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

Page 372
Image 372
Texas Instruments TMS320C67X/C67X+ DSP manual Unit Constraints, 24 y 16 Multiply .M-Unit Instruction Constraints