4 ms·
You still have to then AND the output of that decoder with the data lines which go to the registers right? OP's friend just mentioned 1 extra gate in the data p
by anjc 10y ago
You still have to then AND the output of that decoder with the data lines which go to the registers right? OP's friend just mentioned 1 extra gate in the data path, and I presume this would be it.
- morcheeba 10y agoYep, but a 7-input AND gate will have basically the same delay time as an 8-input AND gate. They don't scale linearly as it would if you stacked 6 or 7 gates in series (although that's typically how you do it in math or programming) I like examples: 74AHC00 2-input gate has typ 4.5ns propagation delay at 25˚C/15pF/3-3.6v http://www.nxp.com/documents/data_sheet/74AHC_AHCT00.pdf http://www.nxp.com/documents/data_sheet/74AHC_AHCT00.pdf 74AHC30 8-input gate has typ 5.0ns propagation delay at 25˚C/15pF/3-3.6v http://www.nxp.com/documents/data_sheet/74AHC_AHCT30.pdf http://www.nxp.com/documents/data_sheet/74AHC_AHCT30.pdf
- anjc 10y agoOh of course yeah. I was picturing it as a separate AND when it could be bunged in with the ANDs for individual register selects and write/load enables and so on also. Cool, thanks.