AM2432: MII connectivity

IgorR

Part Number: AM2432

I need to connect PHY chip (LAN8740A-EN) using MII interface to AM2432 but I am not sure if I am using right balls on AM2432.

I think that I have following two options to connect AM2432 to the PHY chip:

OPTION 1

BALL	SIGNAL	PHY CHIP PIN
Y6	MIO0_MDC	16 (MDIO)
AA6	MDIO0_MDIO	17 (MDC)
Y7	MII0_RXD0	11 (RXD0/MODE0)
U8	MII0_RXD1	10 (RXD1/MODE1)
W8	MII0_RXD2	9 (RXD2/NPME/RMIISEL)
V8	MII0_RXD3	8 (RXD3/PHYAD2)
Y8	MII0_RXDV	26 (RXDV)
V13	MII0_RXER	13 (RXER/RXD4/PHYAD0)
AA7	MII_MR0_CLK	7 (RXCLK/PHYAD1)
AA8	MII0_TXD0	22 (TXD0)
U9	MII0_TXD1	23 (TXD1)
W9	MII0_TXD2	24 (TXD2)
AA9	MII0_TXD3	25 (TXD3)
Y9	MII0_TXEN	21 (TXEN)
V9	MII_MT0_CLK	20 (TXCLK)

OPTION 2

BALL	SIGNAL	PHY CHIP PIN
Y6	MIO0_MDC	16 (MDIO)
AA6	MDIO0_MDIO	17 (MDC)
W11	MII1_RXD0	11 (RXD0/MODE0)
V11	MII1_RXD1	10 (RXD1/MODE1)
AA12	MII1_RXD2	9 (RXD2/NPME/RMIISEL)
Y12	MII1_RXD3	8 (RXD3/PHYAD2)
W12	MII1_RXDV	26 (RXDV)
AA13	MII1_RXER	13 (RXER/RXD4/PHYAD0)
U11	MII_MR1_CLK	7 (RXCLK/PHYAD1)
AA10	MII1_TXD0	22 (TXD0)
V10	MII1_TXD1	23 (TXD1)
U10	MII1_TXD2	24 (TXD2)
AA11	MII1_TXD3	25 (TXD3)
Y11	MII1_TXEN	21 (TXEN)
Y10	MII_MT1_CLK	20 (TXCLK)

I need to know if the above selections are correct. In addition I was not able to figure out how to connect the CRS and COL signals. These are pin 14 (CRS) and pin 15 (COL/CRS_DV/MODE2) on the LAN8740A-EN Ethernet PHY chip we intend to use. Can you let me know which balls on AM2432 to use for those two signals.

over 3 years ago

0 Prasad Jondhale over 3 years ago

TI__Mastermind 27743 points

Hi,

I have assigned this thread to our HW expert. Please expect reply from him shortly. If you don't hear anything by Monday, please feel free to ping again.

Regards,

Prasad

0 IgorR over 3 years ago in reply to Prasad Jondhale

Prodigy 85 points

Hi Prasad,

I have not heard anything yet.

0 Fleenor over 3 years ago in reply to IgorR

TI__Mastermind 24613 points

Hello Igor,

Thank you for your patience.

Have you done any system use case analysis with the SysConfig-PinMux Tool? Link provided below for quick access.

https://dev.ti.com/sysconfig/#/config/?args=--device%20AM243x_ALV_beta%20--part%20ALV%20--package%20ALV%20--theme%20light

The MII pinmux options you have given are for the PRU_ICSSG1_MII_G_RT and are valid options. There are also valid pinmux options using PRU_ICSSG0_MII_G_RT.

Regardless of which MII interface pinmux option is used, there are assoicated MIIn_CRS and MIIn_COL signals that should be connected to pin 14 (CRS) and pin 15 (COL/CRS_DV/MODE2) on the LAN8740A-EN Ethernet PHY chip respectively. Screenshots from the SysConfig-PinMux Tool implementation of PRU_ICSSG0_MII_G_RT are provided below for reference.

Best Regards,

Zackary Fleenor

0 IgorR over 3 years ago in reply to Fleenor

Prodigy 85 points

Hi Zackary,

We have now decided to change our Ethernet PHY chip from LAN8740A-EN to TI part DP83826ERHB. I think that everything you mentioned above still applies.

I am not sure what to do with MII0_RXLINK signal. Is this signal used with DP83826ERHB? If so can you provide guidance how to connect to DP83826ERHB.

Thanks

0 Fleenor over 3 years ago in reply to IgorR

TI__Mastermind 24613 points

RXLINK is an optional signal provided via the ICSS MII interface for MDIO LINK status and may not be required for this use case.

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AM2432: MII connectivity