USB-2-MDIO: MDIO clause 45, extended register access issue

Hello, 

I want to use USB-2-MDIO GUI with MSP-EXP430G2ET launchpad to access registers of a PHY. This PHY is not from Texas instrument. 

This PHY (marvell 88x5113) has MDIO/MDC access to his registers using indirect access specified by IEEE Clause 45.

please find below explanation from Marvell datasheet:

I should provide the PHY address, Device address and register address. But on the GUI there is nowhere to provide the device address

My question is : 

- is it possible to access to the extended registers using the GUI USB-2-MDIO ??  i know there is a field to choose extended register but my main concern is that I should provide device address. 

- if not, is there a way to use commands or script to do it ?  

This topic has be discussed here, but this was regarding a TI PHY, which is not my case. 

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1262102/usb-2-mdio-gui-support-for-changing-device-address-field-tlk10034?tisearch=e2e-sitesearch&keymatch=usb%25202%2520mdio%2520device%2520name%2520msp430flasher#

https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1271487/faq-extended-register-space-access-for-ethernet-phys?tisearch=e2e-sitesearch&keymatch=usb%2525252525202%252525252520mdio%252525252520device%252525252520adress%252525252520extended%252525252520register#

Please if you have any idea or material this would be helpful

Thank you !

NOTE: i had an idea:

Let say i want to read register 0xF845,    PHY address=b00000  (0x00)      , DEVICE address=b11111   (0x1f)

STEP 1:

I should access with not extended register , the mdio clause 22 described below

so in order to read the register I would:

1/ write to register 0x1f (my device address) value 0xF845 (my register address)

2/read register 0x1F

a read is op=10 and write op=01  instead of  the fist write I should use operation =00 that sets the address but unfortunately I don't have this choice using the GUI

STEP 2: 

I had the idea maybe I should send direct serial commands to the MSP-EXP430G2ET without interfacing with the GUI. With this manner I should find the correct serial command to send to the MSP-EXP430G2ET where the MSP-EXP430G2ET will be able to translate it to the wanted MDIO frame. (and set operation bits b00)

I first spied the serial command send by USB-2-MDIO, it looks like that: 

read extended register PHY 00, register f845  -->      00f845*/

read not extended register PHY 00, register f845  -->    00f845=/

write extended register PHY 00, register f845, value 0xa4 -->     00f84500a4*/

Unfortunately the serials commands are basics, it's still high level approach so is seems there is no way to control the exact MDIO command.