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CDCE62005 Datasheet(PDF) 40 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 76 page  CDCE62005 SCAS862 – NOVEMBER 2008........................................................................................................................................................................................... www.ti.com Table 15. CDCE62005 Universal Input Buffer Configuration Matrix (continued) PRI_IN CONFIGURATION MATRIX SETTINGS CONFIGURATION Register.Bit → 5.7 5.1 5.0 5.8 5.9 5.6 Bit Name → HYSTEN INBUFSELY INBUFSELX PRI_TERMSEL PRIINVBB ACDCSEL Hysteresis Mode Coupling Termination Vbb 1 1 0 0 0 0 ENABLED LVPECL AC Internal 1.9V 1 1 0 0 0 1 ENABLED LVPECL DC Internal 1.2V 1 1 0 1 X X ENABLED LVPECL — External — 1 1 1 0 0 0 ENABLED LVDS AC Internal 1.2V 1 1 1 0 0 1 ENABLED LVDS DC Internal 1.2V 1 1 1 1 X X ENABLED LVDS — External — 0 X X X X X OFF — — — — 1 X X X X X ENABLED — — — — LVDS Fail Safe Mode Differential data line receivers can switch on noise in the absence of an input signal. This occurs when the bus driver is turned off or the interconnect is damaged or missing. Traditionally the solution to this problem involves incorporating an external resistor network on the receiver input. This network applies a steady-state bias voltage to the input pins. The additional cost of the external components notwithstanding, the use of such a network lowers input signal magnitude and thus reduces the differential noise margin. The CDCE62005 provides internal failsafe circuitry on all LVDS inputs if enabled as shown in Table 16 for DC termination only. Table 16. LVDS Failsafe Settings Bit Name → FAILSAFE LVDS Failsafe Register.Bit → 5.11 0 Disabled for all inputs 1 Enabled for all inputs Smart Multiplexer Controls The smart multiplexer implements a configurable switching mechanism suitable for many applications in which fault tolerance is a design consideration. It includes the multiplexer itself along with three dividers. With respect to the multiplexer control, Table 17 provides an overview of the configurations supported by the CDCE62005. Table 17. CDCE62005 Smart Multiplexer Settings REGISTER 5 SETTINGS EECLKSEL AUXSEL SECSEL PRISEL SMART MULTIPLEXER MODE 5.5 5.4 5.3 5.2 1 0 0 1 Manual Mode: PRI_IN selected 1 0 1 0 Manual Mode: SEC_IN selected 1 1 0 0 Manual Mode: AUX_IN selected 1 0 1 1 Auto MOde: PRI_IN then SEC_IN 1 1 1 1 Auto Mode: PRI_IN then SEC_IN then AUX_IN 0 X 1 1 REF_SEL pin selects PRI_IN or SEC_IN 40 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s) :CDCE62005 |
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