TMS320C80GF datasheet(61/171 Pages) TI

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TMS320C80

DIGITAL SIGNAL PROCESSOR

SPRS023B – JULY 1994 – REVISED OCTOBER 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

ALU-operation code

For base-set ALU Boolean opcodes (A=0), the ALU function is formed by a sum of Boolean products selected

by the ALU operation opcode bits as shown in Table 18. For base-set arithmetic opcodes (A=1), the four odd

ALU operation bits specify an arithmetic operation as described in Table 19 while the four even bits specify one

of the ALU function modifiers as shown in Table 20.

Table 18. Base-Set ALU Boolean Function Codes

OPCODE BIT

PRODUCT TERM

A & B & C

~A & B & C

A & ~B & C

~A & ~B & C

A & B & ~C

~A & B & ~C

A & ~B & ~C

~A & ~B & ~C

Table 19. Base-Set Arithmetics

OPCODE BITS

CARRY

ALGEBRAIC DESCRIPTION

NATURAL

MODIFIED FUNCTION

(IF DIFFERENT FROM

ALGEBRAIC DESCRIPTION

FUNCTION

(IF DIFFERENT FROM

NATURAL FUNCTION)

A – (B | C)

A – B <1<

A + (B & ~C)

A + B <0<

A – C

A – (B | ~C)

A – B >1>

(A – (B & C)) if sign=0

A – B

C(n)

A – (B & @mf | –B & ~@mf)

A + B / A – B

if class 0 or 5

1/0

A + |B|

A + B / A – B

if class 1–4 or 6–7, A–B if sign=1

A – (B & C)

A – B>0>

A + (B & C)

A + B>0>

~C(n)

A + (B & @mf | –B & ~@mf)

A – B / A + B

if class 0 or 5

0/1

A – |B|

A – B / A + B

if class 1–4 or 6–7, A+B if sign=1

A + B

A + (B | ~C)

A + B >1>

(A + (B & C)) if sign=0

A + C

A – (B & ~C)

A – B <0<

A + (B | C)

A + B <1<

(A & C) + (B & C)

field A + B

Legend:

C(n)

LSB of each part of C port register

>0>

Zero-extend shift right

<0<

Zero-extend shift left

>1>

One-extend shift right

<1<

One-extend shift left

TMS320C80GF Datasheet(PDF) 61 Page - Texas Instruments

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