uA leakage current and 8pF input capacitance (+ trace load etc). This will probably result in asymmetry between the two LVDS lines and very poor signal quality. Beside this, are you aware of any physical damage to any of the devices when nCSO and ASDO connected to an AS device are also used as LVDS?