XC2287 / XC2286 / XC2285
XC2000 Family Derivatives
Preliminary
Functional Description
3.5
On-Chip Debug Support (OCDS)
The On-Chip Debug Support system provides a broad range of debug and emulation
features built into the XC228x. The user software running on the XC228x can thus be
debugged within the target system environment.
The OCDS is controlled by an external debugging device via the debug interface,
consisting of the IEEE-1149-conforming JTAG port and a break interface. The debugger
controls the OCDS via a set of dedicated registers accessible via the JTAG interface.
Additionally, the OCDS system can be controlled by the CPU, e.g. by a monitor program.
An injection interface allows the execution of OCDS-generated instructions by the CPU.
Multiple breakpoints can be triggered by on-chip hardware, by software, or by an
external trigger input. Single stepping is supported as well as the injection of arbitrary
instructions and read/write access to the complete internal address space. A breakpoint
trigger can be answered with a CPU-halt, a monitor call, a data transfer, or/and the
activation of an external signal.
Tracing data can be obtained via the JTAG interface or via the external bus interface for
increased performance.
The debug interface uses a set of 6 interface signals (4 JTAG lines, 2 optional break
lines) to communicate with external circuitry.
Data Sheet
47
V0.91, 2007-02
Draft Version
INFINEON [ Infineon ]
