资源说明： 7-Segment Decoder (Behavioural) The figure below shows a special 7-segment decoder module that has the two-bit input c1c0. This decoder produces seven outputs that are used to display a character on a 7-segment display. The table on the right lists the characters that should be displayed for each value of c1c0. To keep the design simple, only three characters are included in the table (plus the ‘blank’ character that is selected for codes 11). The seven segments in the display are identified by the indices 0 to 6 shown in the figure. Each segment is illuminated by driving it to the logic value 0.

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