TMS320F datasheet(75/389 Pages) TI

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Conditional Branches, Calls, and Returns

5-11

Program Control

- Group 2. You can select up to three conditions. Each of these conditions

must be from a different category (A, B, or C); you cannot have two condi-

tions from the same category. For example, you can test TC, C, and BIO

at the same time, but you cannot test C and NC at the same time.

Table 5–4. Groupings of Conditions

Group 1

Group 2

Category A

Category B

Category A

Category B

Category C

BIO

NEQ

NOV

NTC

LEQ

GEQ

5.4.2

Stabilization of Conditions

A conditional instruction must be able to test the most recent values of the sta-

tus bits. Therefore, the conditions cannot be considered stable until the fourth,

or execution stage of the pipeline, one cycle after the previous instruction has

been executed. The pipeline controller stops the decoding of any instructions

following the conditional instruction until the conditions are stable.

5.4.3

Conditional Branches

A branch instruction transfers program control to any location in program

memory. Conditional branch instructions are executed only when one or more

user-specified conditions are met (see Table 5–3 on page 5-10). If all the

conditions are met, the PC is loaded with the second word of the branch

instruction, which contains the address to branch to, and execution continues

at this address.

By the time the conditions have been tested, the two instruction words follow-

ing the conditional branch instruction have already been fetched in the pipe-

line. If all the conditions are met, these two instruction words are flushed from

the pipeline so that they are not executed, and then execution continues at the

branched-to address. If the conditions are

not met, the two instruction words

are executed instead of the branch. Because conditional branches use condi-

tions determined by the execution of the previous instructions, a conditional

branch takes one more cycle than an unconditional one.

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