Texas Instruments TMS320C67X/C67X+ DSP manual Mpysu, Multiply Signed 16 LSB y Unsigned 16 LSB

MPYSU Multiply Signed 16 LSB x Unsigned 16 LSB

MPYSU				Multiply Signed 16 LSB y Unsigned 16 LSB
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 1555151 1

Opcode map field used...	For operand type...	Unit	Opfield
src1	slsb16	.M1, .M2	11011
src2	xulsb16
dst	sint
src1	scst5	.M1, .M2	11110
src2	xulsb16
dst	sint

Description

Execution

Pipeline

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.

if (cond)	lsb16(src1) ⋅ lsb16(src2) → dst
else nop

Pipeline

StageE1 E2

Read src1, src2

Writtendst

Unit in use .M

Instruction Type	Multiply (16 ⋅ 16)
Delay Slots	1

3-172 Instruction Set SPRU733