/*
WARNING: Do NOT edit the input and output ports in this file in a text
editor if you plan to continue editing the block that represents it in
the Block Editor! File corruption is VERY likely to occur.
*/
/*
Copyright (C) 1991-2007 Altera Corporation
Your use of Altera Corporation's design tools, logic functions 
and other software and tools, and its AMPP partner logic 
functions, and any output files from any of the foregoing 
(including device programming or simulation files), and any 
associated documentation or information are expressly subject 
to the terms and conditions of the Altera Program License 
Subscription Agreement, Altera MegaCore Function License 
Agreement, or other applicable license agreement, including, 
without limitation, that your use is for the sole purpose of 
programming logic devices manufactured by Altera and sold by 
Altera or its authorized distributors.  Please refer to the 
applicable agreement for further details.
*/
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	(text "Y1[1]" (rect 440 120 467 132)(font "Arial" ))
	(pt 464 136)
	(pt 432 136)
)
(connector
	(text "Y0[1]" (rect 440 160 467 172)(font "Arial" ))
	(pt 464 176)
	(pt 432 176)
)
(connector
	(text "Y3[0]" (rect 440 240 467 252)(font "Arial" ))
	(pt 464 256)
	(pt 432 256)
)
(connector
	(text "Y2[0]" (rect 440 280 467 292)(font "Arial" ))
	(pt 464 296)
	(pt 432 296)
)
(connector
	(text "Y1[0]" (rect 440 320 467 332)(font "Arial" ))
	(pt 464 336)
	(pt 432 336)
)
(connector
	(text "Y0[0]" (rect 440 360 467 372)(font "Arial" ))
	(pt 464 376)
	(pt 432 376)
)
(connector
	(text "R[3]" (rect 520 240 541 252)(font "Arial" ))
	(pt 512 256)
	(pt 552 256)
)
(connector
	(text "R[2]" (rect 520 280 541 292)(font "Arial" ))
	(pt 512 296)
	(pt 552 296)
)
(connector
	(text "R[1]" (rect 520 320 541 332)(font "Arial" ))
	(pt 512 336)
	(pt 552 336)
)
(connector
	(text "R[0]" (rect 520 360 541 372)(font "Arial" ))
	(pt 512 376)
	(pt 552 376)
)
(junction (pt 160 72))
(junction (pt 160 176))
(junction (pt 160 280))
(junction (pt 160 384))
(junction (pt 408 88))
(junction (pt 408 192))
(junction (pt 408 296))
(junction (pt 408 400))
(junction (pt 648 -40))
(junction (pt 648 40))
(text "1. The 16 input bits are divided into groups of 4, starting with the highest priority bits." (rect -16 16 464 30)(font "Arial" (font_size 8)))
(text "4. Note that the labels of the Y signals match the names on the output bus pins." (rect 768 -8 1217 6)(font "Arial" (font_size 8)))
(text "It is legal to omit the connecting wire in this case, and it is sometimes clearer." (rect 768 8 1203 22)(font "Arial" (font_size 8)))
(text "5. The final step (in a sense... the hardware components are working in parallel, continually updating" (rect 592 232 1163 246)(font "Arial" (font_size 8)))
(text "their outputs in response to input changes) is to select the 2 LSBs of the highest priority signal." (rect 592 248 1131 262)(font "Arial" (font_size 8)))
(text "Y[3..2] tells us which group contains the 2 LSBs and so we use it as the select input to MUXes" (rect 592 264 1131 278)(font "Arial" (font_size 8)))
(text "(1 for each bit).  The data bits to the MUXes are ID bits coming out of the left priority encoders." (rect 592 280 1126 294)(font "Arial" (font_size 8)))
(text "The top MUX handles bit 1 (the 2nd to LSB); it needs bit [1] from each encoder at left.  The WIRE" (rect 592 296 1134 310)(font "Arial" (font_size 8)))
(text "component is used to allow the renaming of bits, taking 1 bit from each of 4 busses and putting them" (rect 592 312 1160 326)(font "Arial" (font_size 8)))
(text "onto a single bus named Q.  The bottom MUX does the same thing for bit 0 of the overall ID number, using" (rect 592 328 1186 342)(font "Arial" (font_size 8)))
(text "a bus called R to hold the bits [0]." (rect 592 344 779 358)(font "Arial" (font_size 8)))
(text "2. The Z signals from the first 4 priority encoders are passed through another priority encoder so we know which group of 4 contains the highest priority active signal." (rect 32 -88 981 -74)(font "Arial" (font_size 8)))
(text "16:4 Priority Encoder from 4:2 Priority Encoders" (rect -8 -56 468 -34)(font "Arial" (font_size 14)))
(text "Dr. Durant - 5-February-2008" (rect -8 -32 278 -10)(font "Arial" (font_size 14)))
(text "3. The 2 bits from the 2nd layer encoder identify the group (00 through 11) that contains the highest priority signal." (rect 592 -72 1239 -58)(font "Arial" (font_size 8)))