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V 1.0 Page 25of 52 ICM MP CCQ GRM
SL55
Company Confidential © Copyright Siemens AG
06/03
The DSP part contains:
· DSP signal processor
· Separate program/data memory
· a hardware block for processing the RX signal,
· a hardware block for “ciphers“,
· a hardware block for processing the linguistic signal,
· a hardware block for the “GMSK modulator“,
· De-/ interleaving memory,
· Communication memory
· a PLL for processing and reproducing the VCXO pulse signal.
In the DSP Firmware are implemented the following functions:
· scanning of channels, i.e., measurement of the field strengths of neighbouring base
stations
· detection and evaluation of Frequency Correction Bursts
· equalisation of Normal Bursts and Synchronisation Bursts
· channel encoding and soft-decision decoding for fullrate, enhanced-fullrate and
adaptive multirate speech, fullrate and halfrate data and control channels.
· channel encoding for GPRS coding
· fullrate, enhanced fullrate and adaptive multirate speech encoding and decoding
· mandatory sub-functions like
– discontinuous transmission, DTX
– voice activity detection
– background noise calculation
· generation of tone and side tone
· hands-free functions
· support for voice memo
· support for voice dialling
· loop-back to GSM functions
· GSM Transparent Data Services and Transparent Fax
· calculation of the Frame Check Sequence for a RLP frame used for GSM
NonTransparent Data Services
· support of the GSM ciphering algorithm
Real Time Clock (integrated in the EGOLD+):
The real time clock is powered via a separate voltage regulator inside the Power Supply
ASIC (
D361 pin A5). Via a capacitor C374, data are kept in the internal RAM during a
battery change for at least 30 seconds. An alarm function is also integrated with the
possibility to switch the phone on.
5.1.4 SRAM
Memory for volatile data
Memory Size: 8 Mbit + 2Mbit SRAM internal EGOLD+ V3.1
Data Bus: 16Bit
5.1.5 FLASH
Memory Size: 64Mbit (8 Mbyte)
Data Bus: 16 Bit
5.1.6 SIM
SIM cards with supply voltages of 1.8V and 3V are supported.
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