SWD bus: [Serial Wire Debug], defines a point-to-point two wire serial bus developed by ARM in 2004.
In some cases the Serial Wire Debug uses the acronym [SW-DB] is used when refering to the Serial Wire Debug interface.
SWD is designed to replace the normal 5-pin JTAG port with a clock and single bi-directional data pin, providing all the normal JTAG debug and test functionality. SWD avoids the need to use scan chains for debug.
SWD uses an ARM standard bi-directional wire protocol, defined in the ARM Debug Interface, to pass data to and from the debugger and the target system. The SWD bus is a standard interface for ARM-based devices.
The new multi-drop SWD released in 2009 is fully backwards compatible with the previous version, retaining existing single point-to-point host equipment connections, and enables a device to power down completely while that device is not selected, reducing power consumption. The ARM multi-drop SWD has been designed to be fully interoperable with the recently announced IEEE 1149.7 standard.
Seems like the names Serial Wire Debug and Single Wire Debug are interchangeable.
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Related posting; Design-For-Testability.
Electronic Engineering Design Key words: Bus types, Bus Standard, Interface Standard Data Bus,
Specification, Spec, Interface,
IC, Physical Interface, Topology, Description, Physical Interface, Cable Buses, JTAG.
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