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

• xcommon git@github.com:xcore/xcommon.git

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.