Constraints for microZed with breakout carrier card

Hi,

I am using microzed board along with breakout carrier card. I have designed an IP that has been tested on Zedboard and it is working fine. Now, I have desgned the same IP for microzed board.

I need to take output from any one of the CON1/CON2 pins in the breakout carrier card but unfortunately I am not getting any output from the pins. I am suspecting some mistake in the constraint file.

My constraint file is:

set_property IOSTANDARD LVCMOS33 [get_ports a_out]

set_property PACKAGE_PIN Y16 [get_ports a_out];

This is for getting output at CON1- Pin 19.

Please help me suggest whether I have written the constraints correctly.

Thanx,

Priya

0 jafoste4 over 6 years ago

Hello Priya,
Looking at the Master Constraint file for MicroZed, Pin Y16 is supposed to have an IOSTANDARD = LVCMOS18, so not 3.3V as you defined above.
--Josh
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0 100priya over 6 years ago in reply to jafoste4

Thank you for your suggestion. It worked!

After changing 3.3 to1.8, I got some output from the pin. I checked it on oscilloscope. Now I am facing another problem that the output signal is attenuated to 0.6V. I have to apply the output to a sound card via RS 485 interface. It seems that the strength of the signal is too low to be detected by the sound card/ RS 485. Could you please suggest how do I increase the strength of the signal internally in the microzed board. I hope to get atleast 1.5V. When I used the same IP in zedboard, I got 3V signal from the pin.

Alternatively, if you could suggest any pins that have IOSTANDARD 3.3V, I may be able to solve this issue.
Thank you
Priya
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0 jafoste4 over 6 years ago

Hello Priya,
Refer to the Master constraint file here for available pins with a 3.3V IO Standard.
http://zedboard.org/support/documentation/1519
--Josh
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0 100priya over 6 years ago in reply to jafoste4

Hi Josh,
I referred to this file earlier but all the CON1 AND CON2 pins have IOSTANDARD 1.8V by default. It is mentioned that we can change it to 3.3V or 2.5V by adjusting the Vadj jumper (J18) settings. But there is no VAdj jumper on the microzed board. I need atleast 2 pins on CON1/CON2 which have 3.3V.
Please help.

Thanx
Priya
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0 jafoste4 over 6 years ago

Hell Priya,
VADJ is set by JP2 on the MicroZed Breakout Carrier Card. Please refer to the schematic . I believe you want to set it to position 1-2 for 3.3V.
--Josh
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0 100priya over 6 years ago in reply to jafoste4

I already tried that. I set the JP2 jumper to 3.3V and made the necessary changes in the constraint file as well. This is what i was doing in the beginning when you suggested to change the IOSTANDARD to 1.8V. There is an output if i set constraint file (IOSTANDARD) as well as JP2 to 1.8V but no output at 2.5V or 3.3V.

Even the VCCIO pins viz. CON1-53,54 ,CON2-49,50 have a constant level of 0.8V (checked on oscilloscope as well as multimeter) no matter what the jumper setting is. I think the jumper is not working. What would you suggest?

Thanx
Priya
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0 jafoste4 over 6 years ago

Hello Priya,
Why don't you just measure VCCIO using a multimeter as you toggle through each jumper posiition?
--Josh
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0 100priya over 6 years ago in reply to jafoste4

Hi Josh,
I tried what you suggested. The VCCIO pins viz. CON1- 53,54 and CON2-49,50 have a constant voltage of 0.8V. There is no effect of toggling the jumper. The voltage remains 0.8V for all the 3 jumper positions.
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