Figure 9-3 Once Block Diagram - Motorola DSP56800 Manual

JTAG and On-Chip Emulation (OnCE™)
TDI / TDO
Together, these sub-modules provide a full-featured emulation and debug environment. Communication
with the OnCE port module is handled via the JTAG port and thus may be considered the primary
communications sub-module for the OnCE port, although it operates independently. The operations of the
OnCE port occur independently of the main DSP56800 core logic, and require no core resources.
9-6
Cmd. Reg.
OnCE
Command
Decoder
Control Register
Stat. Reg
Breakpoint Register
XAB1
MUX
PAB
PDB Register
X:$FFFF
PGDB Register
PAB Fetch Register
PAB Decode Register
PAB Execute Register
Address
FIFO
Figure 9-3. OnCE Block Diagram
DSP56800 Family Manual
OnCE Command,
Status, and Control
OnCE
State
Machine
and Control
Breakpoint
and Trace
Breakpoint
Logic
and
Trace
Count Reg.
PDB
Pipeline
PGDB
Registers
PAB
FIFO
History
Buffer
AA0096