Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 232)

MPYSU Multiply Signed 16 LSB x Unsigned 16 LSB
3-172 Instruction Set SPRU733
Multiply Signed 16 LSB y Unsigned 16 LSB MPYSU
Syntax MPYSU (.unit) src1, src2, dst
.unit = .M1 or .M2
Compatibility C62x, C64x, C67x, and C67x+ CPU
Opcode
31 29 28 27 23 22 18 17 13 12 11 7 6 5 4 3 2 1 0
creg z dst src2 src1 x op 0 0 0 0 0 s p
3 1 5 5 5 1 5 1 1
Opcode map field used... For operand type... Unit Opfield
src1
src2
dst slsb16
xulsb16
sint .M1, .M2 11011
src1
src2
dst scst5
xulsb16
sint .M1, .M2 11110
Description The signed operand src1 is multiplied by the unsigned operand src2. The result
is placed in dst. The S is needed in the mnemonic to specify a signed operand
when both signed and unsigned operands are used.
Execution if (cond) lsb16(src1) × lsb16(src2) → dst
else nop
Pipeline
Stage
E1 E2
Read src1, src2
Written dst
Unit in use .M
Instruction Type Multiply (16 × 16)
Delay Slots 1
Pipeline