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AR# 58420

ZC706 - Does the ZC706 Evaluation Platform Support SDIO Cards?

Description

The INIT LED pulses red and the system becomes unresponsive when I plug an SDIO card (e.g., WiFi) into the SD card socket on my ZC706 Evaluation Platform.

Does the ZC706 Evaluation Platform support SDIO cards?

Solution

Yes, the ZC706 Evaluation Platform can work correctly with SDIO cards, but this support requires a slight modification to the board. SDIO cards (espescially WiFi cards) require additional capacitance on on the 3.3V rail used by the SDIO interface.

Internal testing at Xilinx has shown that an additional 100uF capacitor between the 3.3V rail and GND on the SDIO interface enables SDIO functionality.

One option for such a capacitor is the following 100uF ceramic, +/-20% tolerance and X5R dielectric in a 1812 package.
http://www.digikey.com/product-detail/en/C4532X5R0J107M%2F3/C4532X5R0J107M%2F3-ND/514014

A similar capacitor is available in a 1206 package which will fit better between SD connector pins.

The capacitor should be connected between pins 3 and 4 of J30, as shown below.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
51899 Zynq-7000 AP SoC ZC706 Evaluation Kit - Known Issues and Release Notes Master Answer Record N/A N/A
AR# 58420
Date Created 11/17/2013
Last Updated 11/22/2013
Status Active
Type General Article
Devices
  • SoC
  • Zynq-7000
Tools
  • PetaLinux SDK
  • PetaLinux SDK - 2013.04
  • PetaLinux SDK - 2013.10
Boards & Kits
  • Zynq-7000 All Programmable SoC Boards and Kits
  • Zynq-7000 All Programmable SoC ZC706 Evaluation Kit