Re: [802.3ae] WIS status 2 register
Ramakant
You are correct. We do not mandate that a misbehaving MDIO controller has to
return non-<10> for the device present bits. In fact, a misbehaving MDIO
controller may well return <10> for these bits.
This is one of those logic cases where the return of non-<10> means that the
MMD is definitely not working correctly, but the return of <10> means that the
MMD may or may not be working correctly.
Ed
Ramakant Kapatral wrote:
> Hi Ed,
> Now further doubt comes is, when MDIO controller itself is not behaving
> properly then giving out the specific bit pattern (00,01,11) can not be
> guaranteed.
> regards
> Ramakant
>
> -----Original Message-----
> From: owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx
> [mailto:owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx]On Behalf Of Ed Turner
> Sent: Tuesday, January 15, 2002 2:46 AM
> To: HSSG Reflector (E-mail)
> Subject: Re: [802.3ae] WIS status 2 register
>
> Manish,
>
> There are no specific conditions which will cause the device present
> bits in the WIS (or any other MMD) to return anything other than <10>.
> The purpose of these bits is to allow an STA to go and poll each of the
> possible MMDs that may be connected to it to find out who is there. The
> STA will know that these two bits will always return the same value (so
> long as there is a device there responding). If no device is present
> then the MDIO will float high and so the required alternate 10 value
> will not be returned.
> The description for these bits includes the sentence '.. or that the
> device is not functioning properly.' since there is a possibility that
> there is a device at that address, but it's MDIO controller is not
> behaving properly.
>
> Regards
> Ed
>
> Manish Agrawal wrote:
>
> >
> >
> > Hello,
> >
> > When should WIS will make the device present bits in WIS status 2
> > register ( i.e. 2.8.15:14) "00, 01, 11".
> >
> > In other words, In which conditions WIS will indicate "device is not
> > functioningproperly".
> >
> > Best Regards,
> >
> > Manish
>
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