User Guide

MicroSD interface

The MicroSD card interface is electrically and functionally compatible with SD card interface. SD card interface

is a 1-bit serial IF connected to RAP.

IF includes 1.8V-2.85V level shifter and 2.85V LDO regulator (combined into one package) and an SD ASIP.

Card detection is implemented by using a transistor switch connected to data3 pin of microSD card. There is

an internal switch in the card reader for card insertion and removal detection. The removal detection signal

is connected to GenIO47.

Figure 71 MicroSD interface

Table 12 MicroSD Interface

Pin Signal I/O Engine connection Notes

1 DATA2 <-> NC NC Reserved for future use

2 DATA3 -> RAP GENIO42 Card detection logic

3 CMD <-> RAP GENIO09 Command/Response

4 VDD <- N3200 VMMC VMMC supply voltage (Max

150mA)

5 CLK <- RAP GENIO13 External clock for SD card, Max

19MHz

6 GND GND Ground

7 DATA0 <-> RAP GENIO08 Bi-directional data bus

A DATA1 <-> NC NC Reserved

9 SW -> GND Detection switch GND

10 DELAY -> RAP GENIO47 Card removal/insertion detect

RM-170; RM-171

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