CN0506 HDL project

Overview

The CN0506 is a dual channel, low latency, low power Ethernet PHY card supporting speeds of 10/100/1000 Mbps for Industrial Ethernet applications. The circuit consists of two indivudual, independent 10/100/1000Mb ADIN1300 PHYs, each with an energy efficient Ethernet (EEE) physical layer device (PHY) core with all associated common analog circuitry, input and output clock buffering, management interface, subsystem registers, MAC interface and control logic.

The design is powered from the host field programmable gate array (FPGA) mezzanine card (FMC) development board, eliminating the need for an external power supply. A software programmable clock enables media independent interface (MII), reduced MII (RMII), and reduced Gigabit MII (RGMII) MAC interface modes. RJ45 ports with integrated magnetics keep the solution as compact as possible. The solution supports cable lengths up to 150 meters at gigabit speeds and up to 180 meters at 100 Mbps or 10 Mbps.

Supported boards

• EVAL-CN0506

Supported devices

• ADIN1300

• LTC4316

• LTC3502

Supported carriers

• A10SOC on FMC_A HPC *

• ZCU102 on FMC HPC1

• ZC706 on FMC LPC

• ZedBoard on FMC slot

Legend

• * only the MII interface is supported to be connected to A10SoC

Block design

The reference design uses Util MII to RMII converter to interface the MII option of the CN0506’s ethernet PHYs and Xilinx’s GMII to RGMII converter for the RGMII option of the kit with Xilinx’s Zynq7000 or ZynqMP SoC implementations.

Block diagram

The data path and clock domains for all the three MII interface types are depicted in the below diagrams:

CN0506_MII interface

CN0506_RGMII interface

CN0506_RMII interface

Resistor-based setup

MAC interface selection	MACIF_SEL1(PHY A/PHY B)	MACIF_SEL0(PHY A/PHY B)
RGMII RXC/TXC 2ns delay	R12/R78	R9/R75
RGMII RXC/TXC 2ns delay	R11/R77	R9/R75
MII	R17/R78	R8/R74
RMII	R11/R77	R8/R74

MDI-related resistor-based setup

Configuration	MODE	R_LO	R_HI
Manual MDI	MODE_1	10k	Open
Manual MDIX	MODE_2	10k	56k
Auto MDIX - Prefer MDIX	MODE_3	56k	10k
Auto MDIX - Prefer MDI	MODE_4	Open	10k

CPU/Memory interconnects addresses

The addresses are dependent on the architecture of the FPGA, having an offset added to the base address from HDL(see more at HDL Architecture).

Instance	Address
axi_iic_main *	0x4160_0000
axi_sysid_0	0x4500_0000
axi_hdmi_clkgen *	0x7900_0000
axi_hdmi_dma *	0x4300_0000
axi_hdmi_core *	0x70e0_0000
axi_spdif_tx_core *	0x75c0_0000
axi_i2s_adi **	0x7760_0000
axi_iic_fmc **	0x4162_0000

Legend

• * instantiated only for Zed and ZC706 carriers

• ** instantiated only for Zed carrier

GPIO

The Software GPIO number is calculated as follows:

• Zynq-7000: if PS7 EMIOs are used, then offset is 54

• ZynqMP: if PS8 EMIOs are used, then offset is 78

GPIO signal	Direction	HDL GPIO EMIO	Software GPIO
	(from FPGA view)		Zynq-7000/ZynqMP
link_st_a	IN	35	89
link_st_b	IN	34	88
int_n_a	IN	33	87
int_n_b	IN	32	86
gpio_bd[31:0] *	INOUT	31:0	85:54
gpio_bd[14:0] **	INOUT	14:0	68:54
gpio_bd_i[20:8] ***	IN	20:8	98:86
gpio_bd_o[7:0] ***	OUT	7:0	85:78

• Intel FPGAs - Altera Arria 10 SoC

GPIO signal	Direction	HDL GPIO EMIO
	(from FPGA view)	Arria10SoC
link_st_a	IN	35
link_st_b	IN	34
mii_crs_a	IN	33
mii_crs_b	IN	32
gpio_bd_i[11:4]	IN	11:4
gpio_bd_o	OUT	3:0

Legend

• * instantiated only for Zed carrier

• ** instantiated only for ZC706 carrier

• *** instantiated only for ZCU102 carrier

Interrupts

Below are the Programmable Logic interrupts used in this project.

Instance name	HDL	Linux Zynq	Actual Zynq
axi_hdmi_dma/irq*	15	59	91
axi_iic_main/iic2intc_irpt*	14	58	90
axi_iic_fmc/iic2intc_irpt*	11	55	87

Legend

• * instantiated only for Zed and ZC706 carriers

• ** instantiated only for Zed carrier

Building the HDL project

The design is built upon ADI’s generic HDL reference design framework. ADI distributes the bit/elf files of these projects as part of the ADI Kuiper Linux. If you want to build the sources, ADI makes them available on the HDL repository. To get the source you must clone the HDL repository, and then build the project as follows:.

Linux/Cygwin/WSL

user@analog:~$ cd hdl/projects/cn0506/zed
user@analog:~/hdl/projects/cn0506/zed$ make INTF_CFG=MII

The result of the build, if parameters were used, will be in a folder named by the configuration used:

if the following command was run

make INTF_CFG=MII

then the folder name will be:

INTF_CFGMII

A more comprehensive build guide can be found in the Build an HDL project user guide.

Resources

Hardware related

• Product datasheet: CN0506

• ADIN1300 datasheet: ADIN1300

HDL related

• CN0506 HDL project source code

IP name	Source code link	Documentation link
AXI_CLKGEN *	library/axi_clkgen	here
AXI_HDMI_TX *	library/axi_hdmi_tx	here
AXI_I2S_ADI **	library/axi_i2s_adi	—
AXI_SYSID	library/axi_sysid	here
SYSID_ROM	library/sysid_rom	here
AXI_SDDIF_TX *	library/axi_spdif_tx	—
UTIL_I2C_MIXER **	library/util_i2c_mixer	—
UTIL_MII_TO_RMII ***	library/util_mii_to_rmii	here

Legend

• * instantiated only for Zed and ZC706 carriers

• ** instantiated only for Zed carrier

• *** instantiated only for Zed, ZC706 and ZCU102 carriers

Software related

• CN0506 MII dtsi source code (arm32)

• CN0506 RGMII dtsi source code (arm32)

• CN0506 RMII dtsi source code (arm32)

• CN0506 MII dtsi source code (arm64)

• CN0506 RGMII dtsi source code (arm64)

• CN0506 RMII dtsi source code (arm64)

• CN0506 MII - A10SOC dts source code (arm32)

• CN0506 MII - ZCU102 dts source code (arm64)

• CN0506 RGMII - ZCU102 dts source code (arm64)

• CN0506 RMII - ZCU102 dts source code (arm64)

• CN0506 MII - ZC706 dts source code (arm32)

• CN0506 RGMII - ZC706 dts source code (arm32)

• CN0506 RMII - ZC706 dts source code (arm32)

• CN0506 MII - ZED dts source code (arm32)

• CN0506 RGMII - ZED dts source code (arm32)

• CN0506 RMII - ZED dts source code (arm32)

• ADIN1300 driver docs

More information

• ADI HDL User guide

Support

Analog Devices, Inc. will provide limited online support for anyone using the reference design with ADI components via the EngineerZone FPGA reference designs forum.

For questions regarding the ADI Linux device drivers, device trees, etc. from our Linux GitHub repository, the team will offer support on the EngineerZone Linux software drivers forum.

For questions concerning the ADI No-OS drivers, from our No-OS GitHub repository, the team will offer support on the EngineerZone microcontroller No-OS drivers forum.

It should be noted, that the older the tools’ versions and release branches are, the lower the chances to receive support from ADI engineers.