u/GiraffeMedium6667

Hello!

I'm mostly finished with this DDR routing for the Allwinner A33. I'm only done and wanted to ask some questions.

The stackup is as follows:

L1-SIG

L2-GND

L3-PWR

L4-SIG

L5-GND

L6-SIG

A few questions I have are:

1. What's the simplest way to make a reference voltage for the VREFCA and VREFDQ pins on the DRAM chip?

2. Do I need extra components on the CK/CK# lines?

3. Will the signals on L4 be badly interfered with by the power islands on L3?

4. Will crosstalk be a large problem with the long parallel traces?

Thanks!

Hi,

I'm relatively new to PCB design and I just finished my first board with the ESP32. It uses a USB C 6 pin, an ESP32 PICO MINI 02 N8R2, and 6 buttons with an SD card reader, a 4 pin header for an OLED display, and a 2 pin header for UART.

The stackup is as follows:

Top - Components, small voltage plane

L1 - GND

L2 - 3.3V

Bottom - signals for SD card reader

I just wanted to know if there was anything I could improve on, or if there were any fatal errors that would prevent it from working, I'd be grateful for any feedback. Thanks!