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mywiki:ejtag

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mywiki:ejtag [2014/09/29 17:54] – shaoguohmywiki:ejtag [2022/04/02 17:28] (current) – external edit 127.0.0.1
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   - Sebug Access is used by debugger tools to access the internals of a chip making its resources and functionality available and modifiable, e.g. registers, memories and the system state.   - Sebug Access is used by debugger tools to access the internals of a chip making its resources and functionality available and modifiable, e.g. registers, memories and the system state.
   - Boundary Scan is used by hardware test tools to test the physical connection of a device, e.g. on a PCB. Although this is usually not the task of a debugger tool the TRACE32 debugger offers mechanisms to access the JTAG TAP in a generic way, e.g. to perform boundary scan using a PRACTICE script or a custom application.   - Boundary Scan is used by hardware test tools to test the physical connection of a device, e.g. on a PCB. Although this is usually not the task of a debugger tool the TRACE32 debugger offers mechanisms to access the JTAG TAP in a generic way, e.g. to perform boundary scan using a PRACTICE script or a custom application.
 +
 +Registers
 +| IR | Instruction Register |
 +| DR | Data Registers |
 +
 +The width of the IR is not specified by the JTAG standard but needs to be the same for all instructions of a 
 +specific device. Since the DR is selected according to the loaded instruction the DR width is variable.
 +
 +{{:mywiki:jtag_signal.png?|}}
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