This option is specific to the Trace Port Analyzer (TPA). It allows you to select the mode in which trace data is packed into the buffer of the TPA. Double and Quad packing modes enable multiple consecutive trace samples to be written to the same memory location within the TPA. This increases the trace depth and reduces the operation speed of the internal circuitry, but also results in coarser timestamping. Half-rate clocking and packing modes are available at TRACECLK frequencies above 100MHz.
|
Automatic |
This mode allows the TPA to select the best packing mode for the current portwidth. You should select this option if timestamping is not enabled. |
|
Normal Packing |
In this mode, a single trace sample is written to each memory location in the TPA. This gives the best possible resolution of timestamps, at the expense of trace depth. |
|
Double Packing |
In this mode, two consecutive trace samples are written to the same memory location in the TPA. This reduces the resolution of the timestamps, but increases the trace depth. |
|
Quad Packing |
In this mode, four consecutive trace samples are written to the same memory location in the TPA. This gives the greatest trace depth, but further reduces the resolution of timestamps. |
.
This
option is only available for ETM
targets that are connected via MultiTrace
or RealView Trace.
Some combinations of packing mode and port width might not be valid for
your system. For example, Quad Packing might only be possible if you are
using a narrow port width.
Refer to the documentation for your TPA
for more details.