COREMP7 Datasheet, PDF (24/30 Pages) Actel Corporation – CoreMP7

CoreMP7
• A separate UART to communicate with the
monitor program is not required.
The debugging of the target system requires the
following:
• A PC host computer running Windows to run the
debugger software
• An EmbeddedICE Protocol Converter, a separate
box which converts the serial interface to signals
compatible with the JTAG interface and a target
system with a JTAG interface and an ARM Debug
Architecture compliant core.
Once the system is connected, the debugger can start
communicating with the target system via the RVI-ME
(which is an EmbeddedICE Interface Converter).
The debug extensions consist of several scan chains
around the processor core, and some additional signals
that are used to control the behavior of the core for
debug purposes. The most significant of these additional
signals are as follows:
BREAKPT: This core signal enables external hardware to
halt processor execution for debug purposes. When
HIGH during an instruction fetch, the instruction is
tagged as breakpointed, and the core stops if this
instruction reaches execute.
DBGRQ: This core signal is a level-sensitive input that
causes the CPU core to enter debug state when the
current instruction has completed.
DBGACK: This core signal is an output from the CPU
core that goes HIGH when the core is in debug state so
that external devices can determine the current state of
the core.
RealView ICE uses these, and other signals, through the
debug interface of the processor core, for example by
writing to the control register of the EmbeddedICE logic.
For more details, refer to the debug interface section of
the ARM datasheet or technical reference manual for
your core.
JTAG Debug Interface
The RVI-ME ICE run control unit is supplied with a short
ribbon cable. These both terminate in a 20-way 2.54 mm
pitch IDC connector. You can use the cable to mate with
a keyed box header on the target. The pinout is shown in
Figure 16.
Figure 16 • JTAG Interface Pinout
VTref
1
2
Vsupply
nTRST
3
4
GND
TDI
5
6
GND
TMS
7
8
GND
TCK
9
10
GND
RTCK
11
12
GND
TDO
13
14
GND
nSRST
15
16
GND
DBGRQ
17
18
GND
DBGACK
19
20
GND
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