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XRT7250 Datasheet(PDF) 193 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 193 Page - Exar Corporation |
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193 / 463 page  XRT7250 DS3/E3 FRAMER IC áç áç áç áç REV. 1.1.1 174 The Transmit Section of the XRT7250 contains a block which is known as the Transmit DS3 LIU Inter- face block. The purpose of the Transmit DS3 LIU In- terface block is to take the outbound DS3 data stream, from the Transmit DS3 Framer block, and to do the following: 1. Encode this data into one of the following line codes a. Unipolar (e.g., Single-Rail) b. AMI (Alternate Mark Inversion) c. B3ZS (Bipolar 3 Zero Substitution) 2. And to transmit this data to the LIU IC. Figure 66 presents a simple illustration of the Trans- mit DS3 LIU Interface block. FIGURE 65. APPROACH TO INTERFACING THE XRT7250 FRAMER IC TO THE XRT7300 DS3/E3/STS-1 TRANSMIT- TER LIU 5V U1 X R T7250 TxP OS 65 TxN E G 64 TxLineC lk 63 DMO 79 E xtLOS 78 RLOL 77 LLOOP 69 RLOOP 70 TA OS 68 TxLE V 67 E N CODIS 66 RE QB 71 RxP OS 76 RxN E G 75 RxLineClk 74 MOTO 27 R E SETB 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 WR B _R W 7 RD B _DS 10 CS B 8 ALE _AS 9 IN TB 13 TxS E R 46 TxInC lk 43 TxFrame 61 RxS er 86 RxC lk 88 RxFrame 90 RxLOS 95 RxOOF 94 RxR E D 93 RxA IS 87 NIB B LE IN TF 25 U2 X R T7300 TP D A TA 37 TN D A TA 38 TC LK 36 RC LK 1 31 RN E G 32 RP OS 33 TTIP 41 TR IN G 40 MTIP 44 MR IN G 43 RR IN G 9 RTIP 8 DMO 4 RLOS 24 RLOL 23 LLB 14 RLB 15 TA OS 2 TxLE V 1 E N CODIS 21 RE QD IS 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 TxS E R TxInC lk NIB B LE IN TF R E SETB RTIP RR IN G CS B RW DS AS TxFrame RxS er RxC lk RxFrame RxLOS RxOOF RxR E D RxA IS A[8:0] TR IN G TTIP IN TB D[7:0] IN TB |
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