MPC 8260/70 MCC SI Clocking and TSA Sync

MPC 8260/70 MCC SI Clocking and TSA Sync

[Manish Joshi]

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Hi,
 
I am trying to bring up MCC (Multi Channel Communication controller) on MPC8270 board for T1/E1.
The overall configuration looks fine since I am able to have a communication properly if I do a T1 Cross over Loopback and tx/rx HDLC data.
The things do not work smoothly if I connect my T1 line with an external device and start HDLC.
I am seeing 'NO' (Rx Non-Octet Alligned Frame) errors in my rx buffers. Sometimes I also see Rx abort errors.
I do not see this issue on the tx side i.e the external device does not report any of these when I tx HDLC data to it.
 
Does anybody have any experience dealing with this ? 
 
As far as clocking and sync with TSA is concerned, I have just configured 
CMXSI2CR register with 0x00 ( I have only TDM2A driven by CLK1) and nothing else. 

Do I need to do something more for clocking etc? Also I am doing this before SI initialisation.

I will also try doing it just after TDM init and see if it helps.

Please help.

 

Thanks,

-Manish

 

 

 

 


		
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Re: MPC 8260/70 MCC SI Clocking and TSA Sync

[Solan]

Manish Joshi <mjoshi_blr <at> yahoo.com> writes:

> 
> 
> Hi,
>  
> I am trying to bring up MCC (Multi Channel Communication controller) on 
MPC8270 board for T1/E1.
> The overall configuration looks fine since I am able to have a 
communication properly if I do a T1 Cross over Loopback and tx/rx 
HDLC data.
> The things do not work smoothly if I connect my T1 line with an external 
device and start HDLC.
> I am seeing 'NO' (Rx Non-Octet Alligned Frame) errors in my rx buffers. 
Sometimes I also see Rx abort errors.
> I do not see this issue on the tx side i.e the external device does not 
report any of these when I tx HDLC data to it.
>  
> Does anybody have any experience dealing with this ? 
>  
> As far as clocking and sync with TSA is concerned, I have just 
configured 
> CMXSI2CR register with 0x00 ( I have only TDM2A driven by CLK1) and 
nothing else. 
> Do I need to do something more for clocking etc? Also I am doing this 
before SI initialisation.
> I will also try doing it just after TDM init and see if it helps.
> Please help.
>  
> Thanks,
> -Manish
>  
>  
>  
>  
> 
> 		Yahoo! for GoodClick here to donate to the Hurricane 
Katrina relief effort. 
> 
> 
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded <at> ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded

Hi Manesh,
Do you by chance have the linux driver you can share for implementing MCC 
driver for MPC 8270. I am trying to implement a driver for enabling the 
MCC on MPC 8250 and will be great to have a reference code.
Regards,
Solan