Texas Instruments OMAP5912 Reference Manual page 18

Overview
1.8 Emulation and Test Interfaces
1.9 General-Purpose Interfaces
1.10 Interfaces Multiplexing
18 Introduction
OMAP5912 has these emulation and test interface features:
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JTAG emulation capabilityfor non-realtime debug
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You can use a window tracer (WT) module to capture the memory
transactions from four interfaces: EMIFF, EMIFS, OCP-T1, and OCP-T2.
The captured information is sent outto the serial tracer interface (STI) for
processing for debugging purposes. For more detail on this memory
transaction trace, see Appendix E, Window Tracer.
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An embedded trace macrocell (ETM) to enable real-time trace of the MPU
subsystem operations
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Concurrent DSP and MPU emulation
OMAP5912 includes dedicated modules to support specific modulation and
control of general-purpose inputs and outputs:
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General-purpose input/output (GPIO) modules allow the monitoring and
control of OMAP5912 device input/output pins with event detection for
external interrupts support.
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The pulse width tone (PWT) module provides OMAP5912 output pins with
waveform control for tone generation.
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The pulse width light (PWL) module allows OMAP5912 output pins
waveform control for brightness light control.
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Two light pulse generator (LPG) modules allow OMAP5912 output pins
waveform control for LED blinking control.
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Three general-purpose timers enable OMAP5912 output pins waveform
control for pulse width modulation support and OMAP5912 input pins
events detection with timing stamp.
Because of the device I/O limitations, the interfaces are not accessible at the
same time, and some of them are multiplexed. For more detail on I/O
multiplexing and control, see Chapter 22, Pinout.
SPRU748A