LG KG270 Service Manual - Page 20
Asynchronous Operation Mode Concept - features of
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3. TECHNICAL BRIEF The security features use the following mechanism: • Boot ROM flow: - Controls the boot transition to external flash - Controls the flash update • Flash tied to the individual chip via an ID using e-fuses, that is, each E-GOLDvoice chip has its own fused ID. Further details on the E-GOLDvoice security concept are not publicly documented. 3.1.16 Asynchronous Operation Mode Concept The E-GOLDvoice can operate in either: • The traditional synchronous mode with the 26MHz system clock synchronized on the base station • A special asynchronous mode (XO concept). In the asynchronous mode the 26MHz clock input is not synchronized with the base station; the residual frequency offset is compensated in the digital signal processing domain. This processing includes frequency and timing compensation of the baseband and voiceband signals. - 21 -