Patent ID: 6662238
Filing Date: 2003-12-09
Classification: H04L

Abstract:
An integrated modem and line-isolation circuit with modem command mode and data mode control, comprising:system-side line-isolation circuitry capable of being coupled to an isolation barrier; digital signal processing (DSP) circuitry integrated with the system-side line-isolation circuitry, the DSP circuitry having a modem processor for modem data and a digital processor for system-side circuitry; and an asynchronous serial communication interface coupled to the DSP circuitry and configured to be coupled to an external system-side device, the asynchronous serial communication interface including a serial input pin configured to receive an M-bit word, wherein M-minus-N bits of the M-bit word are data bits and N-bits of the M-bit word are control bits, the control bits identifying whether the modem processor should process the M-minus-N bits of the M-bit word in command mode or in data mode.