Design of Combinational Circuit Danny Mok Altera HK FAE (amok@altera.com) bBRA Copyright 1997 Altera Corporation 9/12/97
Copyright © 1997 Altera Corporation 9/12/97 Design of Combinational Circuit Danny Mok Altera HK FAE (dmok@altera.com)
What is combinational circuit Combinational circuit if Outputs at a specificed time are a function only of the INPUTS at that time example of combinational circuit address decoders ° multiplexers adders bBRA Copyright 1997 Altera Corporation 9/12/97
Copyright © 1997 Altera Corporation 9/12/97 What is Combinational Circuit ◼ Combinational Circuit if – Outputs at a specificed time are a function only of the INPUTS at that time – example of combinational circuit • address decoders • multiplexers • adders
Example There are three parts within this design LPM AVALUE LPM DIRECTIONEUP Which part is the Combinational Logic? MODULUS= LPMISVALUE - CLIQUE LPM IDTH=3 PM COUNTE 'PROBE1 Preset counter value Is 7 >out ABRA Copyright 1997 Altera Corporation 9/12/97
Copyright © 1997 Altera Corporation 9/12/97 Example There are three parts within this design Which part is the Combinational Logic ? Preset when counter value is H”7
Simulation result What is the Expect Output U DFECT MF UF 顺UU D reset IPM COUNTER clk 「「「L「L「 clk2 q2.0 001001 000X X34X5670 X What do you get 100.0ns -reset 0 aqg叫010x1X2-345X670X1 Copyright 1997 Altera Corporation 9/12/97 Error
Copyright © 1997 Altera Corporation 9/12/97 Simulation Result What is the Expect Output What do you get Error
Altera Device has problem I can not use it anymore I never use it again No no no It is not altera How Device problem OK!I can prove it to you bBRA Copyright 1997 Altera Corporation 9/12/97
Copyright © 1997 Altera Corporation 9/12/97 Altera Device has problem I can not use it anymore I never use it again No, no, no.... It is not Altera Device problem OK ! I can prove it to you How ?