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AR# 35435

11.1 EDK, XPS_MCH_EMC - Write-to-write flash timing violated

Description

When using the xps_mch_emc core, the spacing between writes is too short, violating the back-to-back write timing specifications (tWPH).

This issue potentially affects flash devices when the xps_mch_emc is configured to use data width matching, and software performs accesses wider than the aggregate data width of all flash devices used. For example, a 32-bit access to a 16-bit flash will cause data width matching.

Solution

A patch is available to guard against violating tWPH. It can be downloaded from:

http://www.xilinx.com/txpatches/pub/applications/misc/ar35435.zip

The patch adds an additional timing parameter for each memory bank: C_TWPH_PS_MEM_0, C_TWPH_PS_MEM_1, C_TWPH_PS_MEM_2, and C_TWPH_PS_MEM_3.

INSTALLATION:

1. Extract the archive to a temporary folder.
2. Copy the contents of the archive to the <Project>\pcores folder.
3. Restart XPS.

Update the C_TWPH_PS_MEM_x parameter in the MHS for the associated memory. C_TWPH_PS_MEM_x defines the delay between writes in picoseconds (ps). Rebuild the netlist.

COMPATIBILITY:
The XPS_MCH_EMC core is currently not planned to be updated with this enhancement.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
34609 12.x EDK - Master Answer Record List N/A N/A
AR# 35435
Date Created 04/28/2010
Last Updated 12/15/2012
Status Active
Type General Article
Devices
  • Spartan-3
  • Spartan-3 XA
  • Spartan-3A
  • More
  • Spartan-3A DSP
  • Spartan-3AN
  • Spartan-3E
  • Spartan-6 LX
  • Spartan-6 LXT
  • Less
Tools
  • EDK - 10.1 sp2
  • EDK - 10.1
  • EDK - 10.1 sp1
  • More
  • EDK - 10.1 sp3
  • EDK - 11.1
  • EDK - 11.2
  • EDK - 11.3
  • EDK - 11.4
  • EDK - 11.5
  • EDK - 12.1
  • EDK - 9.2i
  • EDK - 9.2i sp1
  • EDK - 9.2i sp2
  • EDK - 9.2i sp3
  • EDK - 9.2i sp4
  • Less
IP
  • XPS Multi-CHannel External Memory Controller