Samsung YP-P10 User Manual download pdf (Page 110)

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101

ARM INSTRUCTION SET S3C2440A RISC MICROPROCESSOR

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OPERAND RESTRICTIONS

• R15 must not be used as an operand or as a destination register.

• RdHi, RdLo, and Rm must all specify different registers.

CPSR FLAGS

Setting the CPSR flags is optional, and is controlled by the S bit in the instruction. The N and Z flags are set

correctly on the result (N is equal to bit 63 of the result, Z is set if and only if all 64 bits of the result are zero). Both

the C and V flags are set to meaningless values.

INSTRUCTION CYCLE TIMES

MULL takes 1S + (m+1)I and MLAL 1S + (m+2)I cycles to execute, where m is the number of 8 bit multiplier array

cycles required to complete the multiply, which is controlled by the value of the multiplier operand specified by Rs.

Its possible values are as follows:

For Signed INSTRUCTIONS SMULL, SMLAL:

• If bits [31:8] of the multiplier operand are all zero or all one.

• If bits [31:16] of the multiplier operand are all zero or all one.

• If bits [31:24] of the multiplier operand are all zero or all one.

• In all other cases.

For Unsigned Instructions UMULL, UMLAL:

• If bits [31:8] of the multiplier operand are all zero.

• If bits [31:16] of the multiplier operand are all zero.

• If bits [31:24] of the multiplier operand are all zero.

• In all other cases.

S and I are defined as sequential (S-cycle) and internal (I-cycle), respectively.

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Samsung YP-P10 User Manual Page 110

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