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Dual-mode mobile terminal having mode switching circuit

A mobile terminal, dual-mode technology, applied in radio/induction link selection arrangements, electrical components, transmission systems, etc., to solve problems such as low output, modem chip activation, etc.

Active Publication Date: 2005-07-27
PANTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if when either mode is deactivated, the output of the DPRAM which is in a power-off or sleep state and connected to the interrupt terminal of the modem chip goes low, there may be a failure which inevitably causes the modem chip to be activated

Method used

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  • Dual-mode mobile terminal having mode switching circuit
  • Dual-mode mobile terminal having mode switching circuit
  • Dual-mode mobile terminal having mode switching circuit

Examples

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Embodiment Construction

[0014] Hereinafter, several embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0015] figure 2 is a block diagram showing the connection of the CPU and the modem in the dual-mode mobile terminal according to the present invention.

[0016] In the present invention, an interface unit 251 is provided between the signal lines 21 and 41 provided between the first DPRAM 201 and the first modem 301, and between the signal lines 22 and 42 provided between the second DPRAM 202 and the second modem 302. An interface unit 252 is provided between them. In addition, similar to a conventional dual-mode mobile terminal, the remaining signal lines 31 and 32 are directly connected between the first DPRAM 201 and the first modem 301, and between the second DPRAM 202 and the second modem 302, respectively.

[0017] The interface units 251 and 252 also function to output stable signals to the modems 301 and 302 even if the output si...

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Abstract

Disclosed herein is a dual-mode mobile terminal, which performs switching between modes in a manner that prevents the occurrence of interference between parts for respective modes when a central processing unit and modems communicate with each other using dual-port random access memories in a mobile communication terminal that use a single central processing unit and a plurality of modem chips. In the dual-mode mobile terminal of the present invention, dual-port random access memories (DPRAMs) are provided between CPU and modems, respectively. Each DPRAM has a first port connected to a signal bus extending from the CPU and a second port connected to a signal bus extending from a corresponding modem so as to exchange data between the CPU and the modem. The interface units perform a control operation 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 interface units can be implemented with logic gates, and the part of signals include an interrupt signal allowing each modem to be released from a sleep state.

Description

technical field [0001] The present invention generally relates to a dual-mode mobile terminal with a mode conversion circuit and a mode conversion method using the mobile terminal, and in particular to a dual-mode mobile terminal, when a central processing unit and a modem are used in a dual-port mobile communication terminal When random access memories communicate with each other, it performs switching between modes in a manner that prevents interference between various mode parts, and the mobile communication terminal uses a single central processing unit and a plurality of modem chips. Background technique [0002] A mobile terminal capable of being used in both a Code Division Multiple Access (CDMA) network and a Wideband Code Division Multiple Access (WCDMA) network is called a dual mode mobile terminal. The dual-mode mobile terminal has radio frequency (RF) circuitry and modem for CDMA, and RF circuitry and modem for WCDMA, so that the dual-mode mobile terminal can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/16H04W88/06
CPCH04W88/06H04B1/40
Inventor 李冬一李炯一郑民教
Owner PANTECH CO LTD
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