OM11077 NXP Semiconductors, OM11077 Datasheet - Page 744

• Manufacturer Part Number: OM11077
• Description: MODULE DIMM LPC2478 ARM7
• Manufacturer: NXP Semiconductors

Specifications of OM11077

• Accessory Type: Module Card
• For Use With/related Products: ARM-57TS-LPC2478
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-4742

1. Features
2. Applications
3. Description
UM10237_4
User manual
3.1 ETM configuration
As the microcontroller has significant amounts of on-chip memories, it is not possible to
determine how the processor core is operating simply by observing the external pins. The
ETM provides real-time trace capability for deeply embedded processor cores. It outputs
information about processor execution to a trace port. A software debugger allows
configuration of the ETM using a JTAG interface and displays the trace information that
has been captured, in a format that a user can easily understand.
The ETM is connected directly to the ARM core and not to the main AMBA system bus. It
compresses the trace information and exports it through a narrow trace port. An external
Trace Port Analyzer captures the trace information under software debugger control.
Trace port can broadcast the Instruction trace information. Instruction trace (or PC trace)
shows the flow of execution of the processor and provides a list of all the instructions that
were executed. Instruction trace is significantly compressed by only broadcasting branch
addresses as well as a set of status signals that indicate the pipeline status on a cycle by
cycle basis. Trace information generation can be controlled by selecting the trigger
resource. Trigger resources include address comparators, counters and sequencers.
Since trace information is compressed the software debugger requires a static image of
the code being executed. Self-modifying code can not be traced because of this
restriction.
The following standard configuration is selected for the ETM macrocell.
Table 679. ETM configuration
Resource number/type
Pairs of address comparators
Data Comparators
Memory Map Decoders
Counters
Sequencer Present
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UM10237
Chapter 34: LPC24XX Embedded Trace Module (ETM)
Rev. 04 — 26 August 2009
Closely track the instructions that the ARM core is executing.
One external trigger input.
10 pin interface.
All registers are programmed through JTAG interface.
Does not consume power when trace is not being used.
THUMB instruction set support.
Rev. 04 — 26 August 2009
Small
1
0 (Data tracing is not supported)
4
1
No
[1]
© NXP B.V. 2009. All rights reserved.
User manual
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