Connecting two Marvell PHY devices to one Cyclone III FPGA

[Altera_Forum]

Hi, 

 - We need to send data from one Cyclone III development board to two receivers. One of these receivers is a displaying panel while the other one is sent to another cyclone III development board (that is connected to a displaying panel too).  - This is implemented as shown in the attached image, by branching the required signals like mdio, mdc,data,.. .  When assigning the mdio to two pins one of them is D2 in bank 1 and the other one is the already assigned pin in cyclone III development board (AB2) "PHY not found in PHY profile" error occurred. If changing the pin location to IOBANK_1 , the connection is successfully established & there is no error detected.  Kindly note that this error occurred without connecting the second board?  Can any one help us.  Thanks & Regards

[Altera_Forum]

Why do you use two extra pins? Both PHYs can be connected to the same MDC/MDIO lines. 

Anyway I think your problem is with ORing the mdio_in signals. A non driven mdio line will pull to a high level, then the OR gate will always result in receiving all ones. Replace OR with AND.

[Altera_Forum]

--- Quote Start ---  Why do you use two extra pins? Both PHYs can be connected to the same MDC/MDIO lines. Anyway I think your problem is with ORing the mdio_in signals. A non driven mdio line will pull to a high level, then the OR gate will always result in receiving all ones. Replace OR with AND.  --- Quote End ---     Thank you very much for your reply :)  1- We use extra pins to connect to another PHY that is not existing in Cyclone III development board. These pins are connected to the second designed board via the HSMC connector  2- Regarding your suggestion we are going to replace the Or gate with an AND one.  Kind Regards