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Altera_Forum
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12 years ago

cyc4 JTAG AS config questions

I am using the EP4CGX30BF14 device with an EPCS16SI8N flash and a JTAG connector. I'm using Fig 8-29 from the handbook for my setup, so SFL and only one JTAG connector. I'm a bit confused on a couple...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

The configuration pins refers to the bank in which your configuration device lies - in your case bank 8. So, you need to set your MSEL pins for 2.5V AS mode (MSEL[2:0] = 011).

As for the other signals you refer to: CONF_DONE & nSTATUS are open drain outputs that report the configuration status. I recommend pulling these up to the voltage of the bank in which they reside - bank 3, 3.3V in your case - although they can be pulled up to a lower voltage if required.

The balance of those pins (except MSEL - see below) are all outputs which reside on dual purpose pins that you can chose what to do with, thus have no restrictions or impact on your MSEL strapping.

Finally, MSEL. This may well reside in bank 3 (powered to 3.3V in your case), but these should be tied to GND or VCCA (2.5V), as specified in the configuration guide. See page 8-8.

Regards,

Alex