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When the EPCI is initialized into the synchronous mode, the receiver first enters the hunt mode on a o t0 1 transition of RxEN (CR2). In this mode, as data are shifted into the receiver shift register a bit at a time, the contents of the register are compared to the contents of the SYNl register. If the two are not equal, the next bit is shifted in and the comparison is repeated. When the two registers match, the hunt mode is terminated and character assembly mode begins. If single SYN operation is programmed, the SYN DETECT status bit is set. If double SYN operation is programmed, the first character assembled after SYNl must be SYN2 in order for the SYN DETECT bit to be set. Otherwise, the EPCI returns to the hunt mode. (Note that the sequence SYNl-SYNl-SYN2 will not achieve synchronization.) When synchronization has been achieved, the EPCI continues to assemble characters and transfer then to the holding register, setting the RxRDY status bit and asserting the RxRDY output each time a character is transferred. The PE and OE status bits are set as appropriate. Further receipt of the appropriate SYN sequence sets the SYN DETECT status bit. If the SYN stripping mode is commanded, SYN characters are not transferred to the holding register. Note that the SYN characters used to establish initial synchronization are not transferred to the holding register in any case.
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