Texas Instruments TMS320C67X/C67X+ DSP manual Unit Constraints, Instruction Execution

Functional Unit Constraints

4.3.1.S-Unit Constraints

Table 4−18 shows the instruction constraints for single-cycle instructions executing on the .S unit.

Table 4−18. Single-Cycle .S-Unit Instruction Constraints

		Instruction Execution
Cycle	1	2
Single-cycle	RW
Instruction Type		Subsequent Same-Unit Instruction Executable
Single-cycle		n
DP compare		n
2-cycle DP		n
ADDDP/SUBDP		n
ADDSP/SUBSP		n
Branch		n
Instruction Type	Same Side, Different Unit, Both Using Cross Path Executable
Single-cycle		n
Load		n
Store		n
INTDP		n
ADDDP/SUBDP		n
16 ⋅ 16 multiply		n
4-cycle		n
MPYI		n
MPYID		n
MPYDP		n

Legend:		= E1 phase of the single-cycle instruction; R = Sources read for the instruction; W = Destinations written for the
	instruction; n = Next instruction can enter E1 during cycle
4-34		Pipeline	SPRU733