SAM-BA® ISP - Applets: Initialize External RAM

Initialize External RAM (extram)

The extram applet initializes external RAM.

The extram applet applies to the following devices. Documentation is available in the ../sam-ba/doc/ directory.

Device Documentation
SAM9X60 ../doc/sam9x60.html
SAM9XX5 ../doc/sam9xx5.html
SAMA5D2 Series ../doc/sama5d2.html
SAMA5D3 ../doc/sama5d3.html
SAMA5D4 ../doc/sama5d4.html
SAMV71 ../doc/samv71.html

Additional documentation is located in the document directory: ../doc/extram.html.

extram Command Structure

The extram applet has the following command structure:

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The Initialize Device Clock Tree (lowlevel) applet should be executed prior to executing the Initialize External RAM (extram) applet. The lowlevel applet initializes the external RAM bus clock frequency.

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$ sam-ba -p serial -d <device> -a lowlevel
$ sam-ba -p serial -d <device> -a extram:help

Syntax: extram:[<preset>]
Parameters:
    preset  External RAM chip
Examples:
    extram    use default board settings
    extram:1  use preset 1 for type of external RAM

The extram applet accepts a single <preset> parameter which tells the applet which SDRAM chip is connected to the device. A list of preset parameter values by device is located in the ../doc/extram.html directory.

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