AM1806 datasheet(11/244 Pages) TI1

11 / 244 page

AM1806

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SPRS658C

– FEBRUARY 2010 – REVISED APRIL 2011

2.3.6

Embedded Trace Macrocell (ETM) and Embedded Trace Buffer (ETB)

To support real-time trace, the ARM926EJ-S processor provides an interface to enable connection of an

Embedded Trace Macrocell (ETM). The ARM926ES-J Subsystem in the device also includes the

Embedded Trace Buffer (ETB). The ETM consists of two parts:

•

Trace Port provides real-time trace capability for the ARM9.

•

Triggering facilities provide trigger resources, which include address and data comparators, counter,

and sequencers.

The device trace port is not pinned out and is instead only connected to the Embedded Trace Buffer. The

ETB has a 4KB buffer memory. ETB enabled debug tools are required to read/interpret the captured trace

data.

2.3.7

ARM Memory Mapping

By default the ARM has access to most on and off chip memory areas, including EMIFA, DDR2, and the

additional 128K byte on chip SRAM. Likewise almost all of the on chip peripherals are accessible to the

ARM by default.

See Table 2-2 for a detailed top level device memory map that includes the ARM memory space.

Device Overview

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AM1806 Datasheet(PDF) 11 Page - Texas Instruments