Redpine Signals, Inc.
Page 67
R
R
S
S
-
-
W
W
C
C
-
-
3
3
0
0
1
1
E
E
v
v
a
a
l
l
u
u
a
a
t
t
i
i
o
o
n
n
B
B
o
o
a
a
r
r
d
d
U
U
s
s
e
e
r
r
G
G
u
u
i
i
d
d
e
e
V
V
e
e
r
r
s
s
i
i
o
o
n
n
2
2
.
.
5
5
1
1
Meanwhile, the Host can keep polling the signal WF_HNDSHKE2. After the
upgrade process is over, the module will set the signal to high and will
set it again to high or low depending on whether the upgrade was
successful, after a delay of 1 msec after the first pulse. This process
would confirm the final upgrade status to the Host. The module can now
be power cycled for normal operation (WF_HNDSHKE1 should be kept „0‟
in normal operation)
Figure 17: Signal Status During Firmware Upgrade
After the confirmation, the module should be power cycled and
operated normally thereafter.
WF_HNDSHKE1
WF_HNDSHKE2
1-Upgrade success
0-Upgrade failure.
Try again after
fresh power cycle
Upgrade in progress
First pulse
after
upgrade
completion
Host waits
for 1 msec
