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Arm Cortex-A55 Core Technical Reference Manual : TRCBBCTLR, Branch Broadcast Control Register

TRCBBCTLR, Branch Broadcast Control Register

The TRCBBCTLR controls how branch broadcasting behaves, and allows branch broadcasting to be enabled for certain memory regions.

Bit field descriptions

Figure D8-5 TRCBBCTLR bit assignments


RES0, [31:9]
res0Reserved.
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.

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

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