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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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XRT7250 датащи(PDF) 142 Page - Exar Corporation |
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XRT7250 датащи(HTML) 142 Page - Exar Corporation |
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142 / 463 page  áç áç áç áç DS3/E3 FRAMER IC XRT7250 REV. 1.1.1 123 The Line Interface and Scan Section of the XRT7250 DS3/E3 Framer IC consists of 5 output pins, 3 input pins, a Read/Write register, and a Read-Only register. The purpose of the Line Interface Drive and Scan section is to permit the user to monitor and exercise control over many aspects of the XRT7300 DS3/E3/ STS-1 LIU IC without having to develop the neces- sary off-chip glue-logic. Figure 39 presents a simple circuit schematic that de- picts how the XRT7250 DS3/E3 Framer IC could be interfaced to the XRT7300 DS3/E3/STS-1 LIU IC. 3.1 BIT-FIELDS WITHIN THE LINE INTERFACE DRIVE REGISTER As mentioned above, the Line Interface Drive and Scan section consists of five output pins and three in- put pins. The logic state of the output pins are con- trolled by the contents within the Line Interface Drive register, as depicted below. The role of each of these bit-fields are their corre- sponding output pins are depicted below. FIGURE 39. SCHEMATIC DEPICTING HOW TO INTERFACE THE XRT7250 DS3/E3 FRAMER IC TO THE XRT7300 DS3/ E3/STS-1 LIU IC 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 LINE INTERFACE DRIVE REGISTER (ADDRESS = 0X80) BIT 7BIT 6BIT 5BIT 4BIT 3BIT 2BIT 1BIT 0 Not Used REQB TAOS ENCODIS TXLEV RLOOP LLOOP R/O R/O R/W R/W R/W R/W R/W R/W 0 0001 000 |
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