Atmel SAM4S Xplained Pro Starter and Evaluation Kit ATSAM4S-XPRO ATSAM4S-XPRO Data Sheet
Product codes
ATSAM4S-XPRO
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
190
12.6.11.4DSB
Data Synchronization Barrier.
Syntax
Syntax
DSB{cond}
where:
condis an optional condition code, see
condis an optional condition code, see
.
Operation
DSB acts as a special data synchronization memory barrier. Instructions that come after the DSB, in program
DSB acts as a special data synchronization memory barrier. Instructions that come after the DSB, in program
order, do not execute until the DSB instruction completes. The DSB instruction completes when all explicit memory
accesses before it complete.
Condition Flags
This instruction does not change the flags.
Examples
Condition Flags
This instruction does not change the flags.
Examples
DSB ; Data Synchronisation Barrier
12.6.11.5ISB
Instruction Synchronization Barrier.
Syntax
Syntax
ISB{cond}
where:
condis an optional condition code, see
condis an optional condition code, see
.
Operation
ISB acts as an instruction synchronization barrier. It flushes the pipeline of the processor, so that all instructions
ISB acts as an instruction synchronization barrier. It flushes the pipeline of the processor, so that all instructions
following the ISB are fetched from cache or memory again, after the ISB instruction has been completed.
Condition Flags
This instruction does not change the flags.
Examples
Condition Flags
This instruction does not change the flags.
Examples
ISB
; Instruction Synchronisation Barrier