Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
The present circuit obtains accurate synchronization with an input data stream from a high speed coaxial link wherein the data stream is coded so that a negative-going transition at the center of a bit cell represents a binary one while a positive-going transition at the center represents a binary zero. In the sync mode, the circuit is phase locked to data transitions. In the async mode, however, it is phase locked to a sync pattern in the data stream. The input data stream on high speed coaxial link 10 is received by shift register 12 having four bit positions D0, D1, D2 and D3. The bit rate of the data stream is 2.36 Mb/s, while the basic clock of the circuit is 14.1523 MHz. Control logic 14 monitors the contents of shift register 12 and controls Johnson counter 16 having three bit positions C0, C1 and C2.