DS80PCI810: Could you pls help review the schematic diagram designing ?

Greetings,

1). Since this is a PCIe design, I am assuming signal driving EXP_A_TX_n_DP/N all have AC coupling Caps.

2). Pin 24 is VIN. I am not sure why it is called GND on U84 pin designator.

3). PRSTN# is tied to GND through 0-ohm Resistor. Label for this pin is PWDN. Please use correct name for the pin.

4). PWDN pin typically is tied to PERST# - after this signal has been inverted.

5). VDD_Sel pin 25 is tied to GND – 3.3V Mode. However, pin 24 – VIN labeled as GND – is floating. Please note in 3.3V mode we need to connect pin 24 – VIN to 3.3V supply.

Please update DS80PCI810 pin designator as shown in the DS80PCI810 data sheet( https://www.ti.com/lit/ds/symlink/ds80pci810.pdf?ts=1636419181287&ref_url=https%253A%252F%252Fwww.ti.com%252Fsitesearch%252Fdocs%252Funiversalsearch.tsp%253FlangPref%253Den-US%2526searchTerm%253Dds80pci810%2526nr%253D143  ) and let us review again. This way we would be able to review the schematic in more details.

Regards ,, Nasser

Hi Xiaofu,

Please note some comments below:

1). RXDET Pin 22: This pin is tied to GND through 0-ohm Resistor. Please note table 2 of the data sheet. This means we are selecting manual RX-detect and input is Hi-Z. Please make sure indeed this is what is needed for this application. For PCIe application this pin needs to floating or tied to GND through 20K-Ohm R.

2). Please note for SMBus operation, pins SMB_DATA_MAIN and SMB_CLK_MAIN need to be pulled up to 3.3V through 2K to 5K R.

3). Please note data sheet pin function related to pin#13. This is a reserved pin and must be tied to GND through 1K-R.

4). Please note data sheet pin function related to pin#23. This should be flaoting.

Other than these, schematic look ok. Please note data sheet pin functions and termination closely.

Regards ,, Nasser