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XCORE.com SDRAM SOFTWARE COMPONENT

Stable release:1.2 unreleased - based on SDRAM 1.1 of April 2010
Status: Initial updates to current tools, pending testing.
Maintainer:Russ Ferriday
Description:A Burst Mode access driver for the Micron Technology MT48LC16M16A2 Synchronous DRAM

Key Features

  • One thread reads/writes data to SDRAM
  • Optimised for burst access of blocks of 32 bit words (not for random access)
  • Application retains control of refresh by calling sdram_refresh at appropriate to prevent unexpected delays
  • 16-bit - Peak write: 50MB/s, read 50MB/s. Single word write (3 threads): 3120ns, read 3520ns.
  • 4-bit - Peak write: 12.5MB/s, read 12.5MB/s. Single word write (4 threads): approx 2.5us, approx 3us.
  • Code size: 2KB
  • Thread count: 1

To Do

  • Test on representative hardware.
  • Document test procedure and check schematics
  • Resolve two warnings related to buffered port
  • Improve documentation for integrators

Firmware Overview

  • module_sdram_burst: the burst mode driver
  • app_sdram_burst_example: contains a c client and an xc test harness

Known Issues

  • Two warnings produced in XDE 11.2 related to buffered port
  • Untested since moving to XDE 11.2

Required Repositories

Support

Issues may be submitted via the Issues tab in this github repo. Response to any issues submitted are at the discretion of the maintainer of this component.

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