Atmel Xplained Evaluation Board AT32UC3A3-XPLD AT32UC3A3-XPLD データシート

32072H–AVR32–10/2012

Debug tools utilizing the AUX port should connect to the device through a Nexus-compliant Mic-
tor-38 connector, as described in the AVR32UC Technical Reference manual. This connector
includes the JTAG signals and the RESET_N pin, giving full access to the programming and
debug features in the device.

Figure 35-3. AUX+JTAG based Debugger

Trace features are enabled by writing OCD registers by JTAG. The OCD extracts the trace infor-
mation from the CPU, compresses this information and formats it into variable-length messages
according to the Nexus standard. The messages are buffered in a 16-frame transmit queue, and
are output on the AUX port one frame at a time.

Auxiliary Port Signals

MCKO

Output

Trace data output clock

MDO[5:0]

Output

Trace data output

MSEO[1:0]

Output

Trace frame control

EVTI_N

Input

Event In

EVTO_N

Output

Event Out

A V R 3 2

A U X + J T A G

d e b u g   t o o l

J T A G

A U X

h ig h   s p e e d

M ic t o r 3 8

T r a c e   b u f f e r

P C