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SC140 DSP Core Reference Manual 4-1

Chapter 4

Emulation and Debug (EOnCE)

The SC140 core provides board and chip-level testing capability through two on-chip modules:

• Enhanced on-chip emulation (EOnCE) module

• Joint test action group (JTAG) test access module

These modules are accessed through the JTAG or EOnCE port.

The EOnCE module provides a means of non-intrusive interfacing with the SC140 core and its peripherals,

enabling users to examine registers, memory, or on-chip peripherals. Special circuits and dedicated signals

on the core are defined, which avoid sacrificing user-accessible on-chip resources. With respect to

developing applications for the SC140, the EOnCE provides application developers the following:

• Breakpoints on address ranges

• Breakpoints on data bus values

• Detection of events, which can initiate a number of different actions determined by a developer

• Non-destructive access to the core and its peripherals

• Various means of profiling

• Program tracing

4.1 Debugging System

With the JTAG or EOnCE interface, the user can insert the SC140 core into a target system while retaining

debug control. The EOnCE module is used in DSP devices that are based on the SC140 to debug

application software in real time. EOnCE is a separate on-chip block that allows non-intrusive interaction

with the core. It is accessible through the contents of the JTAG interface signals as well as from the

software. The EOnCE module makes it possible to examine the contents of registers, memory, or on-chip

peripherals in a special debug environment. This avoids sacrificing user-accessible on-chip resources to

perform debugging.

The EOnCE module provides system-level debugging for real-time systems with the ability to:

• Maintain a running log and trace when tasks and interrupts are executed.

• Debug the operation of real-time operating systems (RTOS).

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