Hi,
I have some questions regarding DP83867IR RGMII sigal timing. Please see the below.
1.
According to datasheet of DP83867IR, the below is written in it.
Tcyc(min) = 7.2ns
Duty_G(min) = 45 %
From the above data, the minimum of Tw(RXCH) is 3.24ns
However, according to the data manual of AM572x, the minimum spec of Tw(RXCH) is 3.6ns(@1000Mbps). This means DP83867IR does not satisfy the requirement of AM572x processor. Is my understanding right? My customer would like to use DP83867IR with AM572x processor.
2.
I think DP83867IR's specification is based on "RGMIIv1_3.pdf" version1.3. I attached it. Please see it.
According to the page 4, Tskew exists two types.One is TskewT. And other one is TskewR.
However, according to the DP83867IR's datasheet, Tskew is only one. It is TskewT. Why isn't TskewR specified? My customer requests to modify the datasheet ofDP83867IR. How do you think about this point?
3.
Please see "Reduced Gigabit Media Independent Interface", there are not written about timings setup and hold in it. Is this setup/hold specification made by TI only?
4.
My customer said. Why are TsetupR and TholdR parameter specified in DP83867IR datasheet. As you know, DP83867 is phy. TsetupR and TholdR is parameter in MAC device side.
TsetupR and TholdR are requirement for DP83867IR to MAC device?
I appreciate your quik reply.
Best regards,
