Add support for Generic TDD Engine (TDDN)

[podgori]

Description

Adding support for TDDN:

• Added tddn.py in library
• Added pluto_tddn.py example script
• Updated the documentation to include the TDDN

Type of change

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

How has this been tested?

The example script was tested on Pluto in Phaser mode. The TDD configuration and functionality from pluto_tddn.py example was validated and tested with an oscilloscope.

Documentation

TDDN wiki page: https://wiki.analog.com/resources/fpga/docs/axi_tdd

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have signed off all commits and they contain "Signed-off by: "
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[github-actions[bot]]

Generated documentation for this PR is available at Link

[github-actions[bot]]

Unit Test Results

1 424 tests  ±0      255 :heavy_check_mark: ±0   9m 13s :stopwatch: ±0s        1 suites ±0   1 169 :zzz: ±0         1 files   ±0          0 :x: ±0 

Results for commit c097476c. ± Comparison against base commit 89d94fd8.

[github-actions[bot]]

Unit Test Results

1 436 tests  +12      255 :heavy_check_mark: ±  0   9m 14s :stopwatch: -1s        1 suites ±  0   1 181 :zzz: +12         1 files   ±  0          0 :x: ±  0 

Results for commit 46b54506. ± Comparison against base commit 89d94fd8.

:recycle: This comment has been updated with latest results.

[tfcollins]

@podgori how is this different than the existing TDD class?

[podgori]

This class is specific to the Generic TDD engine, the new scalable and standalone TDD IP, which aims to reduce the naming confusion around the existing TDD core built for AD9361, as well as expanding its number of output channels for systems which require more than six controlling signals (up to 32 channels). As such:

• its properties match the new TDD driver attributes
• uses a channel class with common properties per channel
• uses indexed channels

[tfcollins]

Can we replace the existing design (adi.tdd) with this one?

[podgori]

Can we replace the existing design (adi.tdd) with this one?

As discussed, we can leave these 2 classes separate for now.