- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Good afternoon,
I have my output pins during the device initialization phase which has a level of 1.2V (3.3V I/O power Bank) and I have 10K pull down on my output signal (LVCMOS 3.3V). I don't know why I have this voltage level (I was expecting 0V).
I need to know what is the I/O state during Device Initialization (before user mode and after configuration time) ?
It is possible to change the I/O state during device initialization ?
Link Copied
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello David,
Hope you are doing well.
I need to know what is the I/O state during Device Initialization (before user mode and after configuration time) ?
There are four stages in device operation: Power Up, Configuration, Initialization and User Mode.
During initialization mode, internal logic and I/O registers are initialized and I/O buffers are enabled. When initialization is finished, the INIT_DONE pin is released and pulled high by an external pull-up resistor.
It is possible to change the I/O state during device initialization ?
No. The I/O state can only be changed in User Mode.
I hope this answer helps.
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello,
Thanks for the reply.
I need more information about the following point:
During initialization mode, internal logic and I/O registers are initialized and I/O buffers are enabled.
What is the behavior of I/O pins of the FPGA during this phase ('Z' or wealky pull-up or something different) ?
Thanks
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hello Ben,
You can refer on this document: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/cfg/cfg_cf51001.pdf (Page 1 Figure 1). The figure gives information in details about I/O state of each phases.
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page