Texas Instruments TMS320C67X/C67X+ DSP manual MPY, Mpysp, Pipeline E10 Stage Read

MPYDP Multiply Two Double-Precision Floating-Point Values
Pipeline
	Pipeline	E1	E2	E3	E4	E5	E6	E7	E8	E9	E10
	Stage
	Read	src1_l src1_l src1_h			src1_h
		src2_l	src2_h	src2_l src2_h
	Written									dst_l	dst_h
	Unit in use	.M	.M	.M	.M

If dst is used as the source for the ADDDP, CMPEQDP, CMPLTDP, CMPGTDP, MPYDP, or SUBDP instruction, the number of delay slots can be reduced by one, because these instructions read the lower word of the DP source one cycle before the upper word of the DP source.

Instruction Type		MPYDP
Delay Slots		9
Functional Unit		4
Latency
See Also		MPY, MPYSP
Example		MPYDP .M1 A1:A0,A3:A2,A5:A4
	Before instruction					10 cycles after instruction
A1:A0
	4021 3333h		3333 3333h	8.6	A1:A0	4021	3333h	4021	3333h	8.6
A3:A2	C004 0000h		0000 0000	−2.5	A3:A2	C004	0000h	0000	0000h	−2.5
A5:A4	XXXX XXXXh		XXXX XXXXh		A5:A4	C035	8000h	0000	0000h	−21.5

3-146 Instruction Set SPRU733