DP83848VYB: DP83848 is not recognized by the computer

Hi Amy,

Could you clarify what is meant by the computer not being able to recognize the board? Is this during the schematic design/layout phase, or has the design already been fabricated and cannot linkup?

Thanks,

Evan

Hi Evan,

The design has already been fabricated.

Just like the screenshot above, when the network cable is plugged into the computer and the Ethernet connector end of the chip, the computer end will always show that the network cable is unplugged

Best Regards,

Amy

Hi Amy,

Thank you for clarifying. The schematic and PCB layout look good, but it is difficult to verify without the file. Could you provide a block diagram of the application? In addition, are there any differences in the application between the 6-layer board layout and when the 848 circuit is made separately?

Thanks,

Evan

Hi Evan,

The block diagram is as follows

The ARM is the main chip, and the left side is connected with a high-speed USB PHY interface chip, an 83848 chip, and a 232 chip.The other side is connected to the FPGA for communication.

There is no big difference. The 848 is a 4-layer board, and there are no other devices such as 232\ARM\FPGA chips.

Below is the PCB layout for each layer

top

GND 

signal

power

bottom

Best,

Amy

Hi Amy,

Amy Luo said:

when the DP81848 circuit is made board separately

When the 848 is tested in this case, is the 848 a completely separate board from the master board, or is it acting as an interconnect?

Is the customer able to read the PHY registers and provide a (0 to 1E) dump for each case?

Thanks,

Evan