LG -P970 Service Manual page 51

• Several individual blocks on top level: including
– The UMTS System Interface (USI), consisting of the the UMTS Timer used for highly accurate interrupt and
trigger generation for the L1 FW, UMTS HW peripherals, AGC, and the Control Sequencer, used to process
more complex trigger and switching sequences (e.g. typical RF control sequences) which are programmed by
firmware into a sequence RAM. A sequence is started manually or via a trigger signal from the UMTS Timer
– The 3G Control Unit (3GCU) consisting of System Control Unit (3G-SCU), System Power Control Unit (3GSPCU)
and Clock Generation Unit (3G-CGU) for the 3.5G subsystem.The 3GCU is responsible for the control of the 3G
subsystem. It is tightly coupled to the Master Chip Control Functions of the 2G subsystem in the X-GOLD™618.
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3. TECHNICAL BRIEF
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