esTc 设计中 电子设计自动化技术 教师:李平教授(博导) Email: pliQuestc. edu.cn Te:83201794
设计中心 电子设计自动化技术 教师：李平教授（博导） Email: pli@uestc.edu.cn Tel: 83201794
esTc 设计中 电子设计自动化技术 第五章
设计中心 电子设计自动化技术 第五章
信号赋值语句(并行信号赋值语句) 等待语句 进程语句人顺序信号赋值语句if 描述行为 case」最常用语句 语句 顶序控制晤语句 00p 断言语句 Thile VHDL 块语句 描述语句 子程序 元件语句 描述结构 端口映射语句 语句 生成语句 参数说明语句
设计中心 本章要点
esTc 设计中 What is vhdl Very high speed integrated circuit Hardware Description Language(VHDL) is an industry standard hardware description language description the hardware in language instead of graphic easy to modi ify easy to maintain very good for complex combinational logic BCD to 7 Segment converter address decoding · state machine more than you want
设计中心 What is VHDL • Very high speed integrated circuit Hardware Description Language (VHDL) – is an industry standard hardware description language – description the hardware in language instead of graphic • easy to modify • easy to maintain – very good for • complex combinational logic – BCD to 7 Segment converter – address decoding • state machine • more than you want……
VHDL描述的总体结构 Package Generics Entity Architecture Architecture Architecture (Data Flow) (Behavioral) (structural) oncurrent Concurrent Process tatements Statements Sequential Statements
VHDL设计中心 描述的总体结构
OActive-HDL 4.2 (design not loaded)-E: \MY HOLdesignladdersrelVIDL. O X File Edit Search View Design Simulation Tools Help 》x library ieee: use ieee std logic 1164.all: entity ent name 1s port (pl, p2: in std logic; p3: out std logic vector(7 downto 0)): end entname; architecture arch name of ent name is 10 11 component compnane 12 port (pl: in std logic; 13 p2: out std logio): 14 end component d design flow E whdlstandar R eady Ln TT, Col 67 MUMINS
O Active-HDL 4.2 (design not loaded)-E: \MY _HOLdesignladder\srcWVHDL-Ox File Edit Search view Desi gn Simulation Tools Help 》x 16 signal signame1, signame2: std logic: =U 17 for all: compname use entity work. compname(behave); 19 begin 20 Proc name: process(p1, p2, p3) 21 variable varname1, varname2: std logic :=U 22 23 begin 24 signame l < expression after delay; 56 varname1 : expression; 27 procedure call(paraml, param2, par am3); 28 29 wait for delay: d design flow Ewhdlstandar In77,Co167 NUM INS
O Active-HDL 4.2 (design not loaded)-E: \MY _HOLdesignladder\srcWVHDL-Ox File Edit Search view Desi gn Simulation Tools Help 》x 26 27 procedure call(param1, param2, param); 29 wait for delay Wai语句 30 wait until condition: 1 walt: - wazt o2一- later. 32 33 if condition then |F语句 34 sequential statements 35 elsif condition then 36 sequential statements: 37 else 38 sequential statements 39 end if: d design flow Ewhdlstandar In77,Co167 NUM INS
Wait语句 — — later… - - IF语句
O Active-HDL 4.2 (design not loaded)-E: \MY _HOLdesignladder\srcWVHDL-Ox File Edit Search view Desi gn Simulation Tools Help 》x 40 41 Case吕e1 ection 1s case语句 42 when choice1=> 43 sequential statements: 44 when choice choice3=> 45 sequential statements 46 when others = 47 sequential statements; 48 end case 49 50 for i in a range loop -for循环语句 51 sequential statements: 52 end loop 53 d design flow Ewhdlstandar In21,Co167 NUM INS
- - case语句 - - for循环语句
O Active-HDL 4.2 (design not loaded)-E: \MY _HOLdesignladder\srcWVHDL-Ox File Edit Search view Desi gn Simulation Tools Help 》x 54 while condition loop -Whie循环语句 55 sequential statements 56 condition updates: 57 end loop; 89 end process Proc name; conditional signal assignment 60 signame 1 < expr 1 when condition else 61 expr2 62 selected signal assignment 63 with expression select 64 signame2 < x1 when choices 1 5 x2 when choices 66 67 xn when others d design flow Ewhdlstandar In21,Co167 NUM INS
- - while循环语句 -- conditional signal assignment -- selected signal assignment