P60ARM-B Zarlink Semiconductor, Inc., P60ARM-B Datasheet - Page 53
P60ARM-B
Manufacturer Part Number
P60ARM-B
Description
32-bit RISC microprocessor
Manufacturer
Zarlink Semiconductor, Inc.
Datasheet
1.P60ARM-B.pdf
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4.9.3 Data Aborts
If the address used for the swap is unacceptable to a memory management system, the internal MMU or
external memory manager can flag the problem by driving ABORT HIGH. This can happen on either the
read or the write cycle (or both), and in either case, the Data Abort trap will be taken. It is up to the system
software to resolve the cause of the problem, then the instruction can be restarted and the original program
continued.
Because no base register write-back is allowed, the behaviour of an aborted SWP instruction is the same
regardless of the state of the LATEABT control signal.
4.9.4 Instruction Cycle Times
Swap instructions take 1S + 2N +1I incremental cycles to execute, where S,N and I are as defined in section
5.1 Cycle types on page 65.
4.9.5 Assembler syntax
<SWP>{cond}{B} Rd,Rm,[Rn]
{cond} - two-character condition mnemonic, see Figure 6: Condition Codes
{B} - if B is present then byte transfer, otherwise word transfer
Rd,Rm,Rn are expressions evaluating to valid register numbers
4.9.6 Examples
SWP
SWPB
SWPEQ
R0,R1,[R2]
R2,R3,[R4]
R0,R0,[R1]
; load R0 with the contents of R2, and
; store R1 at R2
; load R2 with the byte at R4, and
; store bits 0 to 7 of R3 at R4
; conditionally swap the contents of R1
; with R0
Instruction Set - SWP
49
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