ad9656_fmc: Update README

Signed-off-by: Stanca Pop <[email protected]>

Author: StancaPop

Diff for: projects/ad9656_fmc/README.md

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+# AD9656-FMC HDL Project
+
+- Evaluation board product page: [EVAL-AD9656](https://www.analog.com/eval-ad9656)
+- System documentation: https://wiki.analog.com/resources/eval/ad9656-125ebz
+- HDL project documentation: http://analogdevicesinc.github.io/hdl/projects/ad9656_fmc/index.html
+
+## Supported parts
+
+| Part name                               | Description                                      |
+|-----------------------------------------|--------------------------------------------------|
+| [AD9656](https://www.analog.com/ad9656) | 16-bit, 2Quad, 125 MSPS JESD204B 1.8 V Analog-to-Digital Converter |
+
+## Building the project
+
+Please enter the folder for the FPGA carrier you want to use and read the README.md.

Diff for: projects/ad9656_fmc/Readme.md

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+# AD9656-FMC/ZCU102 HDL Project
+
+## Building the project
+
+The parameters configurable through the `make` command, can be found below, as well as in the **system_project.tcl** file; it contains the default configuration.
+
+:warning: **When changing the default configuration, the timing_constr.xdc constraints should be updated as well!**
+
+```
+cd projects/ad9656_fmc/zcu102
+make
+```
+
+All of the RX link modes can be found in the [AD9656 data sheet](https://www.analog.com/media/en/technical-documentation/data-sheets/AD9656.pdf). We offer support for only a few of them.
+
+If other configurations are desired, then the parameters from the HDL project (see below) need to be changed, as well as the No-OS project configurations.
+
+The overwritable parameters from the environment are:
+
+- JESD_MODE - link layer encoder mode used; 
+  - 8B10B - 8b10b link layer defined in JESD204B, uses ADI IP as Physical layer
+- RX_JESD_M - RX number of converters per link, only 4 is supported
+- RX_JESD_L - RX number of lanes per link, default is 4 (Options: 1/2/4)
+- RX_JESD_S - RX number of samples per converter per frame, only 1 is supported
+- RX_JESD_NP - RX number of bits per sample, only 16 is supported
+- RX_SAMPLES_PER_CHANNEL - RX number of samples per channel, default is 2 (Computed as: L * 32 / (M * N))
+
+Corresponding No-OS project: [ad9656_fmc](https://github.com/analogdevicesinc/no-OS/tree/main/projects/ad9656_fmc)