Xim Interface; Table 32: Xim Pins - Sierra Wireless MC5720 Hardware Integration Manual

P C I E x p r e s s M i n i C a r d H a r d wa r e I n t e g r a t i o n G u i d e

XIM Interface

The EM is designed to support one SIM (Subscriber Identity Module) or RUIM
(Removable User Identity Module). SIM is a smart card developed for GSM
networks while RUIM is for CDMA cellular systems. Each provides personal
user information that allows a mobile to attach to the wireless network. The XIM
feature provides the user with handset independence.
There are four required and one optional signals in the XIM interface. These are
defined in Table 5 with an example circuit (EM3420) shown in Figure 10.
Some EM models contain the voltage regulator for the XIM interface, while
others provide an enable signal. See the EM Reference Guide for your EM
model for details.
Table 5: XIM pins
Pin name
XIM_VCC
/XIM_RESET
XIM_CLK
XIM_DATA
3 4
RUIM pin Function
number
1 XIM VCC
2 Active low XIM reset
3 Serial clock for XIM data.
4 Bi-directional XIM data line
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 2 1 3 X X X X