pluto_hdl_adi/projects/ad_fmclidar1_ebz

AD_FMCLIDAR1_EBZ HDL reference design

Overview

The following design supports both Xilinx and Intel FPGA's. The AD_FMCLIDAR1_EBZ 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.

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 or system_project.tcl)

You can find a porting guide in the wiki.analog.com.

NOTE

The Arria10SOC carrier requires a hardware rework to function correctly. The rework connects FMC_A header pins directly to the FPGA so that they can be accessed by the fabric.

Changes required:

REMOVE: R575, R576, R621, R633, R612, R613

POPULATE: R574, R577, R620, R632, R610, R611

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.

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.

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:

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.

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

Known issues

The Lidar boards do not power up

Problem: The Lidar boards do not power up because the PG_C2M pull-up resistor value on the carrier (Arria 10) is too high.

Solution: On Arria 10 - place a 4k7 ohms resistor in parallel with R5517.

Note:

1. The PG_C2M can no longer be software controlled. As soon as there is an auxiliary 3V3 on the carrier, the Lidar platform receives the power up command.
2. This problem only affects Lidar Rev B.

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 community in EngineerZone.