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DS26401 Datasheet(PDF) 27 Page - Dallas Semiconductor |
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DS26401 Datasheet(HTML) 27 Page - Dallas Semiconductor |
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27 / 309 page  DS26401 Octal T1/E1/J1 Framer 27 7.3 IBO Multiplexer The IBO multiplexer is used with the IBO function located within each framer/formatter block (controlled by the RIBOC and TIBOC registers). When enabled, the IBO multiplexer simplifies user interface by connecting TDM bus signals internally. The IBO multiplexer eliminates the need for ganged external wiring and tri-state output drivers on the RSER and RSIG pins. The DS26401 also supports the traditional mode of IBO operation by allowing complete access to individual framers and tri-stating the RSER and RSIG pins at the appropriate times for external bus wiring. This operation mode is enabled per framer in the associated RIBOC and TIBOC registers, while leaving the IBO multiplexer disabled (IBOMS0 = 0 and IBOMS1 = 0). Figure 7-1, Figure 7-2, and Figure 7-3 show the equivalent internal circuit for each IBO mode. Table 7-1 describes the pin function changes for each mode of the IBO multiplexer. The transmit and receive IBO functions are described in Sections 8.21 (T1 XMIT), 9.20 (T1 REC), 10.17 (E1 XMIT), and 11.19 (E1 REC). |
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