User`s manual

Chip Errata

DSP56305 Digital Signal Processor

Mask: 0F13S

DSP56305 Errata  1996 - 2002 Motorola pg. 37 /ng/12/20/02

ED33

Description (added 12/16/98; identified as a Documentation errata

2/1/99):

When Stack Extension mode is enabled, a use of the instructions

BRKcc or ENDDO inside do loops might cause an improper

operation. If the loop is non nested and has no nested loop inside

it, the erratais relevant only if LA or LC values are being used

outside the loop.

Workaround:

If Stack Extension is used, emulate the BRKcc or ENDDO as in the

following examples. We split between two cases, finite loops and do

forever loops.

1) Finite DO loops (i.e. not DO FOREVER loops)

==============================================

BRKcc

Original code:

do #N,label1

.....

do #M,label2

.....

BRKcc

.....

label2

.....

label1

Will be replaced by:

do #N, label1

.....

do #M, label2

.....

Jcc fix_brk_routine

.....

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