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XRT7250 Datasheet(PDF) 204 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 204 Page - Exar Corporation |
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204 / 463 page  áç áç áç áç DS3/E3 FRAMER IC XRT7250 REV. 1.1.1 185 4.3.1.2.1 AMI Decoding AMI or Alternate Mark Inversion, means that consec- utive one's pulses (or marks) will be of opposite polar- ity with respect to each other. This line code involves the use of three different amplitude levels: +1, 0, and - 1. The +1 and -1 amplitude signals are used to repre- sent one's (or mark) pulses and the "0" amplitude pulses (or the absence of a pulse) are used to repre- sent zeros (or space) pulses. The general rule for the AMI line code is: if a given mark pulse is of positive polarity, then the very next mark pulse will be of nega- tive polarity and vice versa. This alternating-polarity relationship exists between two consecutive mark pulses, independent of the number of zeros that exist between these two pulses. Figure 76 presents an il- lustration of the AMI Line Code as would appear at the RxPOS and RxNEG input pins of the Framer, as well as the corresponding output signal on the line. NOTE: One of the reasons that the AMI Line Code has been chosen for driving copper medium, isolated via trans- formers, is that this line code has no dc component, thereby eliminating dc distortion in the line. 4.3.1.2.2 B3ZS Decoding FIGURE 75. ILLUSTRATION ON HOW THE RECEIVE DS3 FRAMER (WITHIN THE XRT7250 FRAMER IC) BEING INTER- FACE TO THE XRT7300 LINE INTERFACE UNIT, WHILE THE FRAMER IS OPERATING IN BIPOLAR MODE 5V U1 XRT7250 TxPOS 65 TxNEG 64 TxLineClk 63 DMO 79 ExtLOS 78 RLOL 77 LLOOP 69 RLOOP 70 TAOS 68 TxLEV 67 ENCODIS 66 REQB 71 RxPOS 76 RxNEG 75 RxLineClk 74 MOTO 27 RESETB 28 A0 15 A1 16 A2 17 A3 18 A4 19 A5 20 A6 21 A7 22 A8 23 D0 32 D1 33 D2 34 D3 35 D4 36 D5 37 D6 38 D7 39 Rdy_Dtck 6 WRB_RW 7 RDB_DS 10 CSB 8 ALE_AS 9 INTB 13 TxSER 46 TxInClk 43 TxFrame 61 RxSer 86 RxClk 88 RxFrame 90 RxLOS 95 RxOOF 94 RxRED 93 RxAIS 87 NIBBLEINTF 25 U2 XRT7300 TPDATA 37 TNDATA 38 TCLK 36 RCLK1 31 RNEG 32 RPOS 33 TTIP 41 TRING 40 MTIP 44 MRING 43 RRING 9 RTIP 8 DMO 4 RLOS 24 RLOL 23 LLB 14 RLB 15 TAOS 2 TxLEV 1 ENCODIS 21 REQDIS 12 T1 1:1 1 5 4 8 T2 1:1 1 5 4 8 R1 36 1 2 R2 36 1 2 R6 37.5 R3 270 1 2 R4 270 1 2 R5 37.5 C1 0.01uF 1 2 TxSER TxInClk NIBBLEINTF RESETB RTIP RRING CSB RW DS AS TxFrame RxSer RxClk RxFrame RxLOS RxOOF RxRED RxAIS A[8:0] TRING TTIP INTB D[7:0] INTB FIGURE 76. ILLUSTRATION OF AMI LINE CODE Data 1 0 1 1 0 0 0 1 0 1 1 1 1 0 1 1 0 1 1 0 0 1 1 0 0 0 0 1 RxPOS RxNEG Line Signal |
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