D8.69 TRCSYNCPR, Synchronization Period Register

The TRCSYNCPR controls how often periodic trace synchronization requests occur.

Bit field descriptions

The TRCSYNCPR is a 32-bit register.

Figure D8-66 TRCSYNCPR bit assignments
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RES0, [31:5]
PERIOD, [4:0]

Defines the number of bytes of trace between synchronization requests as a total of the number of bytes generated by both the instruction and data streams. The number of bytes is 2N where N is the value of this field:

  • A value of zero disables these periodic synchronization requests, but does not disable other synchronization requests.
  • The minimum value that can be programmed, other than zero, is 8, providing a minimum synchronization period of 256 bytes.
  • The maximum value is 20, providing a maximum synchronization period of 220 bytes.

Bit fields and details not provided in this description are architecturally defined. See the Arm® Architecture Reference Manual Armv8, for Armv8-A architecture profile.

The TRCSYNCPR can be accessed through the external debug interface, offset 0x034.

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