On-Chip Emulation Module
Introduction
MOTOROLA
DSP56309UM/D 10-3
10.1
INTRODUCTION
The DSP56300 core On-Chip Emulation (OnCEª) module provides a means of
interacting with the DSP56300 core and its peripherals nonintrusively so that a user can
examine registers, memory, or on-chip peripherals, thus facilitating hardware and
software development on the DSP56300 core processor. To achieve this, special circuits
and dedicated signals on the DSP56300 core are defined to avoid sacrificing any
user-accessible on-chip resource. The OnCE module resources can be accessed only after
executing the JTAG instruction ENABLE_ONCE. These resources are accessible even
when the chip is operating in normal mode. See
of the JTAG functionality and its relation to the OnCE module.
block diagram of the OnCE module.
10.2
OnCE MODULE SIGNALS
The OnCE module controller functionality is accessed through the JTAG port. There are
no dedicated OnCE module signals for the clock, data in, or data out. The JTAG signals
TCK, TDI, and TDO are used to shift in and out data and instructions. See
on page 11-4 for the description of the JTAG signals. To
facilitate emulation-specific functions, one additional signal, called DE, is provided on
the DSP56309.
Figure 10-1
OnCE Module Block Diagram
Trace
Buffer
Breakpoint
Logic
Pipeline
Information
Trace Logic
OnCE
Controller
PAB
YAB
XAB
PDB
PIL GDB
TDO
TRST
TDI
TCK
Tags
Buffer
Control Bus
DE
AA0702
Содержание DSP56309
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