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XC164CS Datasheet(PDF) 29 Page - Infineon Technologies AG |
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XC164CS Datasheet(HTML) 29 Page - Infineon Technologies AG |
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29 / 71 page  XC164 Derivatives Functional Description Data Sheet 25 V2.1, 2003-06 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 XC164. The user software running on the XC164 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 break lines) to communicate with external circuitry. These interface signals are realized as alternate functions on Port 3 pins. Complete system emulation is supported by the New Emulation Technology (NET) interface. Via this full-featured emulation interface (including internal buses, control, status, and pad signals) the XC164 chip can be connected to a NET carrier chip. The use of the XC164 production chip together with the carrier chip provides superior emulation behavior, because the emulation system shows exactly the same functionality as the production chip (use of the identical silicon). |
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