Texas Instruments TMS320C67X/C67X+ DSP - Manual (Page 203)

Multiply Signed 16 LSB x Signed 16 LSB MPY
3-143 Instruction Set SPRU733
Multiply Signed 16 LSB y Signed 16 LSB MPY
Syntax MPY (.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
xslsb16
sint .M1, .M2 11001
src1
src2
dst scst5
xslsb16
sint .M1, .M2 11000
Description The src1 operand is multiplied by the src2 operand. The result is placed in dst.
The source operands are signed by default.
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
See Also MPYU, MPYSU, MPYUS, SMPY
Pipeline