C10.5 Branch Broadcast Control Register

The TRCBBCTLR characteristics are:

Purpose
Controls how branch broadcasting behaves, and enables branch broadcasting to be enabled for certain memory regions.
Usage constraints
  • Only accepts writes when the trace unit is disabled.
  • Must be programmed if TRCCONFIGR.BB == 1.
Configurations
Available in all configurations.
Attributes
See C10.1 ETM register summary.
Figure C10-4 TRCBBCTLR bit assignments
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[31:9]
Reserved, res0.
MODE, [8]

Mode bit:

0

Exclude mode. Branch broadcasting is not enabled in the address range that RANGE defines.

If RANGE==0 then branch broadcasting is enabled for the entire memory map.

1

Include mode. Branch broadcasting is enabled in the address range that RANGE defines.

If RANGE==0 then the behavior of the trace unit is constrained unpredictable. That is, the trace unit might or might not consider any instructions to be in a branch broadcast region.

RANGE, [7:0]

Address range field.

Selects which address range comparator pairs are in use with branch broadcasting. Each bit represents an address range comparator pair, so bit[n] controls the selection of address range comparator pair n. If bit[n] is:

0The address range that address range comparator pair n defines, is not selected.
1The address range that address range comparator pair n defines, is selected.

The TRCBBCTLR can be accessed through the external debug interface, offset 0x03C.

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