Dual-mode mobile terminal having a mode switching circuit
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United States of America Patent
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Issued Date -
Aug 18, 2005
app pub date -
Jan 14, 2005
filing date -
Jan 16, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A dual-mode mobile terminal is disclosed in which a switching between the modes is performed. The dual-mode mobile terminal of the present invention is implemented with a single CPU, two or more dual-port randon access memories (DPRAMs) and two or more MODEMs along with interface units (IUs) that prevents the occurrence of interference between parts for respective modes when the CPU and the MODEMs communicate with each other via the DPRAMs in a mobile communication terminal that use a single central processing unit and a plurality of modem chips. The IUs perform control operations so that part of signals to be applied to each of the MODEMs is/are applied only when an activation signal for the MODEM is enabled. The IUs may be implemented with logic gates, and the part of signals include an interrupt signal allowing each MODEM to be released from a sleep state.
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