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XRT7250 Datasheet(PDF) 305 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 305 Page - Exar Corporation |
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305 / 463 page  XRT7250 áç áç áç áç DS3/E3 FRAMER IC REV. 1.1.1 286 5.3.1.2.1 AMI Decoding AMI or Alternate Mark Inversion, means that consec- utive "one's" pulses (or marks) will be of opposite po- larity with respect to each other. This line code in- volves the use of three different amplitude levels: +1, 0, and -1. The +1 and -1 amplitude signals are used to represent one's (or mark) pulses and the "0" ampli- tude pulses (or the absence of a pulse) are used to represent zeros (or space) pulses. The general rule for AMI is: if a given mark pulse is of positive polarity, then the very next mark pulse will be of negative po- larity and vice versa. This alternating-polarity rela- tionship exists between two consecutive mark pulses, independent of the number of zeros that exist be- tween these two pulses. Figure 131 presents an illus- tration of the AMI Line Code as would appear at the RxPOS and RxNEG pins of the Framer, as well as the 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. FIGURE 130. ILLUSTRATION ON HOW THE RECEIVE E3 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 131. 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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