Embedded Trace Buffer (Etb) - Segger J-Link User Manual

Hide thumbs Also See for J-Link:

Table of Contents

17.3 Embedded Trace Buffer (ETB)

The ETB is a small, circular on-chip memory area where trace information is stored

during capture. It contains the data which is normally exported immediately after it

has been captured from the ETM. The buffer can be read out through the JTAG port of

the device once capture has been completed. No additional special trace port is

required, so that the ETB can be read via J-Link. The trace functionality via J-Link is

limited by the size of the ETB. While capturing runs, the trace information in the

buffer will be overwritten every time the buffer size has been reached.

The result of the limited buffer size is that not more data can be traced than the

buffer can hold. Because of this limitation, an ETB is not a fully- alternative to the

direct access to an ETM via J-Trace.

J-Link / J-Trace (UM08001)