Datasheet

738

AT32UC3A

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

35.4.3.1 Trace operation

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.

Table 35-1. Auxiliary port signals

Signal Direction Description

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

AVR 3 2

AU X+ JT A G

debug tool

JTA G

AUX

high speed

M ictor38

T race buffer

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