User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

Modes of Operation

The 9XStream wireless module features several modes of operation that allow

the module to be responsive to data and yet utilize minimum power. The

figure below shows these modes, followed by a comprehensive look into each

and the necessary conditions for the 9XStream module to transition from one

mode to another.

Figure 4

Idle Mode

The 9XStream module operates in Idle Mode when there is no data being

transmitted or received. The module transitions to Transmit Mode once data

is presented on the DI pin. If valid data is detected at the antenna, the module

will switch from Idle Mode to Receive Mode. When no longer transmitting

or receiving, the module returns to Idle Mode.

Transmit Mode

When the first byte arrives in the data buffer through the DI pin, the module

leaves Idle Mode and transitions to Transmit Mode. This transition happens

instantaneously from the moment the first byte of data arrives in the data

buffer. In Transmit Mode, a header is sent out and is followed by the first

data packet, which has a CRC (Cyclic Redundancy Check) attached (see the