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Clock signal and legend. In electronics and especially synchronous digital circuits, a clock signal (historically also known as logic beat) [1] is an electronic logic signal (voltage or current) which oscillates between a high and a low state at a constant frequency and is used like a metronome to synchronize actions of digital circuits.
Items that should remain consistent are TTL level, a 75ohm output impedance, 75ohm cables and a 75ohm terminating resistor at the end of a chain or cable. Proper termination of the word clock signal with a 75ohm resistor is important. It prevents the clock signal from reflecting back into the cable and causing false detection of extra 1's and 0's.
SCLK CPOL=0 is a clock which idles at the logical low voltage. SCLK CPOL=1 is a clock which idles at the logical high voltage. CPHA represents the phase of each data bit's transmission cycle relative to SCLK. For CPHA=0: The first data bit is output immediately when CS activates. Subsequent bits are output when SCLK transitions to its idle ...
Alternatively, the DTE can provide a clock signal, called transmitter timing (TT, pin 24) for transmitted data. Data is changed when the clock transitions from OFF to ON, and read during the ON to OFF transition. TT can be used to overcome the problem of propagation delay in a long cable. ST must traverse a cable of unknown length and delay ...
After n-CLOCK pulses (rising edges), the data is completely transmitted. With the next CLOCK pulse (rising edge n+1), the sensor output goes to a low level which can be used to detect a short circuit in the cable. If it is high even after n+1 rising edges, then it means that the interface has a short circuit.
The bit clock pulses once for each discrete bit of data on the data lines. The bit clock frequency is the product of the sample rate, the number of bits per channel and the number of channels. So, for example, CD Audio with a sample frequency of 44.1 kHz, with 16 bits of precision and two channels (stereo) has a bit clock frequency of:
The NRZ signal sent is fed with the clock signal through an XOR gate, creating a strobe signal. [20] This strobe is then put through another XOR gate along with the data signal to reconstruct the clock. [20] This in turn acts as the bus's phase-locked loop for synchronization purposes. [20]
The SIPO (Serial Input, Parallel Output) block typically has a receive clock output, a set of data output lines and output data latches. The receive clock may have been recovered from the data by the serial clock recovery technique. However, SerDes which do not transmit a clock use reference clock to lock the PLL to the correct Tx frequency ...