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Introduction
ARM DDI 0363E Copyright © 2009 ARM Limited. All rights reserved. 1-11
ID013010 Non-Confidential, Unrestricted Access
1.4 External interfaces of the processor
The processor has the following interfaces for external access:
• APB Debug interface
• ETM interface
• Test interface.
For more information on these interfaces and how they are integrated into the system, see the
AMBA 3 APB Protocol Specification and the CoreSight Architecture Specification.
1.4.1 APB Debug interface
AMBA APBv3 is used for debugging purposes. CoreSight is the ARM architecture for
multi-processor trace and debug. CoreSight defines what debug and trace components are
required and how they are connected.
Note
The APB debug interface can also connect to a DAP-Lite. For more information on the
DAP-Lite, see the CoreSight DAP-Lite Technical Reference Manual.
1.4.2 ETM interface
You can connect an ETM-R4 to the processor through the ETM interface. The ETM-R4
provides instruction and data trace for the processor. For more information on how the ETM-R4
connects to the processor, see the CoreSight ETM-R4 Technical Reference Manual.
All outputs are driven directly from a register unless specified otherwise. All signals are relative
to CLKIN unless specified otherwise.
The ETM interface includes these signals:
• an instruction interface
• a data interface
• an event interface
• other connections to the ETM.
See ETM interface signals on page A-19 for information about the names of signals that form
these interfaces. See Event bus interface on page 6-19 for more information about the event bus.
1.4.3 Test interface
The test interface provides support for test during manufacture of the processor using Memory
Built-In Self Test (MBIST). For more information on the test interface, see MBIST signals on
page A-21. See the Cortex-R4 and Cortex-R4F Integration Manual for information about the
timings of these signals.