RM-994/ RM-995/ RM-996
System Module
NOKIA INTERNAL USE ONLY Page 137
Copyright © 2013 Nokia. All rights reserved.
 Device memory
The memory components of the device are internal POP 1GB LPDDR2, a card reader for MicroSD, and 8
GB eMMC memory which is non-removable and internal to the phone.
The MicroSD is used as a user’s data storage memory. The µSD card is connected to MSM which has an
internal level shifter with an ESD protection filter. The μSD card insertion state is detected by a detect
switch connected to MSM8930/ 8230 GPIO94. When the card is moved to remove it, the μSD card is
powered off. Hot swap is supported, which means that the card may be plugged in/out at any time, without
removing the battery.
The device uses 8 GB eMMC (U1800) external memory. The eMMC interface is an 11-wire serial/parallel
data bus which includes a clock (CLK), 8 data signals (DAT), a reset, and command (CMD) wires. The
eMMC interface is made up of the SDC1 bus from the MSM. The eMMC consists of an internal NAND
controller and an MMC controller for I/O interface. It is a dual supply device which requires VCC of 2.95V
for the NAND core and VCCQ of 1.8V for the MMC I/O interface.
Figure 34 eMMC interface
Figure 35 MicroSD connector
 WCN3660 module
The Qualcomm WCN3660 single chip device provides WLAN, BT and FM radio functionality.
WLAN functionality provides full 802.11b, g and n.
The WLAN 2.4GHz transceiver is integrated into the WCN3660 chipset. The WLAN antenna route goes
through the FEM, discrete WLAN/BT RF band pass filter and discrete RF diplexer component. Bluetooth
and WLAN use the same antenna. Transmitting output power level is changed according to data rate. The
highest power level is provided in 802.11b data rates.
The 4-line analog baseband interface for TRX multi-plexing and 5-line digital interface for command and
control are designed between the Nokia BB and the WLAN chipset. WLAN chipset uses a dedicated 48
MHz reference clock, which is generated by external crystal.
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