CoreSight Components Technical Reference Manual: 10.1. About the Serial Wire Viewer

10.1. About the Serial Wire Viewer

The Instrumentation Trace Macrocell (ITM) and Serial Wire Output (SWO) can be used to form a SWV, as shown in Figure 10.1.

Figure 10.1. ITM and SWO as part of a SWV system

When the ITM and SWO are used as part of the SWV:

if PADDRDBG[12] is set LOW, the ITM registers are accessed
if PADDRDBG[12] is set HIGH, the SWO registers are accessed.

The ATIDM and AFREADYM outputs from the ITM are left unconnected. These signals are not required for the connection to SWO. Because of this, it is not necessary to write to the ITM Integration Register, ITATBCTR1, for integration testing against the SWO.

Note

For more information on the ITM and SWO, see Chapter 12 Instrumentation Trace Macrocell and Chapter 11 Serial Wire Output.

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