西工大数字集成电路实验四、译码器的设计及延迟估算

1、数字集成电路实验报告西北工业大学 2014年5月21日 星期三实验四、译码器的设计及延迟估算1、设计译码器并估算延迟设计一个用于16bit寄存器堆的译码器，每一个寄存器有32bit的宽度，每个bit的寄存器单元形成的负载可以等效为3个单位化的晶体管(后面提到负载都为单位化后的负载)。提示：可以首先假定每一级的逻辑努力为1，考虑到存在四输入的与非门也可考虑假设总的逻辑努力为2，从而确定译码器的级数。 译码器的结构可参考典型的4-16译码器 假定4个寄存器地址位的正反8个输入信号，每个信号的输入负载可以等效为10。确定译码器的级数，并计算相关逻辑努力，以此来确定每一级中晶体管的尺寸（相当于多少个单

2、位化的晶体管）及整个译码电路的延迟(以单位反相器的延迟的本征延迟Tp0为单位)。答：,假定每一级的逻辑努力：G=1，又因为分支努力(每个信号连接8个与非门)：，路径努力所以，使用最优锥形系数就可得到最佳的电路级数,故N取3级。因为逻辑努力：；路径努力：则使得路径延时最小的门努力 。所以：第一级晶体管尺寸为 10；故第二级晶体管尺寸为；第三级尺寸为；故延迟为： 如果在四个寄存器地址输入的时候，只有正信号，反信号必须从正信号来获得。每个正信号的输入的等效负载为20,使用与中同样的译码结构，在这种条件下确定晶体管的大小并评估延迟(以单位反相器的延迟的本征延迟Tp0为单位)。答：因为输入时通过两级反相

3、器，使这两个反相器分摊原来单个反相器的等效扇出，将两级反相器等效为一级，故其逻辑努力,故所以：第一级尺寸为：第二级尺寸为：第三级尺寸为：第四级尺寸为：正信号通路的延迟为： 反信号通路情况与上问相同，延迟为s译码器和寄存器堆的连接情况(Output输出为1的一行寄存器被选中)2、根据单位反相器(NMOS:W=0.5u L=0.5u PMOS:W=1.8u L=0.5u)，设计出实际电路，并仿真1题中第一问的路径延迟。 仿真结果如下：手工测量结果为：tp = 9.4413E-08为了简单起见，所有晶体管采用最小尺寸代码如下：.TITLE EXERCISE 4 CMOS INVERTER(The f

4、irst).options probe.options tnom = 25.options post acct probe accurate.options ingold = 2 limpts = 30000 method = gear *ingold：输出数据格式 limpts：AC分析中设置总点数 method：算法.options lvltime = 2 imax = 20 gmindc=1.0e-12 *lvltime:选择时间步长算法 imax：最大时间步长gmindc：DC分析时用到的与PN结并联的电导.protect .lib'C:EricDigital Integrat

5、ed Circuitexperiment 3cmos25_level49.lib' TT.unprotect.TRAN 200P 60N MNMOS_10 N_18 N_15 N_17 N_17 NMOS W=0.5u L=0.5u MNMOS_11 Y10 N_5 N_18 N_18 NMOS W=0.5u L=0.5u MNMOS_12 N_16 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_13 N_21 N_8 N_20 N_20 NMOS W=0.5u L=0.5u MNMOS_14 N_22 N_15 N_21 N_21 NMOS W=0.5u

6、L=0.5u MNMOS_15 Y11 N_10 N_22 N_22 NMOS W=0.5u L=0.5u MNMOS_16 N_20 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_17 N_26 N_24 N_25 N_25 NMOS W=0.5u L=0.5u MNMOS_18 N_27 N_7 N_26 N_26 NMOS W=0.5u L=0.5u MNMOS_19 Y12 N_5 N_27 N_27 NMOS W=0.5u L=0.5u MNMOS_20 N_25 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_21 N_30 N

7、_10 N_29 N_29 NMOS W=0.5u L=0.5u MNMOS_22 N_31 N_24 N_30 N_30 NMOS W=0.5u L=0.5u MNMOS_23 Y13 N_7 N_31 N_31 NMOS W=0.5u L=0.5u MNMOS_24 N_29 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_25 N_34 N_15 N_33 N_33 NMOS W=0.5u L=0.5u MNMOS_26 N_35 N_24 N_34 N_34 NMOS W=0.5u L=0.5u MNMOS_27 Y14 N_5 N_35 N_35 NMOS

8、W=0.5u L=0.5u MNMOS_28 N_33 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_29 N_38 N_10 N_37 N_37 NMOS W=0.5u L=0.5u MNMOS_30 N_39 N_15 N_38 N_38 NMOS W=0.5u L=0.5u MNMOS_31 Y15 N_2 N_39 N_39 NMOS W=0.5u L=0.5u MNMOS_32 N_37 N_24 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_33 N_15 N_7 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_34

9、 N_24 N_8 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_35 N_5 A0 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_36 N_10 N_5 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_37 N_7 A1 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_38 N_8 A2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_39 N_44 A3 N_43 N_43 NMOS W=0.5u L=0.5u MNMOS_40 N_43 N_47 N_46 N_46 NMOS W=0.5u L=

10、0.5u MNMOS_41 N_46 N_48 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_42 N_47 Gnd Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_43 N_48 Gnd Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_44 N_2 N_44 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_1 N_1 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_2 Y8 N_5 N_3 N_3 NMOS W=0.5u L=0.5u MNMOS_3 N_3 N_7 N_6 N_6 NMOS

11、W=0.5u L=0.5u MNMOS_4 N_6 N_8 N_1 N_1 NMOS W=0.5u L=0.5u MNMOS_5 N_12 N_8 N_11 N_11 NMOS W=0.5u L=0.5u MNMOS_6 N_13 N_7 N_12 N_12 NMOS W=0.5u L=0.5u MNMOS_7 Y9 N_10 N_13 N_13 NMOS W=0.5u L=0.5uMNMOS_8 N_11 N_2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_9 N_17 N_8 N_16 N_16 NMOS W=0.5u L=0.5uMNMOS_80 N_70 N_36

12、 N_69 N_69 NMOS W=0.5u L=0.5u MNMOS_81 Y0 N_42 N_70 N_70 NMOS W=0.5u L=0.5u MNMOS_82 N_68 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_83 N_71 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_84 Y2 N_42 N_72 N_72 NMOS W=0.5u L=0.5u MNMOS_85 N_72 N_52 N_73 N_73 NMOS W=0.5u L=0.5u MNMOS_86 N_73 N_32 N_71 N_71 NMOS W=0.

13、5u L=0.5u MNMOS_87 N_67 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_88 Y1 N_41 N_66 N_66 NMOS W=0.5u L=0.5u MNMOS_45 N_23 N_9 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_46 N_28 N_19 N_23 N_23 NMOS W=0.5u L=0.5u MNMOS_47 N_14 Vdd N_28 N_28 NMOS W=0.5u L=0.5u MNMOS_48 N_32 A2 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_49 N_36

14、A1 Gnd Gnd NMOS W=0.5u L=0.5uMNMOS_50 N_40 N_14 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_51 N_9 Gnd Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_52 N_19 A3 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_53 N_41 N_42 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_54 N_45 N_49 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_55 Y7 N_40 N_50 N_50 NMOS W=0.5u L=0.5u

15、 MNMOS_56 N_50 N_52 N_51 N_51 NMOS W=0.5u L=0.5u MNMOS_57 N_51 N_41 N_45 N_45 NMOS W=0.5u L=0.5u MNMOS_58 N_42 A0 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_59 N_49 N_32 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_60 N_52 N_36 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_61 N_53 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_62 Y4 N_42 N_54

16、 N_54 NMOS W=0.5u L=0.5u MNMOS_63 N_54 N_36 N_55 N_55 NMOS W=0.5u L=0.5u MNMOS_64 N_55 N_49 N_53 N_53 NMOS W=0.5u L=0.5u MNMOS_65 N_56 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_66 Y3 N_41 N_57 N_57 NMOS W=0.5u L=0.5u MNMOS_67 N_57 N_52 N_58 N_58 NMOS W=0.5u L=0.5u MNMOS_68 N_58 N_32 N_56 N_56 NMOS W=0.5

17、u L=0.5u MNMOS_69 N_59 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_70 Y6 N_42 N_60 N_60 NMOS W=0.5u L=0.5uMNMOS_71 N_60 N_49 N_61 N_61 NMOS W=0.5u L=0.5u MNMOS_72 N_61 N_52 N_59 N_59 NMOS W=0.5u L=0.5u MNMOS_73 N_62 N_40 Gnd Gnd NMOS W=0.5u L=0.5u MNMOS_74 Y5 N_36 N_63 N_63 NMOS W=0.5u L=0.5u MNMOS_75 N_6

18、3 N_49 N_64 N_64 NMOS W=0.5u L=0.5u MNMOS_76 N_64 N_41 N_62 N_62 NMOS W=0.5u L=0.5u MNMOS_77 N_66 N_36 N_65 N_65 NMOS W=0.5u L=0.5u MNMOS_78 N_65 N_32 N_67 N_67 NMOS W=0.5u L=0.5u MNMOS_79 N_69 N_32 N_68 N_68 NMOS W=0.5u L=0.5u MPMOS_1 Y8 N_5 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_2 Y8 N_7 Vdd Vdd PMOS W=

19、1.8u L=0.5u MPMOS_3 Y8 N_8 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_4 Y8 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_5 Y9 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_6 Y9 N_8 Vdd Vdd PMOS W=1.8u L=0.5uMPMOS_7 Y9 N_7 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_8 Y9 N_10 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_9 Y10 N_2 Vdd Vdd PMOS W=1.8u

20、L=0.5u MPMOS_10 Y10 N_8 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_11 Y10 N_15 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_12 Y10 N_5 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_13 Y11 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_14 Y11 N_8 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_15 Y11 N_15 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_16 Y11 N_10 Vdd Vdd P

21、MOS W=1.8u L=0.5u MPMOS_17 Y12 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_18 Y12 N_24 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_19 Y12 N_7 Vdd Vdd PMOS W=1.8u L=0.5uMPMOS_20 Y12 N_5 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_21 Y13 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_22 Y13 N_10 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_23 Y13 N_24

22、 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_24 Y13 N_7 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_25 Y14 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_26 Y14 N_15 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_27 Y14 N_24 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_28 Y14 N_5 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_29 Y15 N_24 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS

23、_30 Y15 N_10 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_31 Y15 N_15 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_32 Y15 N_2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_33 N_15 N_7 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_34 N_10 N_5 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_35 N_24 N_8 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_36 N_5 A0 Vdd Vdd PMOS W=1.8u

24、L=0.5u MPMOS_37 N_7 A1 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_38 N_8 A2 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_39 N_44 A3 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_40 N_44 N_47 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_41 N_44 N_48 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_42 N_47 Gnd Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_43 N_48 Gnd Vdd Vdd

25、PMOS W=1.8u L=0.5u MPMOS_44 N_2 N_44 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_50 N_40 N_14 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_51 N_9 Gnd Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_52 N_19 A3 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_53 N_41 N_42 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_54 Y7 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_55 Y7

26、N_52 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_56 Y7 N_41 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_57 Y7 N_49 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_58 N_42 A0 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_59 N_49 N_32 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_60 N_52 N_36 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_61 Y5 N_41 Vdd Vdd PMOS W=1.8u L=0.5u

27、MPMOS_62 Y5 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_63 Y4 N_42 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_64 Y4 N_36 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_65 Y4 N_49 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_66 Y4 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_67 Y6 N_42 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_68 Y6 N_49 Vdd Vdd PMOS W=1.8u

28、 L=0.5u MPMOS_69 Y6 N_52 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_70 Y6 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_71 Y5 N_36 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_72 Y5 N_49 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_73 Y1 N_41 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_74 Y1 N_36 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_75 Y1 N_32 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_76 Y1 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_77 Y0 N_40 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_78 Y0 N_32 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_79 Y0 N_36 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_80 Y0 N_42 Vdd Vdd PMOS W=1.8u L=0.5u MPMOS_81 Y3 N_41 Vdd Vdd PMOS W=1.8u