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ARM INSTRUCTION SET S3C2440A RISC MICROPROCESSOR
3-52
INSTRUCTION CYCLE TIMES
Coprocessor data operations take 1S + bI incremental cycles to execute, where b is the number of cycles spent in
the coprocessor busy-wait loop.
S and I are defined as sequential (S-cycle) and internal (I-cycle).
Assembler syntax
CDP{cond} p#,<expression1>,cd,cn,cm{,<expression2>}
{cond} Two character condition mnemonic. See Table 3-2.
p# The unique number of the required coprocessor
<expression1> Evaluated to a constant and placed in the CP Opc field
cd, cn and cm Evaluate to the valid coprocessor register numbers CRd, CRn and CRm respectively
<expression2> Where present is evaluated to a constant and placed in the CP field
EXAMPLES
CDP p1,10,c1,c2,c3 ; Request coproc 1 to do operation 10
; on CR2 and CR3, and put the result in CR1.
CDPEQ p2,5,c1,c2,c3,2 ; If Z flag is set request coproc 2 to do operation 5 (type 2)
; on CR2 and CR3, and put the result in CR1.