P4080 RCW RGMII

[maxiang]

Can I configure Serdes of P4080 within RCW as 3.125G with RGMII ， not SGMII

[alexander_yakov]

RGMII is not serial protocol, so serdes (serializer/deserializer) block is not used for this protocol, RGMII interface is connected directly to Ethernet controller, not via SerDes. Please look RCW[EC1] and RCW[EC2] fields.

Have a great day,
Alexander
TIC

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[maxiang]

my problem is as follows:

First, let me introduce the interface of my board.

Frame Manager 1 dTSEC1 and USB1 Signal Multiplexing，and we choosed Frame Manager 1 dTSEC1 ,the PHY is 88E1111.

Besides, serdes lane Multiplexing，we choose 0x13;

the RCW is :

In this case , 2.5G RapidIO is ok and FM1 dtSEC1 is OK too.

But now,  we want config RapidIO to 3.125G ,so serdes lane Multiplexing，we choose 0x16 or 0x19;  at the same time , Frame Manager 1 dTSEC1 and USB1 Signal Multiplexing，and we still choosed Frame Manager 1 dTSEC1 ,the PHY is 88E1111.

The RCW is:

In this case , 3.125G RapidIO is ok, but the FM1 dtSEC1 is error, we can not communication with PC in uboot.

Could you help me to solve this problem,thank you very much.

[alexander_yakov]

If SGMII mode is selected in serdes configuration, but you want to use RGMII, than you have to power down the corresponding serdes lane, as suggested in Table 4-35, in the description of RCW[EC1] and RCW[EC2]:

If SGMII mode is to be used (with the
appropriate SerDes lane powered on in
SRDS_LPDn) for FM1-dTSEC1, then RGMII
mode must not be enabled in EC1.
However, if RGMII is to be used by FM1-
dTSEC1 and EC1 is set accordingly, then
SGMII mode must not be enabled for FM1-
dTSEC1 (and the corresponding SerDes
lane must be powered down in
SRDS_LPD_Bn if SGMII is selected for that
bank n in the SRDS_PRTCL setting).

[maxiang]

Is there a configuration which can use 3.125G RapidIO and 10GEC at the same time ？

[alexander_yakov]

Your question:

> Is there a configuration which can use 3.125G RapidIO and 10GEC at the same time ？

All available Serdes options are listed in Table 3-16. As far as I can see, SRIO 3.125 Ghz is available in configurations 0x16 and 0x19 (with two SGMII or one PCIe and one SGMII), and not available with 10GEC. For SRIO and 10GEC - - I do not see this option available.

> I have power down bank 2 and bank 3 of serdes，but RGMII still work uncorrectly. there no data output when I trid to ping PC.

Please specify, how exactly you have powered down banks 2 and 3

[liliang]

I have power down bank 2 and bank 3 of serdes，but RGMII still work uncorrectly. there no data output when I trid to ping PC.