Start-Up Timing Sequence - Fibocom L850-GL Series Hardware Manual

3.3.1.2 Start-up Timing Sequence

When power supply is ready, the PMU of module will power on and start initialization process by pulling
high FCPO# signal. After about 10s, module will complete initialization process. The start-up timing is
shown in Figure 3-5:
+3.3V
FCPO#
RESET#
PERST#
Module State
Index Min. Recommended Max.
t 0ms
-
pr
t 8ms
20ms
on1
t 50ms 100ms
on2
The minimum detection time of PCIe link is about 45ms after PERST# de-asserted.
Note：
When USB is used as data transfer interface, follow timing above in PERST# connecting with
host, otherwise don't control PERST# in PERST# floating condition.
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FIBOCOM L850-GL Series Hardware Guide
Figure 3-4 Circuit for module start-up controlled by AP
t
pr
t
on
1
t
on
2
OFF
Figure 3-5 Timing control for start-up
Comments
The delay time of power supply rising from 0V up to
-
3.135V. If power supply always ready, it can be ignored
- RESET# should be de-asserted after FCPO#
The time delay of PERST# de-asserted after FCPO#,
-
PERST# must always be the last to get de-asserted
typical 10s
Initialization Activation(AT Command Ready)
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