Dual Sim Card Interface - LG GX300 Service Manual

3.9 Dual SIM Card Interface

The Main Base Band Processor(XMM2130) provides SIM Interface Module.
The XMM2130 checks status Periodically During established call mode whether SIM card is inserted
or not, but it doesn't check during deep sleep mode. In order to communicate with SIM card, 3
signals SIM_IO, SIM_CLK, SIM_RST.
GX300 supports dual SIM mode and each SIM supports 3.0V SIM Card.
SIM interface scheme is shown in (Figure 3.9.1).
SIM_IO, SIM_CLK, SIM_RST ports are used to communicate with Main Chip(AGR+)
Signal
SIM_RST
SIM_CLK
SIM1_IO / SIM2_IO
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Figure 3.9.1. Dual SIM CARD Interface
This signal makes SIM card to HW default status.
SIM card reference clock.
This signal is interface datum.
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
Description
LGE Internal Use Only