RMII ETH and STM32H743VIT6 hardware design

[khanhcong861989]

Dear all!

this is the first time i design TCP/IP board, i didn't have any experience before. i design hardware as UM2198( page1 and page 8), can you help to review and feedback me if it have any problem. Beside that i config on STM32CubeMX already. can you share me is it correct or not. many thanks for your support.

[CYANG.1]

Hi 

After reviewing the schematic roughly, please find my remarks below:

1.  According to the datasheet of LAN8742 (https://ww1.microchip.com/downloads/aemDocuments/documents/OTH/ProductDocuments/DataSheets/DS_LAN8742_00001989A.pdf),1µF and 470pF decoupling capacitors in parallel to ground should be used on VDDCR pin. please check the value of C114/C115 in your schematic?

2.  33ohm is also suggested to be added on pin11 of LAN8742 DV signal, just as RXD signals.

3. According to the datasheet of STM32H743VI, RXD0 is on PC4 and RXD1 is on PC5, but on your schematic, these two pins are in reverse, please double check.

4. Why is there a yellow signal on PC8?

 

B.R.

[khanhcong861989]

"3. According to the datasheet of STM32H743VI, RXD0 is on PC4 and RXD1 is on PC5, but on your schematic, these two pins are in reverse, please double check." i checked my design already, it is my mistake. may i swap these pin by STM32cubeMX. because i order PCB already.

"4. Why is there a yellow signal on PC8?" it is optional, i try to use external interrupt, to read data. 

[CYANG.1]

Hi

Since there is no RXD0 on PC5 and RXD1 on PC4. I think you may swap these two signals on 33ohm resistors' pads by flying wires after R132/R133 being removed.

 

B.R.