Kawasaki 80C152, KS152JB, 80C51 technical specifications Jitter Receive

KS152JB Universal Communications Controller Technical Specifications

age and currents that the GSC is capable of providing are the same levels as those for normal port operation. The signal used to enable the external drivers is DEN. No similar signal is needed for the receiver.

DEN is active one bit time before transmission begins. In CSMA/CD DEN remains active for two bit times after the CRC is transmitted. In SDLC DEN remains active until the last bit of the EOF is transmitted.

3.5.8 JITTER (RECEIVE)

Data jitter is the difference between the actual transmitted waveform and the exact calculated value(s). In NRZI, data jitter would be how much the actual wave-form exceeds or falls short of one calculated bit time. A bit time equal 1/ baud rate. If using Manchester encoding, there can be two transitions during one bit time as shown in Figure below. This causes a second parameter to be considered when trying to figure out the complete data jitter amount. This other parameter is the half-bit jitter.The half-bit jitter is comprised of the difference in time that the half-bit transition actually occurs and the calculated value. Jitter is important because if the transition occurs too soon it is considered noise, and if the transition occurs too late, then either the bit is missed or a collision is assumed.

Kawasaki LSI USA, Inc. Page 61 of 120 Ver. 0.9 KS152JB2