Answers Database LOGIBLOX Multiplexer: When are Tristate Buffers / TBUFs used to implement a LogiBLOX MUX? Record #6761 Product Family: Software Product Line: FPGA Implementation Product Part: logiblox Problem Title: LOGIBLOX Multiplexer: When are Tristate Buffers / TBUFs used to implement a LogiBLOX MUX? Problem Description: Urgency: standard General Description: When LogiBLOX generates a mux, when does it use Tristate Buffers, and when does it use Gates? Solution 1: 9500/XL, Spartan/XL: LogiBLOX MUXes are always created with Gates. 4000X: TBUFs are used for muxing for 4K devices only when:    - the user explicitly selects a style of "Wired AND" when generating the MUX, OR if the following two conditions hold:     - a style of Maximum Speed is selected , AND     - the bus width is > 4bits If you wish to have the MUX implemented with gates, specify a style of "Normal Gates" when generating the module. End of Record #6761 - Last Modified: 06/14/99 15:07

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