ARM Cortex-M3

Embedded Trace Macrocell
ARM DDI 0337G Copyright © 2005-2008 ARM Limited. All rights reserved. 14-23
Unrestricted Access Non-Confidential
14.6.5 Cross trigger interface
Table 14-12 and Table 14-13 list the recommended Cross Trigger Interface (CTI)
connections for Cortex-M3 systems.
Table 14-11 Resource identification encoding
Resource type, bits [6:4] Index range, bits [3:0] Description of resource type
b010 0-3 DWT Comparator inputs (0-3)
b101 15 Trace Start/Stop resource
b110 0-1 ExtIn (0-1)
b110 15 HardWired (always True)
Table 14-12 Input connections
Trigger bit Source signal Source device Comments
[7] ETMTRIGOUT ETM Recommended if ETM is present.
[6] ETMTRIGGER[2] DWT Recommended.
[5] ETMTRIGGER[1] DWT Recommended.
[4] ETMTRIGGER[0] DWT Recommended.
[3] ACQCOMP ETB See Full.
[2] FULL ETB Recommended if an ETB is present. If a single ETB is shared
between multiple cores, only connect to the CTI of one of the
cores.
[1] User Defined - -
[0] DBGACK Core Compulsory.
Table 14-13 Trigger output connections
Trigger bit Source signal Source device Comments
[7] User defined - -
[6] User defined - -
[5] ETMEXTIN[1] ETM Compulsory if ETM is present.