7. PHY Dashboard¶

Note

The Ethernet Phy Dashboard is a debugging tool. It is not intended to be used for every day work flow.

Two primary things are needed to work with the PHY Dashboard.

The manufacturer’s data sheet of the PHY. This is needed to know the function of the registers and the format of their contents. These data sheets are usually confidential and require and NDA (Non Disclosure Agreement) with the manufacturer.
The address of the PHY in the device and protocol used. If your device is not listed below, please contact support@intrepidcs.com.

Device	Port	PHY Address	Protocol
RAD-SuperMoon/Moon2	1000BASE-T1	0x06	Clause45
RAD-Moon Duo	AE1	0x02	Clause45
	AE2	0x01	Clause45
	ETH1	0x07	Clause22
	ETH2	0x06	Clause22
RAD-Pluto	AE1	0x04	Clause22
	AE2	0x05
	AE3	0x06
	AE4	0x07
	1000BASE-T	0x01
RAD-Jupiter PHYs internal to 88Q5050 Access through Switch Address: 0x01	AE1	0x01	Clause45
	AE2	0x02
	AE3	0x03
	AE4	0x04
	AE5	0x05
RAD-Jupiter External PHYs	AE6	0x02	Clause45
	ETH1	0x01	Clause22
	ETH2	0x00	Clause22

7.1. Opening the PHY Dashboard¶

The PHY Dashboard can be opened from the Embedded Tools menu in Vehicle Spy (shown below)

7.2. Register Access¶

MDIO protocol

Most Ethernet Phys communicate using MDIO protocol (Management Data Input/Output). Each frame is 32 bits. There are 2 start bits, a 2 bit operation code, 5 bit phy address, 5 bit register address, 2 bit turn around delay, and 16 bit data.

7.2.1. Clause 22¶

The initial protocol, IEEE 802.3 Clause 22, was designed to read or write 32 registers within 32 devices. Each read/write is done in one operation.

Phy Address 5 bits (0 – 31 decimal)
Register address 5 bits (0 – 31 decimal) or (0 – 1F hex)
Data 16 bits

Page Register

Some Ethernet Phy manufacturers added a page register to allow for more registers in Clause 22. The page can be 0 – 255 decimal. If the Phy does not support pages, then page will be ignored. When using pages, reads and writes can no longer be performed in one operation. Instead you must write to the page register and then before any other process changes the page, you can read or write the destination register. If another process were to change the page register before you finish, the result will be an read the wrong register or an write to wrong register which may cause the Phy to stop working.

7.2.2. Clause 45¶

As Ethernet Phys became more complicated and supported different speeds and connections, IEEE 802.3 Clause 45 was added. Because the Register Address is now 16 bits, each read/write takes at 2 operations. The first operation is always writing the Register Address that you want to use in the next operation. The second is the actual read or write. There is also a special read that increments the address after each read which allows you to write a starting address and then read a whole block of registers.

Port 5 bits (this is equivalent to the Phy Address)
Device 5 bits (this is similar to the page)
Register address 16 bits (this allows 65536 registers in each device)
Data 16 bits

7.3. VSpy Operation¶

Add – use this button to add MDIO operations. Ctrl-S saves screen contents to VS3 file.
Delete – deletes the currently selected item or item.
Delete All – deletes all operations
Read One Time – performs all reads from the list once. No writes are performed.
Write One Time – performs all writes from the list once. No reads are performed.
All One Time – performs every item in the list once.
Send Selected – performs only the selected item or items once.
Start Monitor – performs all reads once per second.
Stops Monitor – stops the monitor operation.

Note: all values in Hex except Phy Address/Port

7.4. Examples¶

7.4.1. Clause 22 Example:¶

Line 1 writes soft reset to phy address 16, using Clause 22
Line 2 reads Phy ID Reg1 from phy address 16 using Clause 22
Line 3 reads Phy ID Reg2 from phy address 16 using Clause 22

7.4.2. Clause 45 Example:¶

Line 1 writes soft reset of PCS to Port 16, Device 3 using Clause 45
Line 2 reads PCS ID Reg1 from Port 16, Device 3 using Clause 45
Line 3 reads PCS ID Reg2 from Port 16, Device 3 using Clause 45

7.5. Common Clause 22 Registers¶

Clasuse 22 Registers	Bits	Function/Status
Control Register (Register 0)	15	reset
	14	loopback
	12	auto negotiate
	11	power down
	10	isolate
	9	renegotiate
	8	duplex
	7	collision test
	6/13	speed	10=1000mbps
			01=100mbps
			00=10mbps
Status Register (Register 1)	5	Auto Negotiation Complete
	4	Remote Fault
	3	Auto Negotiation Capability
	2	Link Status
	1	Jabber Detect
	0	Extended Capability
Phy ID Reg 1 (Register 2)	15:0	OUI MSB
PHY ID Reg 2 (Register 1)	15:10	OUI LSB
	9:4	Model Number
	3:0	Revision Number

7.6. Common Clause 45 Registers¶

7.6.1. PMA/PMD Registers¶

	Device	Register	Bits	Function/Status
Control Register	1	0	15	reset
			11	power down
			6/13	speed	10=1000mbps
					01=100mbps
					00=10mbps
Device ID Reg 1	1	2	15:0	Auto Negotiation Complete
Device ID Reg 2	1	3	15:10	OUI LSB
			9:4	Model Number
			3:0	Revision Number

7.6.2. PCS Registers¶

	Device	Register	Bits	Function/Status
Control Register	3	0	15	reset
			14	loopback
			11	power down
			6/13	speed	10=1000mbps
					01=100mbps
					00=10mbps
Device ID Reg 1	3	2	15:0	Auto Negotiation Complete
Device ID Reg 2	3	3	15:10	OUI LSB
			9:4	Model Number
			3:0	Revision Number

7.7. Glossary¶

IEEE: Institute of Electrical and Electronics Engineers
MAC: Media Access Control
MBPS: Mega Bits Per Second
MDC: Management Data Clock
MDIO: Management Data Input/Output
OSI: Open Systems Interconnection
OUI: Organizationally unique ID
PCS: Physical Coding Sublayer
PHY: Physical layer of the OSI model
PMA: Physical Medium Attachment
PMD: Physical Medium Dependent