Frederick,

Yes - your last problem (system getting stuck after bitstream) is caused by the 
wrong power sequencing. But as 1) you have 10338 working and 2) your board is 
tested w/o 10393 it should be working together eventually.

Andrey

---- On Tue, 13 Mar 2018 07:48:42 -0700 Frederick 
Gamache<frederick.gama...@gmail.com> wrote ---- 

Hello Andrey,

Normally I have a dc-dc converter chip on my pcb which translate 3.3V to 2.8V. 
The 3.3V source is provided by the cable attached to the 10393.


I'll wait to receive my chip today and will install it tomorrow. I'll see if 
things will get better with it.


Currently I'm using an external power supply to source the 2.8V voltage so I 
guess the timing for the power sequence is not ok.


Frederick


On Fri, Mar 9, 2018 at 5:51 PM, Elphel Support 
<support-list@support.elphel.com> wrote:
Fred,

Just to clarify: 10393 can drive up to ~1.0A, but there will be voltage drop on 
the cable (Elphel cables have thick power traces). Connector is rated 0.4A/pin. 
The sensor power is controlled by the script (same one that loads bitstream), 
power status/control is available over the sysfs interface.

You may also put a buffer on all signals from the sensor, FPGA has flexible 
means to compensate pin delays if needed after the buffer insertion.

Andrey

---- On Fri, 09 Mar 2018 14:26:50 -0800 Elphel 
Support<support-list@support.elphel.com> wrote ---- 

Frederick, you need to power you board either directly from the 10393 3.3V on 
the cable, or (if you board has other components that need more power than 
10393 can provide) use external power switch driven by the cable power.

The problem is that the cable goes directly to the FPGA port that should be 
powered _before_ any non-zero voltage appears on the FPGA pins. This is a 
feature of the FPGA.

Andrey

---- On Fri, 09 Mar 2018 13:47:51 -0800 Frederick Gamache 
<frederick.gama...@gmail.com> wrote ---- 

I use TeraTerm.

I receive something else than 0xffff, but it seam to be the same value for any 
register...


Maybe I should check my power on my sensor chip.


FPGA bitstream stalls, it doesn't initialize if I power on my sensor PCB.


Fred


On Fri, Mar 9, 2018 at 4:37 PM, Oleg <support-list@support.elphel.com> 
wrote:
Hi,
 
Question: does the software needs to reach the  34VL02 EEPROM at any point?
Because I don't have one on my own sensor board...

 

It should work fine without eeprom.


Did it read chip id? or is it 0xffff? Do you use minicom or putty or other 
terminal program?


Regards,
Oleg

 

 


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