《计算机英语》Tri-State Buffer

Tri-State ys MUX Danny Mok Altera HK FAE (amok@altera.com) Copyright 1997 Altera Corporation 2/22/2021P1 favara

Copyright © 1997 Altera Corporation 2/22/2021 P.1 Tri-State vs MUX Danny Mok Altera HK FAE (dmok@altera.com)

Tri-State Buffer a There are two application area for the Tri-State Buffer Internal Tri-State Buffer Logic need a Tri-State Buffer within device EXternal Tri-State Buffer Logic need a Tri-State Buffer at the O pin What Altera can provide Altera will implement Internal Tri-State Buffer with MUX All the lO pad can provide a real Tri-State Buffer But some other Pld vendor can provide Internal tri-State Buffer a is that any design limitation if use Altera Device? Copyright 1997 Altera Corporation 2/22/2021P2 favara

Copyright © 1997 Altera Corporation 2/22/2021 P.2 Tri-State Buffer ◼ There are two application area for the Tri-State Buffer – Internal Tri-State Buffer Logic • need a Tri-State Buffer within Device – External Tri-State Buffer Logic • need a Tri-State Buffer at the I/O pin ◼ What Altera can provide – Altera will implement Internal Tri-State Buffer with MUX – All the I/O pad can provide a real Tri-State Buffer ◼ But some other PLD vendor can provide – Internal Tri-State Buffer ◼ Is that any design limitation if use Altera Device ?

External tri-State Buffer in2 UTPUT DFFA out1 clk1 This Tri-State Buffer for 1/0 pad application Copyright 1997 Altera Corporation 2/22/2021P favara

Copyright © 1997 Altera Corporation 2/22/2021 P.3 External Tri-State Buffer This Tri-State Buffer for I/O pad application

What altera provide for ■■■■ All Altera Device will provide real Tri-State Buffer at the 1/O pad ntrols 尸0 grammable verso门 CLRN Slew-Rate Control VCC Copyright 1997 Altera Corporation 2/22/2021P4 favara

Copyright © 1997 Altera Corporation 2/22/2021 P.4 What Altera Provide for .... All Altera Device will provide real Tri-State Buffer at the I/O pad

Compilation Output 口枫 Go To Equations(1) Fan-Out间 t1:TFLC1_B1.⊥C1A Copyright 1997 Altera Corporation 2/22/2021P favara

Copyright © 1997 Altera Corporation 2/22/2021 P.5 Compilation Output

Internal tri-State Buffer ND2 m吕 Clk1 ouTpuT H out1 Copyright 1997 Altera Corporation Internal Tri-State Buffer Logic 2/22/2021P favara

Copyright © 1997 Altera Corporation 2/22/2021 P.6 Internal Tri-State Buffer Internal Tri-State Buffer Logic

What altera provide <Go To Equati。ns[之 LC1-B1 (16)=DFFC-E0002 GLOBAL( Clk1). vCCvCC) EQ002 C4B18 2#!n48 f lin3 Altera Max+Plus ii will convert Internal Tri-State Buffer to muX Copyright 1997 Altera Corporation 2/22/2021P7 favara

Copyright © 1997 Altera Corporation 2/22/2021 P.7 What Altera Provide.... Altera Max+Plus II will convert Internal Tri-State Buffer to MUX

Can Altera support the following design 2 CLRW out1 clk1 CLRN Copyright 1997 Altera Corporation 2/22/2021P favara

Copyright © 1997 Altera Corporation 2/22/2021 P.8 Can Altera support the following Design ?

Let us see∴ Compiler Compiler Database gIc Netlist Builder s synthesizer Partitioner Fitter Extractor 50 Start Sto Messages- Compiler Error: TRI or OPNDRN buffer 2 can only drive logic [ 16]if connected to a BIDIR pin Use see, Altera can not handle this design, but the other Pld vendor x.can do it. Altera is not good !!!!!!!!!! Copyright 1997 Altera Corporation 2/22/2021P favara

Copyright © 1997 Altera Corporation 2/22/2021 P.9 Let us see ... Use see, Altera can not handle this design, but the other PLD vendor X.... can do it. Altera is not Good !!!!!!!!!!

Look at the circuit 2 CLRW out1 clk1 Copyright 1997 Altera Corporation 2/22/2021P10 favara

Copyright © 1997 Altera Corporation 2/22/2021 P.10 Look at the Circuit