LM3S1958 Datasheet, PDF (33/435 Pages) List of Unclassifed Manufacturers – Microcontroller

LM3S1958 Microcontroller
2.2.2
2.2.3
Embedded Trace Macrocell (ETM)
ETM was not implemented in the Stellaris^® devices. This means Chapters 15 and 16 of the ARM®
Cortex™-M3 Technical Reference Manual can be ignored.
Trace Port Interface Unit (TPIU)
The TPIU acts as a bridge between the Cortex-M3 trace data from the ITM, and an off-chip Trace
Port Analyzer. The Stellaris^® devices have implemented TPIU as shown in Figure 2-2 on page 33.
This is similar to the non-ETM version described in the ARM® Cortex™-M3 Technical Reference
Manual, however, SWJ-DP only provides SWV output for the TPIU.
Figure 2-2. TPIU Block Diagram
Debug
ATB
Slave
Port
ATB
Interface
Asynchronous FIFO
Trace Out
(serializer)
Serial Wire
Trace Port
(SWO)
APB
Slave
Port
APB
Interface
2.2.4
2.2.5
2.2.6
ROM Table
The default ROM table was implemented as described in the ARM® Cortex™-M3 Technical
Reference Manual.
Memory Protection Unit (MPU)
The Memory Protection Unit (MPU) is included on the LM3S1958 controller and supports the standard
ARMv7 Protected Memory System Architecture (PMSA) model. The MPU provides full support for
protection regions, overlapping protection regions, access permissions, and exporting memory
attributes to the system.
Nested Vectored Interrupt Controller (NVIC)
The Nested Vectored Interrupt Controller (NVIC):
■ Facilitates low-latency exception and interrupt handling
June 14, 2007
33
Luminary Micro Confidential-Advance Product Information