I'm going thru Zedboard_CTT_v2013_2_120807 tutorial using Vivado2013.4 and I'm stuck at 5.4 - Controlling LED's and Switches in Linux example.
I built a design and ran thru Synthesis and Implementations successfully, but failed to generate bitstream with 2 errors:
1 - [Drc 23-20] Rule violation (NSTD-1) Unspecified I/O Standard - 21 out of 151 logical ports use I/O standard (IOSTANDARD) value 'DEFAULT', instead of a user assigned specific value...
2 - [Drc 23-20] Rule violation (UCIO-1) Unconstrained Logical Port - 21 out of 151 logical ports have no user assigned specific location constraint (LOC).
Am I missing something?
I googled the topic and looks like I have to add constraints like it mentioned here: http://zedboard.org/content/ise-146-missing-leds8bits-btns5bits-sws8bits
But... First, why it is not mentioned in a tutorial? Second, looks like LED's and Buttons conneted to 3.3V and Switches can be selected by VADJ on Zedboard(on my 3V3 jumper not even populated, so its either 1.8V or 2.5V) and in a post above it suggested to specify 3.3 for all pins. So, I got a little confused and really don't want to damage the board.
Also, in CCT offset address for leds_8bits, btns_5bit and switched_8bit differ from "Basic Vivado IPI Design" example. Why? Which one correct and how/where I can find out the correct offsets without asking here?
Can anybody clarify situation. Thank you in advance.
