Em Asic N2300; Device Memories; Combo Memory - Nokia N72 Service Manual

RM-180
System Module
• Battery voltage monitoring
• 32.768 kHz clock with external crystal
• Real time clock with external backup battery
• SIM card interface
• Stereo audio codecs and amplifiers
• A/D converter
• Regulators
• Vibra interface
• Digital interface (CBUS)

EM ASIC N2300

EM ASIC N2300 includes the following functional blocks:
• Core supply generation
• Charge control circuitry
• Level shifter and regulator for USB/FBUS
• Current gauge for battery current measuring
• External LED driver control interface
• Digital interface (CBUS)
• Accessory supply voltage regulator
• Vout - accessory

Device memories

RAP memories NOR flash and SDRAM
The modem memory consists of 64 Mbit SDRAM and 64 Mbit NOR flash memories.
SDRAM is a dynamic memory for ISA (Intelligent Software Architecture) SW.
NOR is used for ISA SW code and PM data and CDSP (Cellular Digital Signal Processor) SW code.

Combo memory

The application memory of the device consists of NAND/DDR combo memory. The stacked DDR/NAND
application memory has 512 Mbits of DDR memory and 512 Mbits of flash memory. DDR DRAM memory is
stacked above the NAND flash.
Both NAND core and I/O voltages are 1.8 V generated by VIO.
Parameter Symbol
Supply VBAT
voltage
Combo Vore
memory
core
voltage
Issue 1
Table 20 Supply voltages for combo memory interfaces
min max
1.65 1.95
COMPANY CONFIDENTIAL
Copyright © 2006 Nokia. All rights reserved.
unit note
V Battery
voltage
V Nominal
1.8V s
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