ad_fmclidar1_ebz: Add documentation

Author: Istvan Csomortani

projects/ad_fmclidar1_ebz/README.md

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+
+# AD_FMCLIDAR1_EBZ HDL reference design
+
+## Overview
+
+The following design supports both Xilinx and Intel FPGA's. The [AD_FMCLIDAR1_EBZ](https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/AD-FMCLIDAR1-EBZ.html)
+prototyping system connects to the FPGA carrier board through a FMC (FPGA Mezzanine Cad)
+high pin count connector.  
+
+Detailed user guide of the prototyping platform can be found [here](https://wiki.analog.com/resources/eval/user-guides/ad-fmclidar1-ebz).
+
+Currently supported carriers:
+
+|  Carrier name | FMC connector |
+| ------------- | ------------- |
+|  ZC706        |   FMC_HPC     |
+|  ZCU102       |   HPC0        |
+|  Arria10SOC   |   FMCA_HPC    |
+
+The design is easily portable to any Xilinx or Intel FPGA carrier board, which
+has an FMC HPC connector, and have all the required connections. (See more info
+in [system_constr.xdc](./zc706/system_constr.xdc) or [system_project.tcl](./a10soc/system_project.tcl))
+
+You can find a porting guide in the [wiki.analog.com](https://wiki.analog.com/resources/fpga/docs/hdl/porting_project_quick_start_guide).
+
+### Directory Structure
+
+| Directory | Description |
+| --------- | ----------- |
+| common    | Common verilog and block design Tcl files |
+| zc706     | ZC706 specific source files |
+| zcu102    | ZCU102 specific source files |
+| a10soc    | Arria10SOC specific source files |
+
+More information about the directory structure of the HDL repository can be found [here](https://wiki.analog.com/resources/fpga/docs/git).
+
+## Build instructions
+
+The project is using GNU Make for build and bitstream generation. Change your directory
+to your targeted carrier and run **make**.
+
+More information about how to build HDL projects can be found [here](http://wiki.analog.com/resources/fpga/docs/build).
+
+## Architecture
+
+The main scope of the HDL design is to provide all the required digital interfaces
+for the data acquisition board of the prototyping system.
+
+The following block diagram presents the simplified system architecture: 
+
+![HDL Block Diagram](./doc/img/hdl_lidar.png)
+
+### AXI_LASER_DRIVER IP
+
+The axi_laser_driver IP is responsible to generate a narrow pulse for the laser
+driver circuit, to control the TIA channel selection on the analog front end (AFE)
+board, and to synchronize the data acquisition to the generated pulses.
+
+More information about the IP can be found [here](https://wiki.analog.com/resources/fpga/docs/axi_laser_driver).
+
+### Control interfaces
+
+| Name | Type | Details |
+| ---- | ---- | ------- |
+| adc_fd*                     | GPIO        | Monitors the AD9094 Fast detect output lines | 
+| adc_pwdn                    | GPIO        | Controls the AD9094 Power-Down input line | 
+| spi_adc_*                   | 4-wire SPI  | AD9094 configuration interface | 
+| spi_vco_*                   | 3-wire SPI  | ADF436-7 configuration interface | 
+| spi_clkgen_*                | 4-wire SPI  | AD9528 configuration interface | 
+| laser_driver_p\n            | LVDS output | It controls the laser driver circuit, it is generated by the axi_laser_driver IP instance | 
+| laser_gpio[13:0]            | GPIO        | Unused GPIO line on the lase board |
+| tia_chsel[7:0]              | CMOS output | TIA channel selection lines, it is controlled by the axi_laser_driver instance |
+| afe_dac_sda\scl\load\clr_n  | I2C/GPIO    | AD5627 configuration interface |
+| rx_ref_clk_p\n              | LVDS        | JESD204B reference clock for the high-speed gigabit transceivers; runs at 250MHz |
+| rx_device_clk_p\n           | LVDS        | JESD204B device clock for the transport layer and additional data processing; runs at 250MHz |
+| rx_data_p\n[3:0]            | CML         | JESD204B high-speed serial lanes; runs at 10Gbps |
+| rx_sync_p\n[1:0]            | LVDS        | JESD204B SYNC signals for interface synchronization |
+| rx_sysref_p\n               | LVDS        | JESD204B SYSREF signal for deterministic latency |
+
+### JESD204B interface
+
+The JESD204B interface runs in Subclass 1 mode to ensure the deterministic latency 
+of the link. The following tables are summarizing the JESD204B important configuration 
+parameter and attributes.
+
+| Parameter name | Abbreviation |Value |
+| -------------- | ------------ | ---- |
+| Number of lanes  | L | 4 | 
+| Number of converter | M | 4 |
+| Converter resolution | NP | 8 |
+| Total number of Bits per Sample| NP | 8 |
+| Samples per frame | S | 1 |
+| Octets per frame | F | 1 |
+| Frames per Multiframe | K | 32 |
+| Number of control bits | CS | 0 |
+
+| Rates and Clocks | Value | 
+| ---------------- | ----- |
+| Sample rate | 1GSPS |
+| Lane rate | 10Gbps |
+| GT reference clock | 250MHz |
+| Device clock | 250 MHz | 
+
+## References
+
++ AD-FMCLIDAR1-EBZ product page: https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/AD-FMCLIDAR1-EBZ.html
++ AD-FMCLIDAR1-EBZ user guide: https://wiki.analog.com/resources/eval/user-guides/ad-fmclidar1-ebz
++ ADI's FPGA Reference Designs HDL User Guide: https://wiki.analog.com/resources/fpga/docs/hdl
++ ADI's JESD204B Interface Framework: https://wiki.analog.com/resources/fpga/peripherals/jesd204
++ axi_laser_driver IP Core: https://wiki.analog.com/resources/fpga/docs/axi_laser_driver
+
+## Support
+
+For technical support please visit [FPGA Referece Designs](https://ez.analog.com/fpga/) community in EngineerZone.
+