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Title
# general
a

Adithya Sunil

01/26/2022, 1:38 AM
Hi everyone, I am working on putting an analog design on the MPW-5 shuttle and while placing my design on the user_analog_project_wrapper and connecting pins, I am having this doubt as to what the structure of the pins are. I am using the
gpio_analog
,
gpio_noesd
,
io_analog
pins for my design. It would be great if someone who is aware of it can share the structure of these pins and the ESD that is present so I can design buffers and measurement circuits that can work effectively with the load resistance and capacitance exerted by the pins and ESD. Thanks!
a

Arman Avetisyan

01/26/2022, 6:17 AM
You can read the analog user projects verilog for purpose of each pin. Regarding the structure of caravel/caravan you can also take a look at caravels verilog as it contains all components + connections. gpio components are installed by openpdks and are properly documented by skywater docs
r

Rana Muhammad Shahid Jamil

01/26/2022, 9:56 AM
gpio_analog
has a 150 Ohm resistance in series to provide some ESD protection.
gpio_noesd
doesnot have this resistor.
io_analog
are barewire metal pads for highspeed/high voltage applications
👍 2
l

Luis Henrique Rodovalho

01/26/2022, 1:53 PM
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Adithya Sunil

01/27/2022, 8:38 AM
Thank you @User @User and @User.
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