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CD22103A Folha de dados(PDF) 4 Page - Intersil Corporation |
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CD22103A Folha de dados(HTML) 4 Page - Intersil Corporation |
4 / 6 page 4 A violation pulse ( ±V) is considered a reception error and does not cause replacement of the last string of 4 bits to zeros, if: The received 4 data bits previous to reception of the violation pulse have not been the sequence BX00 (where X = don't care). The error signal (ERR) remains low. NOTES: 1. The data sequences B000V and BB00V are valid HDB3 codings of the NRZ binary sequence 10000. 2. The error signal (ERR) count, is the accurate number of all single bit errors. AML SIGNALS HDB3/AML = LOW A coding error (ERR) is signaled when a violation pulse (+V) is received. IN EITHER THE HDB3 OR AMI MODE When high levels appear simultaneously on both HDB3 inputs (+ HDB3 IN, -HDB3 IN) a logical one is assumed in the HDB3/AMl input stream and the error signal (ERR) goes high for the duration of the violation. Alarm Inhibit Signal The alarm output (AIS) is set high if, in two successive periods of the external Reset Alarm Signal (RAlS), less than three zeros are received. The alarm output (AlS) is reset low when three or more zeros are received during two Reset Alarm Signal periods. Transcoder Operation Transmitter Coder (See Figure 1) The HDB3/AMI transmitter coder operates on 4-bit serial strings of NRZ binary data and a synchronous transmitter clock (CTX). NRZ binary data is serially clocked into the transmitter on the negative transition of the (CTX) clock. HDB3/AMI coding is performed on the 4-bit string, and HDB3/AMI binary output data is clocked out to the (+HDB3 OUT, -HDB3 OUT) outputs on the positive transition of the transmitter clock (CTX) 3-1/2 clock pulses after the data appeared at the (NRZ-IN) input. Receiver Decoder (See Figure 2) The HDB3/AMI receiver decoder operates on 4-bit serial strings of binary coded HDB3/AMI signals, and a synchronous receiver clock (CRX), HDB3/AMI binary data is serially clocked into the receiver on the positive transition of the (CRX) clock. HDB3/AMI decoding is performed on the 4-bit string, and NRZ binary output data is clocked out to the (NRZ-OUT) output on the positive transition of the receiver clock (CRX) 4 clock pulses after the data appeared at the (+HDB3 IN, -HDB3 IN) inputs. Timing Waveforms FIGURE 1. TRANSMITTER CODER OPERATION TIMING WAVEFORMS - NRZ TO HDB3/AMI CODING HANDLING DELAY NRZ - IN +HDB3 OUT HDB3 CODED -HDB3 OUT EXTERNAL GENERATED TERNERY HDB3 +HDB3 OUT AMI CODED -HDB3 OUT EXTERNAL GENERATED AMI CTX CD22103A |
Nº de peça semelhante - CD22103A_02 |
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Descrição semelhante - CD22103A_02 |
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