Danny Mok Altera HK FAE (dmok@altera.com) Tri-State vs MUX Danny Mok Altera HK FAE (dmok@altera.com) 4/23/2017 P.1

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 ? 4/23/2017 P.2

External Tri-State Buffer This Tri-State Buffer for I/O pad application 4/23/2017 P.3

What Altera Provide for .... All Altera Device will provide real Tri-State Buffer at the I/O pad 4/23/2017 P.4

Compilation Output 4/23/2017 P.5

Internal Tri-State Buffer Internal Tri-State Buffer Logic 4/23/2017 P.6

What Altera Provide.... Altera Max+Plus II will convert Internal Tri-State Buffer to MUX 4/23/2017 P.7

Can Altera support the following Design ?

Let us see ... Use see, Altera can not handle this design, but the other PLD vendor X.... can do it. Altera is not Good !!!!!!!!!! 4/23/2017 P.9

Look at the Circuit 4/23/2017 P.10

What the engineer wants ? X If there is an Internal Tri-State, what does the engineer expect for the Output ? The circuit itself is meaningless 4/23/2017 P.11

What is the application for Even though some PLD vendor can provide you the Internal Tri-State Buffer but what is the applicaton for ? 4/23/2017 P.12

Can Altera support this ? Before consider whether Altera support it or not ? First ask is this a meaningful circuit Yes, this is meaningful circuit Altera support all kind of meaningful circuit 4/23/2017 P.13

Compilation Output No doubt about it, Altera of course this because it is meaningful design 4/23/2017 P.14

Anything Wrong ??? This is my existing design and work perfectly OK, but now I want to use Altera device to implement it. Is that OK !?!?!? 4/23/2017 P.15

Try it .... Altera Problem ? or ??? 4/23/2017 P.16

Correct Approach WHY ? 4/23/2017 P.17

Closer Look Tri to MUX ???? 4/23/2017 P.18

Max+Plus II Compilation Result

Conclusion Altera provide complete solution for Tri-State Buffer Design Internal Tri-State Buffer Altera Max+Plus II will convert Internal Tri-State Buffer to MUX MUX solution provide more advantage then real Tri-State Buffer no signal contention smaller in die size -> low device cost External Tri-State Buffer All Altera Device I/O pad provide a real Tri-State Buffer 4/23/2017 P.20

A lot of Design need a real Tri-State Buffer at I/O almost all the PLD vendor provide this solution, of course ALTERA does Some PLD vendor emphasize support Internal Tri-State Buffer there is no meaningful application for this 4/23/2017 P.21