POSITION

MASTER

FLOW

BASE

WRAP : This bit is set to 1 automatically when the POINTER value wraps as determined by the MASTER.MASK field in the MASTER Trace Control Register.
bits : 2 - 2 (1 bit)
access : read-write

POINTER : Trace packet location pointer. Because a packet consists of two words, the POINTER field is the location of the first word of a packet. This field contains bits [31:3] of the address, in the SRAM, where the next trace packet will be written. The field points to an unused location and is automatically incremented. A debug agent can calculate the system address, on the AHB-Lite bus, of the SRAM location pointed to by the POSITION register using the following equation: system address = BASE + ((P + (2AWIDTH - (BASE MOD 2AWIDTH))) MOD 2AWIDTH). Where P = POSITION AND 0xFFFF_FFF8. Where BASE is the BASE register value
bits : 3 - 31 (29 bit)
access : read-write

MASK : This value determines the maximum size of the trace buffer in SRAM. It specifies the most-significant bit of the POSITION.POINTER field that can be updated by automatic increment. If the trace tries to advance past this power of two, the POSITION.WRAP bit is set to 1, the POSITION.POINTER[MASK:0] bits are set to zero, and the POSITION.POINTER[AWIDTH-4:MASK+1] bits remain unchanged. This field causes the trace packet information to be stored in a circular buffer of size 2(MASK+4) bytes, that can be positioned in memory at multiples of this size. Valid values of this field are zero to AWIDTH-4. Values greater than the maximum have the same effect as the maximum.
bits : 0 - 4 (5 bit)
access : read-write

TSTARTEN : Trace start input enable. If this bit is 1 and the TSTART signal is HIGH, then the EN bit is set to 1. Tracing continues until a stop condition occurs.
bits : 5 - 5 (1 bit)
access : read-write

TSTOPEN : Trace stop input enable. If this bit is 1 and the TSTOP signal is HIGH, then the EN bit is set to 0. If a trace packet is being written to memory, the write is completed before tracing is stopped.
bits : 6 - 6 (1 bit)
access : read-write

SFRWPRIV : Special Function Register Write Privilege bit. If this bit is 0, then User or Privileged AHB-Lite read and write accesses to the Special Function Registers are permitted. If this bit is 1, then only Privileged write accesses are permitted and User write accesses are ignored. The HPROT[1] signal determines if an access is User or Privileged.
bits : 7 - 7 (1 bit)
access : read-write

RAMPRIV : SRAM Privilege bit. If this bit is 0, then User or Privileged AHB-Lite read and write accesses to the SRAM are permitted. If this bit is 1, then only Privileged AHB-Lite read and write accesses to the SRAM are permitted and User accesses are RAZ/WI. The HPROT[1] signal determines if an access is User or Privileged.
bits : 8 - 8 (1 bit)
access : read-write

HALTREQ : Halt request bit. This bit is connected to the halt request signal of the trace logic, EDBGRQ. When HALTREQ is set to 1, EDBGRQ is asserted if DBGEN is also HIGH. The HALTREQ bit can be automatically set to 1 using the FLOW.WATERMARK field.
bits : 9 - 9 (1 bit)
access : read-write

EN : Main trace enable bit. When this bit is 1 trace data is written into the SRAM memory location addressed by POSITION.POINTER. The POSITION.POINTER value auto increments after the trace data packet is written. The EN bit can be automatically set to 0 using the FLOW.WATERMARK field and the FLOW.AUTOSTOP bit. The EN bit is automatically set to 1 if the TSTARTEN bit is 1 and the TSTART signal is HIGH. The EN bit is automatically set to 0 if TSTOPEN bit is 1 and the TSTOP signal is HIGH.
bits : 31 - 31 (1 bit)
access : read-write

AUTOSTOP : If this bit is 1 and WATERMARK is equal to POSITION.POINTER, then the MASTER.EN bit is automatically set to 0. This stops tracing.
bits : 0 - 0 (1 bit)
access : read-write

AUTOHALT : If this bit is 1 and WATERMARK is equal to POSITION.POINTER, then the MASTER.HALTREQ bit is automatically set to 1. If the DBGEN signal is HIGH, the MTB asserts this halt request to the Cortex-M0+ processor by asserting the EDBGRQ signal.
bits : 1 - 1 (1 bit)
access : read-write

WATERMARK : WATERMARK value. This field contains an address in the same format as the POSITION.POINTER field. When the POSITION.POINTER matches the WATERMARK field value, actions defined by the AUTOHALT and AUTOSTOP bits are performed.
bits : 3 - 31 (29 bit)
access : read-write

BASE : The value provided is the value of the SRAMBASEADDR[31:0] signal.
bits : 0 - 31 (32 bit)
access : read-only