本文主要是介绍DSP48E1 (primitive)原语例化实例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
DSP48E1 (primitive)原语例化实例
之前倒腾dsp48e1的时候发现网上虽然有一些文章，但是大部分都是无用的文章，
正如某位同仁说的，高手都忙于泡妞，哪有精力来写文章，
把之前倒腾的代码贴出来供大家参考。
先把OPMODE和ALUMODE贴上，来自网上的文章
OPMODE用来决定下面这个图X，Y，Z这些mux的选择，一时半会看不懂，稍微花点时间是可以看懂的
上图有两个X，圆圈里面的那个X是乘法，输出就是下面表格里的M，右边的这个X才是下面表格里的MUX X
| Z OPMODE[6:4] | Y OPMODE[3:2] | X OPMODE[1:0] | X Multiplexer Output | Notes |
| xxx | xx | 00 | 0 | Default |
| xxx | 01 | 01 | M | Must select with OPMODE[3:2] = 01 |
| xxx | xx | 10 | P | Must select with PREG = 1 |
| xxx | xx | 11 | A:B | 48 bits wide |
这个表格表示X的选择
可以选择M，P或者A:B,
01选M，10选P，11选A:B
| Z OPMODE[6:4] | Y OPMODE[3:2] | X OPMODE[1:0] | Y Multiplexer Output | Notes |
| xxx | 00 | xx | 0 | Default |
| xxx | 01 | 01 | M | Must select with OPMODE[1:0] = 01 |
| xxx | 10 | xx | 48'FFFFFFFFFFFF | Used mainly for logic unit bitwise operations on the X and Z multiplexers |
| xxx | 11 | xx | C | |
这个表格表示Y的选择，
| Z OPMODE[6:4] | Y OPMODE[3:2] | X OPMODE[1:0] | Z Multiplexer Output | Notes |
| 000 | xx | xx | 0 | Default |
| 001 | xx | xx | PCIN | |
| 010 | xx | xx | P | Must select with PREG = 1 |
| 011 | xx | xx | C | |
| 100 | 10 | 00 | P | Use for MACC extend only. Must select with PREG = 1 |
| 101 | xx | xx | 17-bit Shift (PCIN) | |
| 110 | xx | xx | 17-bit Shift (P) | Must select with PREG = 1 |
| 111 | xx | xx | xx | Illegal selection |
这个表格表示Z的选择
ALUMODE
4位ALUMODE控制第二阶段加/减/逻辑单元的行为。
ALUMODE = 0000 选择表单Z + (X + Y)的添加操作。
ALUMODE = 0011 选择Z - (X + Y )形式的减运算。
ALUMODE = 0001 可以实现- z + (X + Y) - 1 = not (Z) + X + Y。
ALUMODE = 0010 可以实现 - (Z + X + Y) - 1 = not (Z + X + Y)。
2的补数的负数是通过按位反转和加1得到的，例如-k = not (k) + 1。
INMODE暂时还没试验过
| INMODE[3] | INMODE[2] | INMODE[1] | INMODE[0] | USE_DPORT | Multiplier A Port |
| 0 | 0 | 0 | 0 | FALSE | A2 |
| 0 | 0 | 0 | 1 | FALSE | A1 |
| 0 | 0 | 1 | 0 | FALSE | Zero |
| 0 | 0 | 1 | 1 | FALSE | Zero |
| 0 | 0 | 0 | 0 | TRUE | A2 |
| 0 | 0 | 0 | 1 | TRUE | A1 |
| 0 | 0 | 1 | 0 | TRUE | Zero |
| 0 | 0 | 1 | 1 | TRUE | Zero |
| 0 | 1 | 0 | 0 | TRUE | D + A2(1) |
| 0 | 1 | 0 | 1 | TRUE | D + A1(1) |
| 0 | 1 | 1 | 0 | TRUE | D |
| 0 | 1 | 1 | 1 | TRUE | D |
| 1 | 0 | 0 | 0 | TRUE | -A2 |
| 1 | 0 | 0 | 1 | TRUE | -A1 |
| 1 | 0 | 1 | 0 | TRUE | Zero |
| 1 | 0 | 1 | 1 | TRUE | Zero |
| 1 | 1 | 0 | 0 | TRUE | D – A2(1) |
| 1 | 1 | 0 | 1 | TRUE | D – A1(1) |
| 1 | 1 | 1 | 0 | TRUE | D |
| 1 | 1 | 1 | 1 | TRUE | D |
| INMODE[4] | Multiplier B Port |
| 0 | B2 |
| 1 | B1 |
之前尝试例化dsp48e1的时候，google百度都解决不了问题，直接拿dsp48e1的代码来仿，这样还更快一点，
为了节省大家的时间，我把DSP48E1的仿真工程放到github里，大家可以下载下来调试，
https://github.com/tishi43/dsp48e1
加了如下中间变量的打印，如果结果不如预期，可以观察这些变量，继续跟踪哪步结果异常，
a_o_mux根据A_INPUT=DIRECT还是CASCADE 选择a_in,还是acin_in
qd_o_mux 根据DREG，选择d_in还是延迟一周期的d_in
ad_addsub, 顾名思义，就是选择A+D,还是A-D
直接上代码更直观一点
assign ad_addsub = qinmode_o_mux[3]?(-a_preaddsub + (qinmode_o_mux[2]?qd_o_mux:25'b0)):(a_preaddsub + (qinmode_o_mux[2]?qd_o_mux:25'b0));
qad_o_mux 根据ADREG=0还是1，选择ad_addsub还是延迟一周期的ad_addsub
mult_o就是上面图中(A+D)*B的结果，即M
qopmode_o_mux，根据OPMODEREG，选择opmode_in还是延迟1周期的opmode_in
qx_o_mux，上图中X的选择，选择M，还是A:B,还是P
alu_o差不多最终的结果了，直接看代码更容易理解
qp_o_mux，根据PREG选择alu_o还是alu_o延迟1周期
qc_o_mux，根据CREG选择c_in还是c_in延迟1周期
qz_o_mux,第三个表格中Z的选择
下面是之前我调试时的打印，把.USE_DPORT误设为TRUE时，结果为0，可以看到mult_o这一步为0了，再跟着代码拉几根信号到波形窗口，就发现问题了,
run 1us
# 0 a_o_mux[24:0] x
# 0 ADREG1 qad_o_mux 0
# 0 ALU qx_o_mux x qx_o_mux x qz_o_mux 0
# 0 qopmode_o_mux[1:0] 1 qx_o_mux x
# 0 ALU qx_o_mux x qx_o_mux 0 qz_o_mux 0
# 200000 a_o_mux[24:0] 100
# 200000 ad_addsub[24:0] 100 qinmode_o_mux[3] 0 a_preaddsub[24:0] 100 qinmode_o_mux[2] 0 qd_o_mux[24:0] 0
# 200000 a_preaddsub[24:0] 100 qinmode_o_mux[1] 0 qinmode_o_mux[0] 0 qa_o_reg1[24:0] 0 qa_o_mux[24:0] 100
# 200000 qopmode_o_mux[1:0] 1 qx_o_mux x
# 200000 mult_o 0
# 200000 qopmode_o_mux[1:0] 1 qx_o_mux x
# 200000 ALU qx_o_mux 0 qx_o_mux 0 qz_o_mux 0
# 200000 alu_o 0
# 200001 qopmode_o_mux[1:0] 1 qx_o_mux 0
# p 0
不求弄清每种组合会是什么情况，只求最常用的一些用法，如下
1 assgin o=in1*in2 立即出结果
AREG,BREG,MREG,PREG设0
CREG,DREG,ADREG实际没有用到，这些设为1其实也无意义
CLK脚可以填0，也可以填实际时钟
ALUMODE=0
OPMODE=7'b0000101
`timescale 1ns / 10ps // timescale time_unit/time_presicionmodule test(input wire clk,input wire rst,input wire signed [24:0] in1,input wire signed [17:0] in2,output wire signed [47:0] o,output wire signed [29:0] acout,output wire signed [17:0] bcout,output wire [3:0] carryout,output wire [3:0] carrycasout,output wire signed [47:0] pcout);DSP48E1 #(.A_INPUT("DIRECT"),.B_INPUT("DIRECT"),.USE_DPORT("FALSE"),.USE_MULT("MULTIPLY"), .USE_SIMD("ONE48"), .AUTORESET_PATDET("NO_RESET"), // "NO_RESET", "RESET_MATCH", "RESET_NOT_MATCH".MASK(48'h3fffffffffff), // 48-bit mask value for pattern detect (1=ignore).PATTERN(48'h000000000000), // 48-bit pattern match for pattern detect.SEL_MASK("MASK"), // "C", "MASK", "ROUNDING_MODE1", "ROUNDING_MODE2".SEL_PATTERN("PATTERN"), // Select pattern value ("PATTERN" or "C").USE_PATTERN_DETECT("NO_PATDET"), // Enable pattern detect ("PATDET" or "NO_PATDET")// Register Control Attributes: Pipeline Register Configuration.ACASCREG(0), //.ADREG(1), // Number of pipeline stages for pre-adder (0 or 1).ALUMODEREG(0), // Number of pipeline stages for ALUMODE (0 or 1).AREG(0), // Number of pipeline stages for A (0, 1 or 2) .BCASCREG(0), // Number of pipeline stages between B/BCIN and BCOUT (0, 1 or 2).BREG(0), // Number of pipeline stages for B (0, 1 or 2).CARRYINREG(0), // Number of pipeline stages for CARRYIN (0 or 1).CARRYINSELREG(0), // Number of pipeline stages for CARRYINSEL (0 or 1).CREG(1), // Number of pipeline stages for C (0 or 1).DREG(1), // Number of pipeline stages for D (0 or 1).INMODEREG(0), // Number of pipeline stages for INMODE (0 or 1).MREG(0), // Number of multiplier pipeline stages (0 or 1) .OPMODEREG(0), // Number of pipeline stages for OPMODE (0 or 1).PREG(0) // Number of pipeline stages for P (0 or 1))DSP48E1_inst (// Cascade: 30-bit (each) output: Cascade Ports.ACOUT(acout), // 30-bit output: A port cascade output.BCOUT(bcout), // 18-bit output: B port cascade output.CARRYCASCOUT(carrycasout), // 1-bit output: Cascade carry output.MULTSIGNOUT(), // 1-bit output: Multiplier sign cascade output.PCOUT(pcout), // 48-bit output: Cascade output//这些引脚空着就好// Control: 1-bit (each) output: Control Inputs/Status Bits.OVERFLOW(), // 1-bit output: Overflow in add/acc output.PATTERNBDETECT(), // 1-bit output: Pattern bar detect output.PATTERNDETECT(), // 1-bit output: Pattern detect output.UNDERFLOW(), // 1-bit output: Underflow in add/acc output//这些引脚也空着，没用// Data: 4-bit (each) output: Data Ports.CARRYOUT(carryout), // 4-bit output: Carry output.P(o), // 48-bit output: Primary data output//P输出48bit的// Cascade: 30-bit (each) input: Cascade Ports.ACIN(30'b0), // 30-bit input: A cascade data input.BCIN(18'b0), // 18-bit input: B cascade input.CARRYCASCIN(1'b0), // 1-bit input: Cascade carry input.MULTSIGNIN(1'b0), // 1-bit input: Multiplier sign input.PCIN(48'b0), // 48-bit input: P cascade input//这些引脚很重要，做流水线时，数据又这几个引脚输入。// Control: 4-bit (each) input: Control Inputs/Status Bits.ALUMODE(4'b0), // 4-bit input: ALU control input.CARRYINSEL(3'b0), // 3-bit input: Carry select input.CLK(0), // 1-bit input: Clock input .INMODE(5'b0), // 5-bit input: INMODE control input.OPMODE(7'b0000101), // 7-bit input: Operation mode input// Data: 30-bit (each) input: Data Ports.A(in1), // 30-bit input: A data input.B(in2), // 18-bit input: B data input.C(48'hffffffffffff), // 48-bit input: C data input.CARRYIN(1'b0), // 1-bit input: Carry input signal.D(25'b0), // 25-bit input: D data input// Reset/Clock Enable: 1-bit (each) input: Reset/Clock Enable Inputs.CEA1(1'b0), // 1-bit input: Clock enable input for 1st stage AREG.CEA2(1'b0), // 1-bit input: Clock enable input for 2nd stage AREG.CEAD(1'b0), // 1-bit input: Clock enable input for ADREG.CEALUMODE(1'b0), // 1-bit input: Clock enable input for ALUMODE.CEB1(1'b0), // 1-bit input: Clock enable input for 1st stage BREG.CEB2(1'b0), // 1-bit input: Clock enable input for 2nd stage BREG.CEC(1'b0), // 1-bit input: Clock enable input for CREG.CECARRYIN(1'b0), // 1-bit input: Clock enable input for CARRYINREG.CECTRL(1'b0), // 1-bit input: Clock enable input for OPMODEREG and CARRYINSELREG.CED(1'b0), // 1-bit input: Clock enable input for DREG.CEINMODE(1'b0), // 1-bit input: Clock enable input for INMODEREG.CEM(1'b0), // 1-bit input: Clock enable input for MREG.CEP(1'b0), // 1-bit input: Clock enable input for PREG.RSTA(1'b0), // 1-bit input: Reset input for AREG.RSTALLCARRYIN(1'b0), // 1-bit input: Reset input for CARRYINREG.RSTALUMODE(1'b0), // 1-bit input: Reset input for ALUMODEREG.RSTB(1'b0), // 1-bit input: Reset input for BREG.RSTC(1'b0), // 1-bit input: Reset input for CREG.RSTCTRL(1'b0), // 1-bit input: Reset input for OPMODEREG and CARRYINSELREG.RSTD(1'b0), // 1-bit input: Reset input for DREG and ADREG.RSTINMODE(1'b0), // 1-bit input: Reset input for INMODEREG.RSTM(1'b0), // 1-bit input: Reset input for MREG.RSTP(1'b0) // 1-bit input: Reset input for PREG);endmodulemodule bitstream_tb;reg rst;reg dec_clk;reg signed [24:0] a;reg signed [17:0] b;reg signed [47:0] d;reg signed [47:0] c;wire signed [47:0] p;wire signed [29:0] ac;wire signed [17:0] bc;wire [3:0] co;wire [3:0] ccas;wire signed [47:0] pc;initial beginrst = 0;#200 a = 100;#0 b = 200;#0 d = 45;#0 c = 400;#50 rst = 1;#1 rst = 0;#100 $display("p %d",p);endalwaysbegin#1 dec_clk = 0;#1 dec_clk = 1;endtest test_inst(.clk(dec_clk),.rst(rst),.in1(a),.in2(b),.o(p),.acout(ac),.bcout(bc),.carryout(co),.carrycasout(ccas),.pcout(pc));endmodule
2 o <=in1*in2 延迟1周期出结果
和上面的唯一区别仅仅是是MREG=1，CEM=1,
注意CEM一定要等于1，否则结果是0
同样如果AREG=1, CEA要等于1，clock enable一定要相应置起来
延迟周期，也可以选择AREG，PREG这些，或者这些的组合，延迟多周期
`timescale 1ns / 10ps // timescale time_unit/time_presicionmodule test(input wire clk,input wire rst,input wire signed [24:0] in1,input wire signed [17:0] in2,output wire signed [47:0] o,output wire signed [29:0] acout,output wire signed [17:0] bcout,output wire [3:0] carryout,output wire [3:0] carrycasout,output wire signed [47:0] pcout);DSP48E1 #(.A_INPUT("DIRECT"),.B_INPUT("DIRECT"),.USE_DPORT("FALSE"),.USE_MULT("MULTIPLY"),.USE_SIMD("ONE48"),.AUTORESET_PATDET("NO_RESET"), // "NO_RESET", "RESET_MATCH", "RESET_NOT_MATCH".MASK(48'h3fffffffffff), // 48-bit mask value for pattern detect (1=ignore).PATTERN(48'h000000000000), // 48-bit pattern match for pattern detect.SEL_MASK("MASK"), // "C", "MASK", "ROUNDING_MODE1", "ROUNDING_MODE2".SEL_PATTERN("PATTERN"), // Select pattern value ("PATTERN" or "C").USE_PATTERN_DETECT("NO_PATDET"), // Enable pattern detect ("PATDET" or "NO_PATDET")// Register Control Attributes: Pipeline Register Configuration.ACASCREG(0), //.ADREG(1), // Number of pipeline stages for pre-adder (0 or 1).ALUMODEREG(0), // Number of pipeline stages for ALUMODE (0 or 1).AREG(0), // Number of pipeline stages for A (0, 1 or 2) .BCASCREG(0), // Number of pipeline stages between B/BCIN and BCOUT (0, 1 or 2).BREG(0), // Number of pipeline stages for B (0, 1 or 2).CARRYINREG(0), // Number of pipeline stages for CARRYIN (0 or 1).CARRYINSELREG(0), // Number of pipeline stages for CARRYINSEL (0 or 1).CREG(1), // Number of pipeline stages for C (0 or 1).DREG(1), // Number of pipeline stages for D (0 or 1).INMODEREG(0), // Number of pipeline stages for INMODE (0 or 1).MREG(1), // Number of multiplier pipeline stages (0 or 1) .OPMODEREG(0), // Number of pipeline stages for OPMODE (0 or 1).PREG(0) // Number of pipeline stages for P (0 or 1))DSP48E1_inst (// Cascade: 30-bit (each) output: Cascade Ports.ACOUT(acout), // 30-bit output: A port cascade output.BCOUT(bcout), // 18-bit output: B port cascade output.CARRYCASCOUT(carrycasout), // 1-bit output: Cascade carry output.MULTSIGNOUT(), // 1-bit output: Multiplier sign cascade output.PCOUT(pcout), // 48-bit output: Cascade output//这些引脚空着就好// Control: 1-bit (each) output: Control Inputs/Status Bits.OVERFLOW(), // 1-bit output: Overflow in add/acc output.PATTERNBDETECT(), // 1-bit output: Pattern bar detect output.PATTERNDETECT(), // 1-bit output: Pattern detect output.UNDERFLOW(), // 1-bit output: Underflow in add/acc output//这些引脚也空着，没用// Data: 4-bit (each) output: Data Ports.CARRYOUT(carryout), // 4-bit output: Carry output.P(o), // 48-bit output: Primary data output//P输出48bit的// Cascade: 30-bit (each) input: Cascade Ports.ACIN(30'b0), // 30-bit input: A cascade data input.BCIN(18'b0), // 18-bit input: B cascade input.CARRYCASCIN(1'b0), // 1-bit input: Cascade carry input.MULTSIGNIN(1'b0), // 1-bit input: Multiplier sign input.PCIN(48'b0), // 48-bit input: P cascade input//这些引脚很重要，做流水线时，数据又这几个引脚输入。// Control: 4-bit (each) input: Control Inputs/Status Bits.ALUMODE(4'b0), // 4-bit input: ALU control input.CARRYINSEL(3'b0), // 3-bit input: Carry select input.CLK(clk), // 1-bit input: Clock input .INMODE(5'b0), // 5-bit input: INMODE control input.OPMODE(7'b0000101), // 7-bit input: Operation mode input// Data: 30-bit (each) input: Data Ports.A(in1), // 30-bit input: A data input.B(in2), // 18-bit input: B data input.C(48'hffffffffffff), // 48-bit input: C data input.CARRYIN(1'b0), // 1-bit input: Carry input signal.D(25'b0), // 25-bit input: D data input// Reset/Clock Enable: 1-bit (each) input: Reset/Clock Enable Inputs.CEA1(1'b0), // 1-bit input: Clock enable input for 1st stage AREG.CEA2(1'b0), // 1-bit input: Clock enable input for 2nd stage AREG.CEAD(1'b0), // 1-bit input: Clock enable input for ADREG.CEALUMODE(1'b0), // 1-bit input: Clock enable input for ALUMODE.CEB1(1'b0), // 1-bit input: Clock enable input for 1st stage BREG.CEB2(1'b0), // 1-bit input: Clock enable input for 2nd stage BREG.CEC(1'b0), // 1-bit input: Clock enable input for CREG.CECARRYIN(1'b0), // 1-bit input: Clock enable input for CARRYINREG.CECTRL(1'b0), // 1-bit input: Clock enable input for OPMODEREG and CARRYINSELREG.CED(1'b0), // 1-bit input: Clock enable input for DREG.CEINMODE(1'b0), // 1-bit input: Clock enable input for INMODEREG.CEM(1'b1), // 1-bit input: Clock enable input for MREG.CEP(1'b0), // 1-bit input: Clock enable input for PREG.RSTA(1'b0), // 1-bit input: Reset input for AREG.RSTALLCARRYIN(1'b0), // 1-bit input: Reset input for CARRYINREG.RSTALUMODE(1'b0), // 1-bit input: Reset input for ALUMODEREG.RSTB(1'b0), // 1-bit input: Reset input for BREG.RSTC(1'b0), // 1-bit input: Reset input for CREG.RSTCTRL(1'b0), // 1-bit input: Reset input for OPMODEREG and CARRYINSELREG.RSTD(1'b0), // 1-bit input: Reset input for DREG and ADREG.RSTINMODE(1'b0), // 1-bit input: Reset input for INMODEREG.RSTM(1'b0), // 1-bit input: Reset input for MREG.RSTP(1'b0) // 1-bit input: Reset input for PREG);endmodulemodule bitstream_tb;reg rst;reg dec_clk;reg signed [24:0] a;reg signed [17:0] b;reg signed [47:0] d;reg signed [47:0] c;wire signed [47:0] p;wire signed [29:0] ac;wire signed [17:0] bc;wire [3:0] co;wire [3:0] ccas;wire signed [47:0] pc;initial beginrst = 0;#200 a = 100;#0 b = 200;#0 d = 45;#0 c = 400;#50 rst = 1;#1 rst = 0;#100 $display("p %d",p);endalwaysbegin#1 dec_clk = 0;#1 dec_clk = 1;endtest test_inst(.clk(dec_clk),.rst(rst),.in1(a),.in2(b),.o(p),.acout(ac),.bcout(bc),.carryout(co),.carrycasout(ccas),.pcout(pc));endmodule
3 o <= in1*in2+c
OPMODE=7'b0110101
`timescale 1ns / 10ps // timescale time_unit/time_presicionmodule test(input wire clk,input wire rst,input wire signed [24:0] in1,input wire signed [17:0] in2,input wire signed [47:0] c,output wire signed [47:0] o,output wire signed [29:0] acout,output wire signed [17:0] bcout,output wire [3:0] carryout,output wire [3:0] carrycasout,output wire signed [47:0] pcout);DSP48E1 #(.A_INPUT("DIRECT"),.B_INPUT("DIRECT"),.USE_DPORT("FALSE"),.USE_MULT("MULTIPLY"), .USE_SIMD("ONE48"), .AUTORESET_PATDET("NO_RESET"), // "NO_RESET", "RESET_MATCH", "RESET_NOT_MATCH".MASK(48'h3fffffffffff), // 48-bit mask value for pattern detect (1=ignore).PATTERN(48'h000000000000), // 48-bit pattern match for pattern detect.SEL_MASK("MASK"), // "C", "MASK", "ROUNDING_MODE1", "ROUNDING_MODE2".SEL_PATTERN("PATTERN"), // Select pattern value ("PATTERN" or "C").USE_PATTERN_DETECT("NO_PATDET"), // Enable pattern detect ("PATDET" or "NO_PATDET")// Register Control Attributes: Pipeline Register Configuration.ACASCREG(0), //.ADREG(1), // Number of pipeline stages for pre-adder (0 or 1).ALUMODEREG(0), // Number of pipeline stages for ALUMODE (0 or 1).AREG(0), // Number of pipeline stages for A (0, 1 or 2) .BCASCREG(0), // Number of pipeline stages between B/BCIN and BCOUT (0, 1 or 2).BREG(0), // Number of pipeline stages for B (0, 1 or 2).CARRYINREG(0), // Number of pipeline stages for CARRYIN (0 or 1).CARRYINSELREG(0), // Number of pipeline stages for CARRYINSEL (0 or 1).CREG(0), // Number of pipeline stages for C (0 or 1).DREG(0), // Number of pipeline stages for D (0 or 1).INMODEREG(1), // Number of pipeline stages for INMODE (0 or 1).MREG(0), // Number of multiplier pipeline stages (0 or 1).OPMODEREG(0), // Number of pipeline stages for OPMODE (0 or 1).PREG(1) // Number of pipeline stages for P (0 or 1))DSP48E1_inst (// Cascade: 30-bit (each) output: Cascade Ports.ACOUT(acout), // 30-bit output: A port cascade output.BCOUT(bcout), // 18-bit output: B port cascade output.CARRYCASCOUT(carrycasout), // 1-bit output: Cascade carry output.MULTSIGNOUT(), // 1-bit output: Multiplier sign cascade output.PCOUT(pcout), // 48-bit output: Cascade output//这些引脚空着就好// Control: 1-bit (each) output: Control Inputs/Status Bits.OVERFLOW(), // 1-bit output: Overflow in add/acc output.PATTERNBDETECT(), // 1-bit output: Pattern bar detect output.PATTERNDETECT(), // 1-bit output: Pattern detect output.UNDERFLOW(), // 1-bit output: Underflow in add/acc output//这些引脚也空着，没用// Data: 4-bit (each) output: Data Ports.CARRYOUT(carryout), // 4-bit output: Carry output.P(o), // 48-bit output: Primary data output//P输出48bit的// Cascade: 30-bit (each) input: Cascade Ports.ACIN(30'b0), // 30-bit input: A cascade data input.BCIN(18'b0), // 18-bit input: B cascade input.CARRYCASCIN(1'b0), // 1-bit input: Cascade carry input.MULTSIGNIN(1'b0), // 1-bit input: Multiplier sign input.PCIN(48'b0), // 48-bit input: P cascade input//这些引脚很重要，做流水线时，数据又这几个引脚输入。// Control: 4-bit (each) input: Control Inputs/Status Bits.ALUMODE(4'b0), // 4-bit input: ALU control input.CARRYINSEL(3'b0), // 3-bit input: Carry select input.CLK(clk), // 1-bit input: Clock input.INMODE(5'b0), // 5-bit input: INMODE control input.OPMODE(7'b0110101), // 7-bit input: Operation mode input// Data: 30-bit (each) input: Data Ports.A(in1), // 30-bit input: A data input.B(in2), // 18-bit input: B data input//.C(48'hffffffffffff), // 48-bit input: C data input.C(c), // 48-bit input: C data input.CARRYIN(1'b0), // 1-bit input: Carry input signal.D(25'b0), // 25-bit input: D data input// Reset/Clock Enable: 1-bit (each) input: Reset/Clock Enable Inputs.CEA1(1'b0), // 1-bit input: Clock enable input for 1st stage AREG.CEA2(1'b0), // 1-bit input: Clock enable input for 2nd stage AREG.CEAD(1'b0), // 1-bit input: Clock enable input for ADREG.CEALUMODE(1'b0), // 1-bit input: Clock enable input for ALUMODE.CEB1(1'b0), // 1-bit input: Clock enable input for 1st stage BREG.CEB2(1'b0), // 1-bit input: Clock enable input for 2nd stage BREG.CEC(1'b0), // 1-bit input: Clock enable input for CREG.CECARRYIN(1'b0), // 1-bit input: Clock enable input for CARRYINREG.CECTRL(1'b0), // 1-bit input: Clock enable input for OPMODEREG and CARRYINSELREG.CED(1'b0), // 1-bit input: Clock enable input for DREG.CEINMODE(1'b0), // 1-bit input: Clock enable input for INMODEREG.CEM(1'b0), // 1-bit input: Clock enable input for MREG.CEP(1'b1), // 1-bit input: Clock enable input for PREG.RSTA(rst),.RSTALLCARRYIN(rst),.RSTALUMODE(rst),.RSTB(rst),.RSTC(rst),.RSTCTRL(rst),.RSTD(rst),.RSTINMODE(rst),.RSTM(rst),.RSTP(rst));endmodulemodule bitstream_tb;reg rst;reg dec_clk;reg signed [24:0] a;reg signed [17:0] b;reg signed [47:0] d;reg signed [47:0] c;wire signed [47:0] p;wire signed [29:0] ac;wire signed [17:0] bc;wire [3:0] co;wire [3:0] ccas;wire signed [47:0] pc;initial beginrst = 0;#200 a = 100;#0 b = 200;#0 d = 45;#0 c = 400;#50 rst = 1;#1 rst = 0;#100 $display("p %d",p);endalwaysbegin#1 dec_clk = 0;#1 dec_clk = 1;endtest test_inst(.clk(dec_clk),.rst(rst),.in1(a),.in2(b),.c(c),.o(p),.acout(ac),.bcout(bc),.carryout(co),.carrycasout(ccas),.pcout(pc));endmodule
4 o <= c-in1*in2
和o <= in1*in2+c的区别是ALUMODE选0011
`timescale 1ns / 10ps // timescale time_unit/time_presicionmodule test(input wire clk,input wire rst,input wire signed [24:0] in1,input wire signed [17:0] in2,input wire signed [47:0] c,output wire signed [47:0] o,output wire signed [29:0] acout,output wire signed [17:0] bcout,output wire [3:0] carryout,output wire [3:0] carrycasout,output wire signed [47:0] pcout);DSP48E1 #(.A_INPUT("DIRECT"),.B_INPUT("DIRECT"),.USE_DPORT("FALSE"),.USE_MULT("MULTIPLY"), .USE_SIMD("ONE48"), .AUTORESET_PATDET("NO_RESET"), // "NO_RESET", "RESET_MATCH", "RESET_NOT_MATCH".MASK(48'h3fffffffffff), // 48-bit mask value for pattern detect (1=ignore).PATTERN(48'h000000000000), // 48-bit pattern match for pattern detect.SEL_MASK("MASK"), // "C", "MASK", "ROUNDING_MODE1", "ROUNDING_MODE2".SEL_PATTERN("PATTERN"), // Select pattern value ("PATTERN" or "C").USE_PATTERN_DETECT("NO_PATDET"), // Enable pattern detect ("PATDET" or "NO_PATDET")// Register Control Attributes: Pipeline Register Configuration.ACASCREG(0), //.ADREG(1), // Number of pipeline stages for pre-adder (0 or 1).ALUMODEREG(0), // Number of pipeline stages for ALUMODE (0 or 1).AREG(0), // Number of pipeline stages for A (0, 1 or 2) .BCASCREG(0), // Number of pipeline stages between B/BCIN and BCOUT (0, 1 or 2).BREG(0), // Number of pipeline stages for B (0, 1 or 2).CARRYINREG(0), // Number of pipeline stages for CARRYIN (0 or 1).CARRYINSELREG(0), // Number of pipeline stages for CARRYINSEL (0 or 1).CREG(0), // Number of pipeline stages for C (0 or 1).DREG(0), // Number of pipeline stages for D (0 or 1).INMODEREG(1), // Number of pipeline stages for INMODE (0 or 1).MREG(0), // Number of multiplier pipeline stages (0 or 1).OPMODEREG(0), // Number of pipeline stages for OPMODE (0 or 1).PREG(1) // Number of pipeline stages for P (0 or 1))DSP48E1_inst (// Cascade: 30-bit (each) output: Cascade Ports.ACOUT(acout), // 30-bit output: A port cascade output.BCOUT(bcout), // 18-bit output: B port cascade output.CARRYCASCOUT(carrycasout), // 1-bit output: Cascade carry output.MULTSIGNOUT(), // 1-bit output: Multiplier sign cascade output.PCOUT(pcout), // 48-bit output: Cascade output//这些引脚空着就好// Control: 1-bit (each) output: Control Inputs/Status Bits.OVERFLOW(), // 1-bit output: Overflow in add/acc output.PATTERNBDETECT(), // 1-bit output: Pattern bar detect output.PATTERNDETECT(), // 1-bit output: Pattern detect output.UNDERFLOW(), // 1-bit output: Underflow in add/acc output//这些引脚也空着，没用// Data: 4-bit (each) output: Data Ports.CARRYOUT(carryout), // 4-bit output: Carry output.P(o), // 48-bit output: Primary data output//P输出48bit的// Cascade: 30-bit (each) input: Cascade Ports.ACIN(30'b0), // 30-bit input: A cascade data input.BCIN(18'b0), // 18-bit input: B cascade input.CARRYCASCIN(1'b0), // 1-bit input: Cascade carry input.MULTSIGNIN(1'b0), // 1-bit input: Multiplier sign input.PCIN(48'b0), // 48-bit input: P cascade input//这些引脚很重要，做流水线时，数据又这几个引脚输入。// Control: 4-bit (each) input: Control Inputs/Status Bits.ALUMODE(4'b0011), // 4-bit input: ALU control input.CARRYINSEL(3'b0), // 3-bit input: Carry select input.CLK(clk), // 1-bit input: Clock input.INMODE(5'b0), // 5-bit input: INMODE control input.OPMODE(7'b0110101), // 7-bit input: Operation mode input// Data: 30-bit (each) input: Data Ports.A(in1), // 30-bit input: A data input.B(in2), // 18-bit input: B data input//.C(48'hffffffffffff), // 48-bit input: C data input.C(c), // 48-bit input: C data input.CARRYIN(1'b0), // 1-bit input: Carry input signal.D(25'b0), // 25-bit input: D data input// Reset/Clock Enable: 1-bit (each) input: Reset/Clock Enable Inputs.CEA1(1'b0), // 1-bit input: Clock enable input for 1st stage AREG.CEA2(1'b0), // 1-bit input: Clock enable input for 2nd stage AREG.CEAD(1'b0), // 1-bit input: Clock enable input for ADREG.CEALUMODE(1'b0), // 1-bit input: Clock enable input for ALUMODE.CEB1(1'b0), // 1-bit input: Clock enable input for 1st stage BREG.CEB2(1'b0), // 1-bit input: Clock enable input for 2nd stage BREG.CEC(1'b0), // 1-bit input: Clock enable input for CREG.CECARRYIN(1'b0), // 1-bit input: Clock enable input for CARRYINREG.CECTRL(1'b0), // 1-bit input: Clock enable input for OPMODEREG and CARRYINSELREG.CED(1'b0), // 1-bit input: Clock enable input for DREG.CEINMODE(1'b0), // 1-bit input: Clock enable input for INMODEREG.CEM(1'b0), // 1-bit input: Clock enable input for MREG.CEP(1'b1), // 1-bit input: Clock enable input for PREG.RSTA(rst),.RSTALLCARRYIN(rst),.RSTALUMODE(rst),.RSTB(rst),.RSTC(rst),.RSTCTRL(rst),.RSTD(rst),.RSTINMODE(rst),.RSTM(rst),.RSTP(rst));endmodulemodule bitstream_tb;reg rst;reg dec_clk;reg signed [24:0] a;reg signed [17:0] b;reg signed [47:0] d;reg signed [47:0] c;wire signed [47:0] p;wire signed [29:0] ac;wire signed [17:0] bc;wire [3:0] co;wire [3:0] ccas;wire signed [47:0] pc;initial beginrst = 0;#200 a = 10;#0 b = 20;#0 d = 45;#0 c = 400;#50 rst = 1;#1 rst = 0;#100 $display("p %d",p);endalwaysbegin#1 dec_clk = 0;#1 dec_clk = 1;endtest test_inst(.clk(dec_clk),.rst(rst),.in1(a),.in2(b),.c(c),.o(p),.acout(ac),.bcout(bc),.carryout(co),.carrycasout(ccas),.pcout(pc));endmodule
5 o <= o+in1*in2 累加操作
OPMODE=7'b0100101
`timescale 1ns / 10ps // timescale time_unit/time_presicionmodule test(input wire clk,input wire rst,input wire signed [24:0] in1,input wire signed [17:0] in2,input wire signed [47:0] c,output wire signed [47:0] o,output wire signed [29:0] acout,output wire signed [17:0] bcout,output wire [3:0] carryout,output wire [3:0] carrycasout,output wire signed [47:0] pcout);DSP48E1 #(.A_INPUT("DIRECT"),.B_INPUT("DIRECT"),.USE_DPORT("FALSE"),.USE_MULT("MULTIPLY"), .USE_SIMD("ONE48"), .AUTORESET_PATDET("NO_RESET"), // "NO_RESET", "RESET_MATCH", "RESET_NOT_MATCH".MASK(48'h3fffffffffff), // 48-bit mask value for pattern detect (1=ignore).PATTERN(48'h000000000000), // 48-bit pattern match for pattern detect.SEL_MASK("MASK"), // "C", "MASK", "ROUNDING_MODE1", "ROUNDING_MODE2".SEL_PATTERN("PATTERN"), // Select pattern value ("PATTERN" or "C").USE_PATTERN_DETECT("NO_PATDET"), // Enable pattern detect ("PATDET" or "NO_PATDET")// Register Control Attributes: Pipeline Register Configuration.ACASCREG(0), //.ADREG(1), // Number of pipeline stages for pre-adder (0 or 1).ALUMODEREG(0), // Number of pipeline stages for ALUMODE (0 or 1).AREG(0), // Number of pipeline stages for A (0, 1 or 2) .BCASCREG(0), // Number of pipeline stages between B/BCIN and BCOUT (0, 1 or 2).BREG(0), // Number of pipeline stages for B (0, 1 or 2).CARRYINREG(0), // Number of pipeline stages for CARRYIN (0 or 1).CARRYINSELREG(0), // Number of pipeline stages for CARRYINSEL (0 or 1).CREG(0), // Number of pipeline stages for C (0 or 1).DREG(0), // Number of pipeline stages for D (0 or 1).INMODEREG(1), // Number of pipeline stages for INMODE (0 or 1).MREG(0), // Number of multiplier pipeline stages (0 or 1).OPMODEREG(0), // Number of pipeline stages for OPMODE (0 or 1).PREG(1) // Number of pipeline stages for P (0 or 1))DSP48E1_inst (// Cascade: 30-bit (each) output: Cascade Ports.ACOUT(acout), // 30-bit output: A port cascade output.BCOUT(bcout), // 18-bit output: B port cascade output.CARRYCASCOUT(carrycasout), // 1-bit output: Cascade carry output.MULTSIGNOUT(), // 1-bit output: Multiplier sign cascade output.PCOUT(pcout), // 48-bit output: Cascade output//这些引脚空着就好// Control: 1-bit (each) output: Control Inputs/Status Bits.OVERFLOW(), // 1-bit output: Overflow in add/acc output.PATTERNBDETECT(), // 1-bit output: Pattern bar detect output.PATTERNDETECT(), // 1-bit output: Pattern detect output.UNDERFLOW(), // 1-bit output: Underflow in add/acc output//这些引脚也空着，没用// Data: 4-bit (each) output: Data Ports.CARRYOUT(carryout), // 4-bit output: Carry output.P(o), // 48-bit output: Primary data output//P输出48bit的// Cascade: 30-bit (each) input: Cascade Ports.ACIN(30'b0), // 30-bit input: A cascade data input.BCIN(18'b0), // 18-bit input: B cascade input.CARRYCASCIN(1'b0), // 1-bit input: Cascade carry input.MULTSIGNIN(1'b0), // 1-bit input: Multiplier sign input.PCIN(48'b0), // 48-bit input: P cascade input//这些引脚很重要，做流水线时，数据又这几个引脚输入。// Control: 4-bit (each) input: Control Inputs/Status Bits.ALUMODE(4'b0), // 4-bit input: ALU control input.CARRYINSEL(3'b0), // 3-bit input: Carry select input.CLK(clk), // 1-bit input: Clock input.INMODE(5'b0), // 5-bit input: INMODE control input.OPMODE(7'b0100101), // 7-bit input: Operation mode input// Data: 30-bit (each) input: Data Ports.A(in1), // 30-bit input: A data input.B(in2), // 18-bit input: B data input//.C(48'hffffffffffff), // 48-bit input: C data input.C(c), // 48-bit input: C data input.CARRYIN(1'b0), // 1-bit input: Carry input signal.D(25'b0), // 25-bit input: D data input// Reset/Clock Enable: 1-bit (each) input: Reset/Clock Enable Inputs.CEA1(1'b0), // 1-bit input: Clock enable input for 1st stage AREG.CEA2(1'b0), // 1-bit input: Clock enable input for 2nd stage AREG.CEAD(1'b0), // 1-bit input: Clock enable input for ADREG.CEALUMODE(1'b0), // 1-bit input: Clock enable input for ALUMODE.CEB1(1'b0), // 1-bit input: Clock enable input for 1st stage BREG.CEB2(1'b0), // 1-bit input: Clock enable input for 2nd stage BREG.CEC(1'b0), // 1-bit input: Clock enable input for CREG.CECARRYIN(1'b0), // 1-bit input: Clock enable input for CARRYINREG.CECTRL(1'b0), // 1-bit input: Clock enable input for OPMODEREG and CARRYINSELREG.CED(1'b0), // 1-bit input: Clock enable input for DREG.CEINMODE(1'b0), // 1-bit input: Clock enable input for INMODEREG.CEM(1'b0), // 1-bit input: Clock enable input for MREG.CEP(1'b1), // 1-bit input: Clock enable input for PREG.RSTA(rst),.RSTALLCARRYIN(rst),.RSTALUMODE(rst),.RSTB(rst),.RSTC(rst),.RSTCTRL(rst),.RSTD(rst),.RSTINMODE(rst),.RSTM(rst),.RSTP(rst));endmodulemodule bitstream_tb;reg rst;reg dec_clk;reg signed [24:0] a;reg signed [17:0] b;reg signed [47:0] d;reg signed [47:0] c;wire signed [47:0] p;wire signed [29:0] ac;wire signed [17:0] bc;wire [3:0] co;wire [3:0] ccas;wire signed [47:0] pc;initial beginrst = 0;#200 a = 100;#0 b = 200;#0 d = 45;#0 c = 400;#50 rst = 1;#1 rst = 0;#100 $display("p %d",p);endalwaysbegin#1 dec_clk = 0;#1 dec_clk = 1;endtest test_inst(.clk(dec_clk),.rst(rst),.in1(a),.in2(b),.c(c),.o(p),.acout(ac),.bcout(bc),.carryout(co),.carrycasout(ccas),.pcout(pc));endmodule
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