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3.4.9
Host
An external application may communicate with the g20 through the host connector (J1) and control some or all of the g20's
functions. The host connector enables you to integrate the g20 into an application without installing the g20 inside the product.
The host connector operates in parallel with the developer board peripherals and enables an external application to share g20
resources with the developer board. You may select any g20 function to control externally, through the host connector, and allow
the developer board to control other functions.
You can connect an external application to the g20 Developer Board using a host interconnect flex cable and connecting it to
the host connector (J1). Connect the other end of the cable to the external application. The cable is an optional accessory.
All pin numbers and functions of the host connector are identical to those of the g20 UUT (P1) and the g20 diagnostic connector
(P100). For more information on the pins of the host connector, refer to "UUT Interface Connector" on page 27.
The following are guidelines for using the host connector:
• When using an external SIM card through the host connector, the developer board SIM card jumper (P110) must be discon-
nected and the SIM card tray should be empty.
• When using any of the serial communication channels (USB, RS232, SPI) through the host connector, the developer board
serial connectors should not be used.
• When using the IGN or WAKEUP functions through the host connector, the functions should be switched off on the devel-
oper board Dip switches.
• When using the analog audio channels through the host connector, disconnect all audio devices from the developer board.
• When using the PCM digital audio through the host connector, it is recommended to place the audio selection jumper (P420)
to analog audio mode.
• When connecting an external application that provides the power to the g20 and the Developer Board, remove any other
power sources from the Developer Board.
98-08901C67-O
g20 70-pin
70-pin
Diagnostics Connector
Host Connector
Figure 17. 70-pin Connectors
Developer Board and Interfaces Description
g20 70-pin
Connector
25
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