NXP Semiconductors K32 L2A Series, Reference Manual, Page: 895 / 1379

• Two DWT comparators (addresses or a data) provide programmable start/
stop recording
• CoreSight compliant debug functionality
35.1.3 Modes of operation
The MTB_RAM and MTB_DWT functions do not support any special modes of
operation. The MTB_RAM controller, as a memory-mapped device located on the
platform's slave AHB system bus, responds strictly on the basis of memory addresses for
accesses to its attached RAM array. The MTB private execution bus provides program
trace packet write information to the RAM controller. Both the MTB_RAM and
MTB_DWT modules are memory-mapped, so their programming models can be
accessed.
All functionality associated with the MTB_RAM and MTB_DWT modules resides in the
core platform's clock domain; this includes its connections with the RAM array.
35.2 External signal description
The MTB_RAM and MTB_DWT modules do not directly support any external
interfaces.
The internal interface includes a standard AHB bus with a 32-bit datapath width from the
appropriate crossbar slave port plus the private execution trace bus from the processor
core. The signals in the private execution trace bus are detailed in the following table
taken from the Arm CoreSight Micro Trace Buffer documentation. The signal direction is
defined as viewed by the MTB_RAM controller.
Table 35-1. Private execution trace port from the core to MTB_RAM
Signal Direction Description
LOCKUP Input Indicates the processor is in the Lockup state. This signal is driven LOW for cycles
when the processor is executing normally and driven HIGH for every cycle the
processor is waiting in the Lockup state. This signal is valid on every cycle.
IAESEQ Input Indicates the next instruction address in execute, IAEX, is sequential, that is non-
branching.
IAEXEN Input IAEX register enable.
IAEX[30:0] Input Registered address of the instruction in the execution stage, shifted right by one
bit, that is, PC >> 1.
ATOMIC Input Indicates the processor is performing non-instruction related activities.
EDBGRQ Output Request for the processor to enter the Debug state, if enabled, and halt.
Chapter 35 Micro Trace Buffer (MTB)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 895