The SIM (Subscriber Identification Module) interface is located in two ASICs; Cellular Modem ASIC D2800
contains most of the interface functionality and the mixed signal ASIC N2200 takes care of power up/down,
card detect, ATR counting and level shifting. ESD protection components are integrated to N2200 ASIP.
Figure 45 SIM interface
SD card interface
Memory card interface is compliant with the MultiMediaCard Specification version 4.x, the SD Memory Card
Specification, Physical Layer Specification version 2.00 and Secure Digital Input/Output Card Specification,
The host in the SD card interface is application ASIC D4800. SD card transceiver/level shifter is in application
side mixed signal IC (N4200). There are four data signals, one command signal and a clock output signal
going in N4200. For transceiver control, there are direction signals to each data signals and one also for CMD.
A feedback clock is coming from transceiver to host. Memory card transceiver is controlled by D4800 I2C_APE.
Clock frequency used is 24MHz. ESD protection is implemented with an ESD ASIP, Z5200.
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