Hi Alex, We have also made many variation boards, including 2 PHY design, dual gigabit phy, etc.
We massively produce our own core boards www.ariaboard.com, We found out on some early revision of our boards there may exist strange "PHY not found" and "PHY 0:0x" jumping issue, the audio (TLV320AIC3106) has strange issue as well after long time uptime. We found that the RESET pin on both chips (8710A and TLV320AIC3106) are too close to the MCLK pins. which is a 25MHz and 24MHz clock source receptively. The RESET pins are directly connected to AM335x SYS_RESET pin. Our design was the SAME with BB and BBB. We suspected the high frequency CLK signal generated by crystals have effect on RESET pin, therefore we used external RESET mechanism. used an RC circuit to connect to the RESET of both chips. The phenomenon seemed went away for us so far (1k boards made, all good), we are going to produce another 2k boards very soon to verify this and 1mil boards next year. On Tue, Dec 16, 2014 at 8:38 PM, <[email protected]> wrote: > > c2h2, > > Could you please tell us what change you did in your design to make it > better? > > Regards > > Alex > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
