网站背景特效,网站建设与管理维护参考文献,系统网站建设ppt,天元建设集团有限公司商业承兑汇票拒付最新消息DSP块基元利用模式检测电路来计算收敛舍入#xff08;要么为偶数#xff0c;要么为奇数#xff09;。以下是收敛舍入推理的示例#xff0c;它在块满时进行推理并且还推断出2输入and门#xff08;1 LUT#xff09;以实现LSB校正。 Rounding to Even (Verilog) Filename: …DSP块基元利用模式检测电路来计算收敛舍入要么为偶数要么为奇数。以下是收敛舍入推理的示例它在块满时进行推理并且还推断出2输入and门1 LUT以实现LSB校正。 Rounding to Even (Verilog) Filename: convergentRoundingEven.v // Convergent rounding(Even) Example which makes use of pattern detect // File: convergentRoundingEven.v module convergentRoundingEven ( input clk, input [23:0] a, input [15:0] b, output reg signed [23:0] zlast ); reg signed [23:0] areg; reg signed [15:0] breg; reg signed [39:0] z1; reg pattern_detect; wire [15:0] pattern 16b0000000000000000; wire [39:0] c 40b0000000000000000000000000111111111111111; // 15 ones wire signed [39:0] multadd; wire signed [15:0] zero; reg signed [39:0] multadd_reg; // Convergent Rounding: LSB Correction Technique // --------------------------------------------- // For static convergent rounding, the pattern detector can be used // to detect the midpoint case. For example, in an 8-bit round, if // the decimal place is set at 4, the C input should be set to // 0000.0111. Round to even rounding should use CARRYIN 1 and // check for PATTERN XXXX.0000 and replace the units place with 0 // if the pattern is matched. See UG193 for more details. assign multadd z1 c 1b1; always (posedge clk) begin areg a; breg b; z1 areg * breg; pattern_detect multadd[15:0] pattern ? 1b1 : 1b0; multadd_reg multadd; end // Unit bit replaced with 0 if pattern is detected always (posedge clk) zlast pattern_detect ? {multadd_reg[39:17],1b0} : multadd_reg[39:16]; endmodule // convergentRoundingEven Rounding to Even (VHDL) Filename: convergentRoundingEven.vhd -- Convergent rounding(Even) Example which makes use of pattern detect -- File: convergentRoundingEven.vhd library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; entity convergentRoundingEven is port (clk : in std_logic; a : in std_logic_vector (23 downto 0); b : in std_logic_vector (15 downto 0); zlast : out std_logic_vector (23 downto 0)); end convergentRoundingEven; architecture beh of convergentRoundingEven is signal ar : signed(arange); signal br : signed(brange); signal z1 : signed(alength blength - 1 downto 0); signal multaddr : signed(alength blength - 1 downto 0); signal multadd : signed(alength blength - 1 downto 0); signal pattern_detect : boolean; constant pattern : signed(15 downto 0) : (others 0); constant c : signed : 0000000000000000000000000111111111111111; -- Convergent Rounding: LSB Correction Technique -- --------------------------------------------- -- For static convergent rounding, the pattern detector can be used -- to detect the midpoint case. For example, in an 8-bit round, if -- the decimal place is set at 4, the C input should be set to -- 0000.0111. Round to even rounding should use CARRYIN 1 and -- check for PATTERN XXXX.0000 and replace the units place with 0 -- if the pattern is matched. See UG193 for more details. begin multadd z1 c 1; process(clk) begin if rising_edge(clk) then ar signed(a); br signed(b); z1 ar * br; multaddr multadd; if multadd(15 downto 0) pattern then pattern_detect true; else pattern_detect false; end if; end if; end process; -- Unit bit replaced with 0 if pattern is detected process(clk) begin if rising_edge(clk) then if pattern_detect true then zlast std_logic_vector(multaddr(39 downto 17)) 0; else zlast std_logic_vector(multaddr(39 downto 16)); end if; end if; end process; end beh; Rounding to Odd (Verilog) Filename: convergentRoundingOdd.v // Convergent rounding(Odd) Example which makes use of pattern detect // File: convergentRoundingOdd.v module convergentRoundingOdd ( input clk, input [23:0] a, input [15:0] b, output reg signed [23:0] zlast ); reg signed [23:0] areg; reg signed [15:0] breg; reg signed [39:0] z1; reg pattern_detect; wire [15:0] pattern 16b1111111111111111; wire [39:0] c 40b0000000000000000000000000111111111111111; // 15 ones wire signed [39:0] multadd; wire signed [15:0] zero; reg signed [39:0] multadd_reg; // Convergent Rounding: LSB Correction Technique // --------------------------------------------- // For static convergent rounding, the pattern detector can be // used to detect the midpoint case. For example, in an 8-bit // round, if the decimal place is set at 4, the C input should // be set to 0000.0111. Round to odd rounding should use // CARRYIN 0 and check for PATTERN XXXX.1111 and then // replace the units place bit with 1 if the pattern is // matched. See UG193 for details assign multadd z1 c; always (posedge clk) begin areg a; breg b; z1 areg * breg; pattern_detect multadd[15:0] pattern ? 1b1 : 1b0; multadd_reg multadd; end always (posedge clk) zlast pattern_detect ? {multadd_reg[39:17],1b1} : multadd_reg[39:16]; endmodule // convergentRoundingOdd Rounding to Odd (VHDL) Filename: convergentRoundingOdd.vhd -- Convergent rounding(Odd) Example which makes use of pattern detect -- File: convergentRoundingOdd.vhd library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; entity convergentRoundingOdd is port (clk : in std_logic; a : in std_logic_vector (23 downto 0); b : in std_logic_vector (15 downto 0); zlast : out std_logic_vector (23 downto 0)); end convergentRoundingOdd; architecture beh of convergentRoundingOdd is signal ar : signed(arange); signal br : signed(brange); signal z1 : signed(alength blength - 1 downto 0); signal multadd, multaddr : signed(alength blength - 1 downto 0); signal pattern_detect : boolean; constant pattern : signed(15 downto 0) : (others 1); constant c : signed : 0000000000000000000000000111111111111111; -- Convergent Rounding: LSB Correction Technique -- --------------------------------------------- -- For static convergent rounding, the pattern detector can be -- used to detect the midpoint case. For example, in an 8-bit -- round, if the decimal place is set at 4, the C input should -- be set to 0000.0111. Round to odd rounding should use -- CARRYIN 0 and check for PATTERN XXXX.1111 and then -- replace the units place bit with 1 if the pattern is -- matched. See UG193 for details begin multadd z1 c; process(clk) begin if rising_edge(clk) then ar signed(a); br signed(b); z1 ar * br; multaddr multadd; if multadd(15 downto 0) pattern then pattern_detect true; else pattern_detect false; end if; end if; end process; process(clk) begin if rising_edge(clk) then if pattern_detect true then zlast std_logic_vector(multaddr(39 downto 17)) 1; else zlast std_logic_vector(multaddr(39 downto 16)); end if; end if; end process; end beh;
