Texas Instruments TMS320C67X/C67X+ DSP manual Unit Constraints

Functional Unit Constraints

4.3.2.M-Unit Constraints

Table 4−24 shows the instruction constraints for 16 ⋅ 16 multiply instructions executing on the .M unit.

Table 4−24. 16 y 16 Multiply .M-Unit Instruction Constraints

				Instruction Execution
Cycle		1	2	3
16 ⋅ 16 multiply		R	W
Instruction Type			Subsequent Same-Unit Instruction Executable
16 ⋅ 16 multiply			n	n
4-cycle			n	n
MPYI			n	n
MPYID			n	n
MPYDP			n	n
Instruction Type		Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle			n	n
Load			n	n
Store			n	n
DP compare			n	n
2-cycle DP			n	n
Branch			n	n
4-cycle			n	n
INTDP			n	n
ADDDP/SUBDP			n	n
	= E1 phase of the single-cycle instruction; R = Sources read for the instruction; W = Destinations written for the
Legend:

instruction; n = Next instruction can enter E1 during cycle

4-40 Pipeline SPRU733