Bond-out processor
A bond-out processor is an emulation processor that takes the place of the microcontroller or microprocessor in the target board while an application is being developed.

Bond-out processors have internal signals and bus brought out to external pins. The term bond-out derives from connecting (or bonding) the emulation circuitry to these external pins. These devices are designed to be used within an in-circuit emulator and are not typically used in any other kind of system.

Bond-out pins were marked as no-connects in the first devices produced by Intel, and were usually not connected to anything on the ordinary production silicon. Later bond-out versions of the microprocessor were produced in a bigger package to provide more signals and functionality.

Bond-out processors provides capabilities far beyond those of a simple ROM monitor. A ROM monitor is a firmware program that runs instead of the application code and provides a connection to a host computer to carry out debugging functions. In general the ROM monitor uses part of the processor resources and shares the memory with the user code. 

Bond-out processors  can handle complex breakpoints (even in ROM), real-time traces of processor activity, and no use of target resources. But this extra functionality comes at a high cost, as bond-outs have to be produced for in-circuit emulators only.

Therefore, sometimes solutions similar to bond-outs are implemented with an ASIC or FPGA or a faster RISC processor that imitates the core processor code execution and peripherals.

References

External links
 http://www.embedded.com/design/debug-and-optimization/4395414/Real-Time-Debugging-with-ROM-Monitors

Embedded systems