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SpriteChannel/libs/PriorityEncoders.vhd
MaxP bbe0ff9b9e Adds priority encoders and pipeline-based modules 
Implements various priority encoder components with combinatorial logic for encoding input vectors to output codes of varying widths.

Introduces pipeline-based modules for handling calculation, ROM data fetching, and scheduling operations with AXI-like handshaking interfaces.

Facilitates modular and reusable design for priority encoding and data processing tasks.
2025-04-20 03:02:02 +00:00

346 lines
14 KiB
VHDL
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library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (2 to 1 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 1-bit output code.
entity PriorityEncoder_2 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(1 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(0 downto 0) := (others => '0')
);
end entity PriorityEncoder_2;
architecture Combinatoric of PriorityEncoder_2 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(0 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "0" when I_Select(1) = '1' else
"1" when I_Select(0) = '1' else
"-";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (4 to 2 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 2-bit output code.
entity PriorityEncoder_4 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(3 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(1 downto 0) := (others => '0')
);
end entity PriorityEncoder_4;
architecture Combinatoric of PriorityEncoder_4 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(1 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "00" when I_Select(3) = '1' else
"01" when I_Select(2) = '1' else
"10" when I_Select(1) = '1' else
"11" when I_Select(0) = '1' else
"--";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (8 to 3 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 3-bit output code.
entity PriorityEncoder_8 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(7 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(2 downto 0) := (others => '0')
);
end entity PriorityEncoder_8;
architecture Combinatoric of PriorityEncoder_8 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(2 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "000" when I_Select(7) = '1' else
"001" when I_Select(6) = '1' else
"010" when I_Select(5) = '1' else
"011" when I_Select(4) = '1' else
"100" when I_Select(3) = '1' else
"101" when I_Select(2) = '1' else
"110" when I_Select(1) = '1' else
"111" when I_Select(0) = '1' else
"---";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (16 to 4 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 4-bit output code.
entity PriorityEncoder_16 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(15 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(3 downto 0) := (others => '0')
);
end entity PriorityEncoder_16;
architecture Combinatoric of PriorityEncoder_16 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(3 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "0000" when I_Select(15) = '1' else
"0001" when I_Select(14) = '1' else
"0010" when I_Select(13) = '1' else
"0011" when I_Select(12) = '1' else
"0100" when I_Select(11) = '1' else
"0101" when I_Select(10) = '1' else
"0110" when I_Select(9) = '1' else
"0111" when I_Select(8) = '1' else
"1000" when I_Select(7) = '1' else
"1001" when I_Select(6) = '1' else
"1010" when I_Select(5) = '1' else
"1011" when I_Select(4) = '1' else
"1100" when I_Select(3) = '1' else
"1101" when I_Select(2) = '1' else
"1110" when I_Select(1) = '1' else
"1111" when I_Select(0) = '1' else
"----";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (32 to 5 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 5-bit output code.
entity PriorityEncoder_32 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(31 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(4 downto 0) := (others => '0')
);
end entity PriorityEncoder_32;
architecture Combinatoric of PriorityEncoder_32 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(4 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "00000" when I_Select(31) = '1' else
"00001" when I_Select(30) = '1' else
"00010" when I_Select(29) = '1' else
"00011" when I_Select(28) = '1' else
"00100" when I_Select(27) = '1' else
"00101" when I_Select(26) = '1' else
"00110" when I_Select(25) = '1' else
"00111" when I_Select(24) = '1' else
"01000" when I_Select(23) = '1' else
"01001" when I_Select(22) = '1' else
"01010" when I_Select(21) = '1' else
"01011" when I_Select(20) = '1' else
"01100" when I_Select(19) = '1' else
"01101" when I_Select(18) = '1' else
"01110" when I_Select(17) = '1' else
"01111" when I_Select(16) = '1' else
"10000" when I_Select(15) = '1' else
"10001" when I_Select(14) = '1' else
"10010" when I_Select(13) = '1' else
"10011" when I_Select(12) = '1' else
"10100" when I_Select(11) = '1' else
"10101" when I_Select(10) = '1' else
"10110" when I_Select(9) = '1' else
"10111" when I_Select(8) = '1' else
"11000" when I_Select(7) = '1' else
"11001" when I_Select(6) = '1' else
"11010" when I_Select(5) = '1' else
"11011" when I_Select(4) = '1' else
"11100" when I_Select(3) = '1' else
"11101" when I_Select(2) = '1' else
"11110" when I_Select(1) = '1' else
"11111" when I_Select(0) = '1' else
"-----";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
--@ Priority Encoder (64 to 6 bits)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 6-bit output code.
entity PriorityEncoder_64 is
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(63 downto 0) := (others => '0');
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(5 downto 0) := (others => '0')
);
end entity PriorityEncoder_64;
architecture Combinatoric of PriorityEncoder_64 is
--@ Internal signal to hold the encoded output.
signal C_Code : std_logic_vector(5 downto 0);
--@ Attribute to force the synthesis tool (XST, old Parser) to treat this as a combinatorial signal.
attribute PRIORITY_EXTRACT : string;
attribute PRIORITY_EXTRACT of C_Code : signal is "force";
begin
C_Code <= "000000" when I_Select(63) = '1' else
"000001" when I_Select(62) = '1' else
"000010" when I_Select(61) = '1' else
"000011" when I_Select(60) = '1' else
"000100" when I_Select(59) = '1' else
"000101" when I_Select(58) = '1' else
"000110" when I_Select(57) = '1' else
"000111" when I_Select(56) = '1' else
"001000" when I_Select(55) = '1' else
"001001" when I_Select(54) = '1' else
"001010" when I_Select(53) = '1' else
"001011" when I_Select(52) = '1' else
"001100" when I_Select(51) = '1' else
"001101" when I_Select(50) = '1' else
"001110" when I_Select(49) = '1' else
"001111" when I_Select(48) = '1' else
"010000" when I_Select(47) = '1' else
"010001" when I_Select(46) = '1' else
"010010" when I_Select(45) = '1' else
"010011" when I_Select(44) = '1' else
"010100" when I_Select(43) = '1' else
"010101" when I_Select(42) = '1' else
"010110" when I_Select(41) = '1' else
"010111" when I_Select(40) = '1' else
"011000" when I_Select(39) = '1' else
"011001" when I_Select(38) = '1' else
"011010" when I_Select(37) = '1' else
"011011" when I_Select(36) = '1' else
"011100" when I_Select(35) = '1' else
"011101" when I_Select(34) = '1' else
"011110" when I_Select(33) = '1' else
"011111" when I_Select(32) = '1' else
"100000" when I_Select(31) = '1' else
"100001" when I_Select(30) = '1' else
"100010" when I_Select(29) = '1' else
"100011" when I_Select(28) = '1' else
"100100" when I_Select(27) = '1' else
"100101" when I_Select(26) = '1' else
"100110" when I_Select(25) = '1' else
"100111" when I_Select(24) = '1' else
"101000" when I_Select(23) = '1' else
"101001" when I_Select(22) = '1' else
"101010" when I_Select(21) = '1' else
"101011" when I_Select(20) = '1' else
"101100" when I_Select(19) = '1' else
"101101" when I_Select(18) = '1' else
"101110" when I_Select(17) = '1' else
"101111" when I_Select(16) = '1' else
"110000" when I_Select(15) = '1' else
"110001" when I_Select(14) = '1' else
"110010" when I_Select(13) = '1' else
"110011" when I_Select(12) = '1' else
"110100" when I_Select(11) = '1' else
"110101" when I_Select(10) = '1' else
"110110" when I_Select(9) = '1' else
"110111" when I_Select(8) = '1' else
"111000" when I_Select(7) = '1' else
"111001" when I_Select(6) = '1' else
"111010" when I_Select(5) = '1' else
"111011" when I_Select(4) = '1' else
"111100" when I_Select(3) = '1' else
"111101" when I_Select(2) = '1' else
"111110" when I_Select(1) = '1' else
"111111" when I_Select(0) = '1' else
"------";
O_Code <= C_Code;
end architecture;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use ieee.math_real.all;
--@ Priority Encoder (Generic)
--@ This is a combinatorial priority encoder that encodes the highest priority
--@ bit in the input vector to a 6-bit output code.
entity PriorityEncoder_G is
generic (
--@ Code width with minimum 2 bits and maximum 6 bits.
G_CodeWidth : integer := 6
);
port (
--@ Input vector to be encoded.
--@ The least significant bit has the highest priority.
I_Select : in std_logic_vector(2 ** G_CodeWidth - 1 downto 0);
--@ Output code.
--@ The output code is the index of the highest priority bit in the input vector.
O_Code : out std_logic_vector(G_CodeWidth - 1 downto 0)
);
end entity PriorityEncoder_G;
architecture Combinatoric of PriorityEncoder_G is
signal C_Select : std_logic_vector(63 downto 0) := (others => '-');
signal C_Code : std_logic_vector(5 downto 0) := (others => '-');
begin
entity_inst : entity work.PriorityEncoder_64
port map(
I_Select => C_Select,
O_Code => C_Code
);
C_Select(G_CodeWidth * 2 - 1 downto 0) <= I_Select;
O_Code <= C_Code(G_CodeWidth - 1 downto 0);
end architecture;
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