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AM1808 Datasheet(PDF) 10 Page - Texas Instruments |
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AM1808 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 265 page  AM1808 SPRS653E – FEBRUARY 2010 – REVISED MARCH 2014 www.ti.com 3.3.6 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. 3.3.7 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. To improve security and/or robustness, the device has extensive memory and peripheral protection units which can be configured to limit access rights to the various on/off chip resources to specific hosts; including the ARM as well as other master peripherals. This allows the system tasks to be partitioned between the ARM and DSP as best suites the particular application; while enhancing the overall robustness of the solution. See Table 3-2 for a detailed top level device memory map that includes the ARM memory space. 10 Device Overview Copyright © 2010–2014, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: AM1808 |
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