Other Parts Discussed in Thread: DP83TC811SEVM, DP83640
Tool/software:
Hi
I am trying to established a MII interface between external PHY DP83TC811SEVM and TMS570LC43x Hercules Development Kit (HDK). but unable to establish the coms yet, I have connected PHY-HDK in the following way, So my question is,
1. If we look at the HDK schematics https://www.ti.com/lit/zip/spnr043 there is a internal PHYTHER and which is works fine but when I switch to external PHY DP83TC811SEVM (using HDK toggle switch S2) its not responding. If we see the HDK schematics all the pins for MII interface matches between DP83640 & PHY DP83TC811SEVM except COL (U20, Pin 42) & CRS/CRS_DV (U20, Pin40) which doesn't exist in PHY and also those two pins are directly connected to MCU (U1D, Pin F3) (U1B, pinB4) in HDK schematics. So my confusion is, is it mandatory to connect COL & CSR/CRS_DV to the MCU (U1D, Pin F3) (U1B, pinB4) to external PHY or we need to configure those two pin as Pull Up or Pull down in HDK itself.
