UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!
  1. Xilinx - Adaptable. Intelligent.
  2. Support
  3. AR# 46681: MIG Spartan-6 MCB - User Interface - Why are the pX_wr_full and pX_wr_empty UI signals held high during intialization?

AR# 46681

MIG Spartan-6 MCB - User Interface - Why are the pX_wr_full and pX_wr_empty UI signals held high during intialization?

Description

After reset and throughout initialization and calibration, the MIG Spartan-6 MCB user interface signals "px_wr_full"and "px_wr_empty" are both held high while "wr_count" is all zeros. This is not standard FIFO design where the full flag would be low while the count value is 0. This answer record details this expected behavior.


Note: This Answer Record is a part of the Xilinx MIG Solution Center (Xilinx Answer 34243). The Xilinx MIG Solution Center is available to address all questions related to MIG. Whether you are starting a new design with MIG or troubleshooting a problem, use the MIG Solution Center to guide you to the right information.

Solution

The Spartan-6 MIG design holds "px_wr_full" high during calibration to prevent data to from being written into the FIFO. Once calibration completes, "calib_done" asserts, px_wr_full will be brought low and normal operation writes and reads can be requested from the user interface.


For more information on the MCB User Interface signals, please see:
(Xilinx Answer 43322) MIG Spartan-6 MCB - User Interface - Signals and Parameter Descriptions

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
43322 MIG Spartan-6 MCB - User Interface - Signals and Parameter Descriptions N/A N/A

Associated Answer Records

Answer Number Answer Title Version Found Version Resolved
43322 MIG Spartan-6 MCB - User Interface - Signals and Parameter Descriptions N/A N/A
AR# 46681
Date 02/18/2013
Status Active
Type Known Issues
Devices
  • Spartan-6 LX
  • Spartan-6 LXT
  • Spartan-6Q
IP
  • MIG Virtex-6 and Spartan-6

By using this website, I accept the use of cookies.   Learn more

Page Bookmarked