dsp56800e Freescale Semiconductor, Inc, dsp56800e Datasheet - Page 317

• Manufacturer Part Number: dsp56800e
• Description: 16-bit Digital Signal Controller Core
• Manufacturer: Freescale Semiconductor, Inc

11.3.2
The core can also access the Enhanced OnCE module directly executing DSP56800E instructions which
access the Enhanced OnCE module as memory mapped registers. This technique operates independent of
the JTAG port.
Access to the Enhanced OnCE module from the DSC core is enabled through a set of memory-mapped
registers. All of the Enhanced OnCE resources are available through the memory mapped registers,
allowing access to the port via normal instruction execution. When accessed in this manner, there is no
need to access the port via JTAG.
Core access provides the ability to initialize the Enhanced OnCE module, use its resources, and monitor its
actions under program control. It also allows data to be uploaded or downloaded between the core and each
of the four Enhanced OnCE submodules. Both polled and interrupt driven communication between the
core and the Enhanced OnCE module is supported where appropriate.
Freescale SemiconductorJTAG and Enhanced On-Chip Emulation (Enhanced OnCE)
CORE_TLM_SEL
CORETAP_EN
TLM_RES_B
CORE_TDO
CORE_TDI
Core Access to the Enhanced OnCE Module
TMS
TCK
Figure 11-2. JTAG/Enhanced OnCE Interface Block Diagram
Controller
Access
JTAG
Test
Port
CDBR / CDBW
Enhanced OnCE
Transmit Register
Receive Register
Enhanced OnCE
Enhanced OnCE
Breakpoint Logic
Status & Control
Event Counter
(Eight stages)
Step Counter
TX/RX Logic
Trace Buffer
Step Logic
Command
Instruction
Queue
Accessing the Enhanced OnCE Module
PAB
PAB
XAB1
PAB
11-5