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DP83261AVF Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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DP83261AVF Datasheet(HTML) 8 Page - National Semiconductor (TI) |
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8 / 132 page  40 FDDI MAC Facilities 41 SYMBOL SET The Ring Engine recognizes and generates a set of sym- bols These symbols are used to convey Line States (such as the Idle Line State) Control Sequences (such as the Starting and Ending Delimiters) and Data Additional information regarding the symbol set can be found in the FDDI PHY Standard The Ring Engine expects that the Starting Delimiter will al- ways be conveyed on an even symbol pair boundary Fol- lowing the starting delimiter data symbols should always come in matched pairs Similarly the Ending Delimiter should always come in one or more matched symbol pairs The symbol pairs conveyed at the PHY Interface are shown in Table 4-1 42 PROTOCOL DATA UNITS The Ring Engine recognizes and generates two types of Protocol Data Units (PDUs) Tokens and Frames The Token is used to control access to the ring Only the station that has captured the token has the right to transmit new information The format of a token is shown in Figure 4-1 SFS EFS PA SD FC ED FIGURE 4-1 Token Format Frames are used to pass information between stations The format of a frame is shown in Figure 4-2 with the field defini- tions in Table 4-2 SFS Protected by PCS EFS PA SD FC DA SA INFO FCS ED FS FIGURE 4-2 Frame Format TABLE 4-1 Symbol Pair Set Type Symbols Starting Delimiter JK Ending Delimiter TT or TR or TS or nT Frame Status RR or RS or SR or SS Idle ll or nl Data Pair nn Note n represents any data symbol (0–F) Symbol pairs others than the defined symbols are treated as code violations Section 72 has additional information on the symbol pairs generated and interpreted by the Ring Engine TABLE 4-2 PDU Fields Name Description Size SFS Start of Frame Sequence PA Preamble 8 or More Idle Symbol Pairs SD Starting Delimiter JK Symbol Pair FC Frame Control Field 1 Data Symbol Pair DA Destination Address 2 or 6 Symbol Pairs SA Source Address 2 or 6 Symbol Pairs INFO Information Field FCS Frame Check Sequence 4 Symbol Pairs EFS End of Frame Sequence ED Ending Delimiter At Least 1T Symbol for Frames At Least 2T Symbols for Tokens FS Frame Status 3 or More R or S Symbols 8 |
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