7.5 DATA TRANSMISSION MODES
Bytes can be transmitted between a host and a peripheral device by sending one bit at a time or one byte at a time. These are called, respectively, serial and parallel transmission modes. Each transmission mode establishes a particular communication protocol between the host and the device interface.
7.5.1 Parallel Data Transmission
Parallel communication systems operate in a manner analogous to the operation of a host memory bus. They require at least eight data lines (one for each bit) and one line for synchronization, sometimes called a strobe.
Parallel connections are effective over short distances—usually less than 30 feet—depending on the strength of the signal, the frequency of the signal, and the quality ...
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