Breakpoint
Logic
The
MicroLab
|
contains
breakpoint
circuitry
that
is
used
by
some personality cards
during
the self-test and the
processor-tests.
The breakpoint circuitry
generates
an
interrupt
when
certain
specific
conditions are
met.
There
are
two
separate
types
of
conditions
that
will
trigger
a
breakpoint interrupt:
@
When
a
16-bit
address generated
by
the
personality
card
matches
an
address
stored
in
breakpoint
circuitry.
Additionally,
the
breakpoint circuitry
can detect whether
the address
is
a
memory
or
1/O
address, and whether
the
address
is
being
written
to or
read
from.
@
When
a
pattern
of six
of
the
21
available
processor-
dependent
lines
from
the personality
card
matches
a
pattern stored
in
breakpoint
circuitry.
Address
Latch
ONBDIO
_BSPO-BSP6
Exclusive
OR
Theory
of
Operation—MicroLab
|
Instruction
These
two
types
of
breakpoints
can
also be
used
to
qualify
one another.
A
breakpoint signal can be
generated
by
ANDing
or
ORing
the processor-dependent
and
address
breakpoints,
or
either
breakpoint
can be
selected
independent
of
the
other.
The
interrupts
generated
by
a break condition can be
sent
either
to
the interrupt
handling
logic
on
the
main
interconnect
board,
or
to
the
SPECIAL
line on the
personality card. The
use
of
the
SPECIAL
line
is
entirely
software
controlled.
Overview
Refer to
Fig.
5-5
for
a visual
representation
of
how the
breakpoint
logic
works.
Address
Comparator
BREAKPOINT
Comparator
Fig.
5-5.
Breakpoint
Logic Block
Diagram.
The
breakpoint
logic is
used
during
execution
of
self-test and processor-test routines
by
the personality
card
5-7
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