Host Usb Driver Requirements; Led Output; Figure 20: Example Led - Sierra Wireless MC5720 Hardware Integration Manual

Host USB driver requirements

The following are critical requirements that must be met by the USB driver on
the host device:
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LED output

The MiniCard Drives the LED output according to the PCI-Express MiniCard
specification.
Figure 9: Example LED
Rev 1.2
A p r - 0 5
The host USB driver must support remote wakeup, resume, and suspend
operations as specified by the USB specification. (See the Compaq, Intel,
Microsoft, and NEC Universal Serial Bus Specification.)
If the control port is communicated over the USB interface, the host USB
driver must be able to receive both HI and DM messages and route DM
messages out to diagnostic tools via another port (another host UART or
USB port running at 115.2 kbps minimum). (See the Host Modem Interface
Control Port ICD.)
The host USB driver must support serial port emulation.
The host USB driver must not send any SOF tokens (start-of-frames) to the
modem when it doesn't have any valid data to send. This messaging will
keep the module awake and cause unnecessary power consumption.
Current limiting Resistor
MiniCard
MIO
P r o p r i e t a r y a n d c o n f i d e n t i a l
VCC 3.3V
LED
H o s t I n t e r f a c e
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