4Links Diagnostic SpaceWire Interface DSI-RG408, User Manual, Page: 40 / 130

Diagnostic SpaceWire Interface
EtherSpaceLink family User Manual
14. Opt i ons O D a n d OE - Output Di s a ble a n d Output En a ble
Fr om DS I f ir m wa r e v 21, t h e DS I p r ov id e s t h e capa b i l i t y to dis a ble a ll o f i t s S pac e W ir e out p ut sig n a l s i n
r
e
s p
on
s
e to
a
n
i
n
p
ut lo
gi c sig
n
a
l on one o
f i
t
s r
e
a r -pa
nel S
MA c
onne
c
to
r pa irs
.
I
n
c
onjun
c
t
i
on
w i
t
h
mon i to ri n g ha rd wa r e o r s o f t wa r e , t ha t d ete c t s a nom a l i e s w i t h i n a w id e r E G S E , t h e s e o p t i on s ca n be
u
s
e
d
to
p r
ov
id
e
f
u
r
t
h
e
r p r
ote
c
t
i
on to
d
el
i ca
te o
r
v
a
lu
a
ble S
pac
e
W ir
e
ha rd wa r
e.
Th e O ut p ut D is a ble o p t i on ( O D) r e s p on ds to a h ig h- level i n p ut sig n a l on S MA c onne c to r pa ir J 3 - J 4 , a n d
t
ri - s
t
a
te
s
t
h
e S
pac
e
W ir
e
p
o
r
t
s
.
Wh
en J
3 -
J
4 is
not
dri
ven
,
t
h
e DS
I
be
ha
ve
s a s i
t no
r
m
a
ll
y w
oul
d w i
t
h
out
t h is o p t i on. W i t h t h e O D o p t i on , t h e ex is t i n g J 3 - J 4 f un c t i on s r em a i n un cha n g e d ; e. g . t h e DS I ca n s t i ll
t
rigg
e
r a
n event
wa
ve
f
o
r
m
cap
tu
r
e
wh
en t
h is sig
n
a
l
is r a is
e
d
.
Th
e
dr aw
b
ack
to t
h
e
O
ut
p
ut D
is a
ble
c on f ig u r a t i on is t ha t a b r o k en o r dis c onne c te d ca ble w i ll not be d ete c te d .
Th
e
O
ut
p
ut
E
n
a
ble o
p
t i on (
OE
) onl
y
en
a
ble s t
h
e S
pac
e
W
ir e out
p
ut s
wh
en
a h
ig
h-
level i n
p
ut sig n
a
l is
p r
e
s
ent on S
MA c
onne
c
to
r pa ir
J
3 -
J
4 ,
m
ak i
n
g i
t
fa i
l
s af
e
i
n t
h
e
fac
e o
f a
b
r
o
k
en en
a
ble
sig
n
a
l
c
onne
c
t i on.
Th
e dr
aw
b
ack
to t
h
is o
p
t i on is t
ha
t t
h
e DS I
w
i ll
app
e
a
r i ne r t unle ss J 3
-
J
4
is dri ven
h
ig
h
,
wh i ch is a
non
- s
t
a
n
d a rd
be
ha
v
i
ou
r
.
W i
t
h
t
h
e
OE
o
p
t
i
on
,
t
h
e ex
is
t
i
n
g
J
3 -
J
4 f
un
c
t
i
on
s
m
ay
be u
s
e
d w i
t
h
r eve rs e d
p
ol
a
ri t
y
; t
h
e DS I t rigg e rs
a
n event
wa
ve
f
o r m
cap
tu r e
wh
en t
h
e i n
p
ut sig n
a
l
fa
ll s .
Th
e
O
D
a
n
d OE
o
p
t
i
on
s i
n
di ca
te “
- 3
S
-
” on t
h
e DS
I
un
i
t
’s f r
ont
pa
nel
dis p
l
ay wh
en
i
t
s
S
pac
e
W ir
e
out p ut s a r e t ri - s t a te d . Th is is s h o w n i n f ig u r e 1 4 . 1 .
Fig u r e 1 4. 1: Th e DS I ’ s f r ont pa ne l d i s play i n d i ca te s t ha t i t s out p ut s a r e d i s abl e d
Th
e
s
e o
p
t
i
on
s a r
e
p r
ov
id
e
d f
o
r
DS
I
un
i
t
s wh i ch a
l
s
o
p r
ov
id
e t
h
e “
-M
“
E
xt
r a R
e
s
ou
r c
e
s a
n
d
“
-
S“
r
e
a r
S MA c onne c to r f e a tu r e s .
Th
e
h ig h
level on S
MA c
onne
c
to
r pa ir
J
3 -
J
4 s h
oul
d
be m
a i
nt
a i
ne
d a
t +
1 V
. Det
a i
l
s
o
f
t
h
e S
MA
c onne c to rs a r e p r ov id e d i n s e c t i on 3 . 3, “S MA S y n ch r on i za t i on C onne c to rs ”. Th e c ont r ol sig n a l s h oul d
be te
r
m
i
n
a
te
d i
n 50
Ω
(
a
n
d
u
s
e 50
Ω ca
ble
s,
et
c
.) to
p r
event
s p
u
ri
ou
s
en
a
ble/
dis a
ble t
r a
n
si
t
i
on
s
.
C le a r l y , t h e OE o p t i on is mutu a ll y i n c om pa t i ble w i t h t h e O D o p t i on.
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