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XRT7250 Datasheet(PDF) 147 Page - Exar Corporation |
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XRT7250 Datasheet(HTML) 147 Page - Exar Corporation |
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147 / 463 page  XRT7250 DS3/E3 FRAMER IC áç áç áç áç REV. 1.1.1 128 Fi = Frame synchronization bit with logic value i P = Parity bit Mi = Multiframe synchronization bit with logic value i AIC = Application Identification Channel NA = reserved for network application FEAC = Far End Alarm and Control DL = Data Link CP = CP (Path)-bit parity FEBE = Far End Block Error UDL = User Data Link X = Signaling bit for network control I = Payload Information (84 bit packets) Fi = Frame synchronization bit with logic value i Cij = jth stuff code bit of ith channel P = Parity bit Mi = multiframe synchronization bit with logic values i The user can choose between these two frame for- mats, by writing the appropriate data to bit 2 of the Framer Operating Mode Register (Address = 0x00), as depicted below. Table 16 lists the relationship between the value of the this bit-field and the resulting DS3 Frame Format. NOTE: This bit setting also configures the frame format for both the Transmit and Receive Section of the XRT7250. Each of the two DS3 Frame Formats, as presented in Figure 40 and Figure 41, constitute an M-frame (or a full DS3 Frame). Each M-frame consists of 7 - 680 bit F-frames (sometimes referred to as, subframes). In Figure 40 and 41, each F-frame is represented by the individual rows of payload and overhead bits. Each F-frame can be further divided into 8 blocks of 85 bits, with 84 of the 85 bits available for payload in- formation and the remaining one bit used for frame overhead. Differences Between the M13 and C-Bit Parity Frame Formats The frame formats for M13 and C-bit Parity are very similar. However, the main difference between these FIGURE 41. DS3 FRAME FORMAT FOR M13 X IF1 IC11 IF0 IC12 IF0 IC13 IF1 I I X IF1 IC21 IF0 IC22 IF0 IC23 IF1 I P IF1 IC31 IF0 IC32 IF0 IC33 IF1 I P IF1 IC41 IF0 IC42 IF0 IC43 IF1 I M0 IF1 IC51 IF0 IC52 IF0 IC53 IF1 I M1 IF1 IC61 IF0 IC62 IF0 IC63 IF1 I M0 IF1 IC71 IF0 IC72 IF0 IC73 IF1 I FRAMER OPERATING MODE REGISTER (ADDRESS = 0X00) BIT 7 BIT 6BIT 5BIT 4BIT 3 BIT2BIT 1BIT 0 Local Loopback DS3/E3* Internal LOS Enable RESET Interrupt Enable Reset Frame Format TimRefSel[1:0] R/W R/W R/W R/W R/W R/W R/W R/W x 1x 0 x xx x TABLE 16: THE RELATIONSHIP BETWEEN THE CONTENT OF BIT 2, (C-BIT PARITY*/M13) WITHIN THE FRAMER OPERATING MODE REGISTER AND THE RESULTING DS3 FRAMING FORMAT BIT 2 DS3 FRAME FORMAT 0 C-Bit Parity 1M13 |
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