Method and apparatus for interfacing between a radio frequency unit and a modem

A method of interfacing between a mobile station modem and a radio frequency unit equipped for transmitting a frequency hopped signal wherein the interface includes a serial bus interface operably connected to the radio frequency unit including a plurality of bi-directional serial data connections;

• a bi-directional serial data connection for transmitting data for transmission in a first direction from the radio frequency unit and for receiving data at the radio frequency unit;
• a synchronous detector and transmit enabling serial data connection for receiving an enabling indication valid data at the radio frequency unit from an external source, the method including the steps of:
• a) sending a wakeup signal to the radio frequency unit via a serial bus interface;
• and
• b) writing to a first register within the serial interface and control circuitry to set the logic to an idle state.

A method of interfacing between a mobile station modem and a radio frequency unit equipped for transmitting a frequency hopped signal wherein the interface includes a serial bus interface operably connected to the radio frequency unit including a plurality of bi-directional serial data connections;

• a bi-directional serial data connection for transmitting data for transmission in a first direction from the radio frequency unit and for receiving data at the radio frequency unit;
• a synchronous detector and transmit enabling serial data connection for receiving an enabling indication valid data at the radio frequency unit from an external source, the method including the steps of:
• a) enabling a first signal to begin timing;
• b) sending a signal to the radio frequency unit to program a first parameter;
• c) repeatedly designating a next available time slot as either read or write;
• d) reading a predetermined received signal parameter;
• e) transmitting said predetermined parameter by said radio frequency unit to an external destination;
• f) repeating steps c-e until a predetermined status is detected.