Analog Devices ADSP-BF53x Blackfin Reference page 731

• is set if result in Accumulator
AV1
cleared if
• is set if
AV1S
• All other flags are unaffected.
The ADSP-BF535 processor has fewer
operate differently than subsequent Blackfin family products. For
more information on the ADSP-BF535 status flags, see
on page
Example
Result is 40-bit Accumulator
a1=r2.l*r3.h, a0=r2.h*r3.h ;
/* both multiply signed fractions into separate Accumulators */
a0=r1.l*r0.l, a1+=r1.h*r0.h ;
/* same as above, but sum result into A1. MAC order is arbitrary.
*/
a1+=r3.h*r3.l, a0-=r3.h*r3.h ;
/* sum product into A1, subtract product from A0 */
a1=r3.h*r2.l (m), a0+=r3.l*r2.l ;
/* MAC1 multiplies a signed fraction in r3.h by an unsigned frac-
tion in r2.l. MAC0 multiplies two signed fractions. */
a1=r7.h*r4.h (m), a0+=r7.l*r4.l (fu) ;
/* MAC1 multiplies signed fraction by unsigned fraction. MAC0
multiplies and accumulates two unsigned fractions. */
a1+=r3.h*r2.h, a0=r3.l*r2.l (is) ;
/* both MACs perform signed integer multiplication */
a1=r6.h*r7.h, a0+=r6.l*r7.l (w32) ;
/* both MACs multiply signed fractions, sign extended, and satu-
rate both Accumulators at bit 31 */
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
result does not saturate.
A1
is set; unaffected otherwise.
AV1
A-3.
Vector Operations
(MAC1 operation) saturates;
A1
flags and some flags
ASTAT
Table A-1
19-43