DMux8Way sel error

[seye]

Hi - great book!!

While working through project 1, I noticed that the test script for DMux8Way only has 2 bits for the output of the select field instead of 3. The .cmp file has the same 'error' (otherwise the test wouldn't pass)

Thanks

seye

[Anon]

Oh, the irony.

[Joel Healy]

Hi - I agree (great book!!)

I discovered the same error in January 2012 and found your post.  I guess there's not much activity on the site.  Oh, well.

Thanks

Joel

[Ruff]

Oh, and still, there is this output!
I'm wondering how this could happen, if everything is implemented as "BlackBox"?
the output on the "debugger" site is still correct.

[fabiog]

Yeah I had the same problem. I still wonder if that's not a trick the professors made so that you now know you can't rely on third party tests but should instead always follow you own test.
As a matter of fact, I did my own tests and the DMux8Way works as expected!

By the way, how did you tackle the Mux4Way16? I created first a Mux4Way and then repeat it for 16 times for the Mux4way16. I also made my own And4way rather than using 3 And all the time. Or am I implementing very bad??

All together I'm happy as just finished chapter 1, hurray!

[cadet1620]

Corrected DMux8Way.tst and DMux8Way.cmp are available from this post.

--Mark

[cadet1620]

fabiog wrote

By the way, how did you tackle the Mux4Way16? I created first a Mux4Way and then repeat it for 16 times for the Mux4way16. I also made my own And4way rather than using 3 And all the time. Or am I implementing very bad??

Search for Mux4Way16 in the forum and there are lots of hints on how to build it with a few Mux16s.

--Mark

[fabiog]

Thanks Mark, I figured it out how to do it with 3 Mux chips!