GF82.00-P-2000TX Data Transfer, Function

GF82.00-P-2000TX Data Transfer, Function

Data transfer in MOST
The audio gateway control unit (N93/1) makes it possible to provide all the information on the interior CAN (CAN-B) to each respective component on the MOST ring. It acts as an interface (gateway). This is where the incoming signals are converted so that they can be transmitted to the interior CAN and back by the MOST ring. The electrical impulses are converted into light pulses and back again by means of the optical transmitter and receiver diodes, which are integrated into every MOST component. The audio gateway controls the timing with which the blocks of information are transmitted on the MOST ring. A block consists of 16 data frames. Source data (voice, video, etc.) are transmitted synchronously and control data (commands, etc.) are transmitted asynchronously in a data frame.

The sequence of many data frames then contains the complete information for the operation of the components on the MOST ring. Data frames are transmitted from one component to the next on the MOST ring. They each have an address (Code) that indicates the MOST ring component for which the information is intended. In the component the information is read in by the receiver (RX), the address is checked, and if it does not match the address of the component it is put back onto the MOST ring by the transmitter (TX) and is forwarded to the next component.

Data frames arriving at the component are assembled into information units and processed.
The transmit and receive units are switched into readiness mode if they are not required (data frames) in order to reduce the amount of quiescent current consumption (sleep mode).
They are switched back into operating mode by an optical wake up signal.