Czy możesz mi powiedzieć, czy istnieje lepszy sposób na napisanie kodera priorytetowego w VHDL, niż użycie instrukcji if-else? Mam na myśli, że mam ten kod i działa, ale czy można go napisać krótszy? Przełącznik to std_logic_vector.Krótka droga do pisania enkodera priorytetowego VHDL
Dzięki za pomoc!
shifting : PROCESS(CLK_IN, new_length_ready, switch)
VARIABLE highest_switch : INTEGER RANGE 0 TO 15 := 15;
BEGIN
-- priority encoder, changes the length of the snake track
-- (i.e., number of leds for the snake to move)
IF switch(15) = '1' THEN
highest_switch := 15;
ELSIF switch(14) = '1' THEN
highest_switch := 14;
ELSIF switch(13) = '1' THEN
highest_switch := 13;
ELSIF switch(12) = '1' THEN
highest_switch := 12;
ELSIF switch(11) = '1' THEN
highest_switch := 11;
ELSIF switch(10) = '1' THEN
highest_switch := 10;
ELSIF switch(9) = '1' THEN
highest_switch := 9;
ELSIF switch(8) = '1' THEN
highest_switch := 8;
ELSIF switch(7) = '1' THEN
highest_switch := 7;
ELSIF switch(6) = '1' THEN
highest_switch := 6;
ELSIF switch(5) = '1' THEN
highest_switch := 5;
ELSIF switch(4) = '1' THEN
highest_switch := 4;
ELSIF switch(3) = '1' THEN
highest_switch := 3;
ELSIF switch(2) = '1' THEN
highest_switch := 2;
ELSIF switch(1) = '1' THEN
highest_switch := 1;
ELSIF switch(0) = '1' THEN
highest_switch := 0;
ELSE
highest_switch := 15;
END IF