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  3. AR# 53438: Soft Error Mitigation (SEM) v3.4 - Updated EXT shim module for use with 512 Mb and 1 Gb SPI Flash

AR# 53438

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Soft Error Mitigation (SEM) v3.4 - Updated EXT shim module for use with 512 Mb and 1 Gb SPI Flash

描述

When the SEM v3.4 IP is configured with the Correction by Replace or Classification features enabled, an external memory is required to store the data for these feature sets. The example design generated with the IP contains a shim that interfaces to an external SPI Flash, <component_name>_sem_ext.v[hd]. This generated EXT shim is designed for legacy SPI Flash devices supporting the fast read command (0x0B), with one byte of dummy cycles prior to data validity. The EXT shim issues the enable four-byte addressing command (0xB7) when the density of the required SPI Flash exceeds 128 Mb.

解决方案

If the external storage device is a 512 Mb Flash or a 1 Gb SPI Flash, additional SPI Flash configuration commands are required (e.g. write enable command, write volatile config register). For these cases, replace this example file with the EXT shim file provided in this answer record (sem_ext.zip). This example EXT shim applies to designs targeting Virtex-7 SSI devices (XC7VH580T, XC7VH870T, XC7VX1140T, XC7VX2000T), and must be modified if needed to support other devices.

The SEM solution has been tested with this replacement EXT shim on the following SPI Flash devices:

  • 512 Mb Micron: N25Q512A13
  • 1024 Mb Micron N25Q00A13

附件

文件名 文件大小 File Type
sem_ext.zip 6 KB ZIP
AR# 53438
日期 03/02/2013
状态 Active
Type 综合文章
器件
Tools
IP
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