Digital Baseband (Dbb) Processor - LG MG180C Service Manual

3. H/W Circuit Description

3.4 Digital Baseband (DBB) Processor

Figure 7. Top level block diagram of the Calypso-
3.4.1. General Description
CALYPSO is a chip implementing the digital base-band processes of a GSM/GPRS mobile phone.
This chip combines a DSP sub-chip (LEAD2 CPU) with its program and data memories, a Micro- -
Controller core with emulation facilities (ARM7TDMIE), internal 8Kb of Boot ROM memory, 4M bit
SRAM memory, a clock squarer cell, several compiled single-port or 2-ports RAM and CMOS gates.
The chip will fully support the Full-Rate, Enhanced Full-Rate and Half-Rate speech coding. CALYPSO
implements all features for the structural test of the logic (full-SCAN, BIST, PMT, JTAG
boundary-SCAN).
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