On Tue, Jul 26, 2022 at 9:23 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > On Tue, Jul 26, 2022 at 8:55 AM Andy Shevchenko > <andy.shevchenko@xxxxxxxxx> wrote: > > On Tue, Jul 26, 2022 at 12:22 AM Linus Walleij <linus.walleij@xxxxxxxxxx> wrote: > > > > Well it will work, because all values come out, however *during* > > > the transfer, not *after* the transfer as intended with the > > > STR signal. > > > > No. I think you missed one little but crucial detail. The strobe is > > edge, not level, while you consider CS as a level signal (only). > > Aha! Then it works :) > > > See Figure 7 and Table 9 in the datasheet you linked to. When STR is > > low, the data is not changed. Maybe it's not clear in this datasheet, > > I found somewhere > > in a more clear table. > > > > > At least how I see it ...? > > > > If what you are saying is true, the hardware is totally broken and I > > wouldn't use it. I.o.w. if the strobe passes all data when it's at low > > level and latches at low-to-high, it's broken by definition in my > > point of view. > > I have seen strobes that are level-active in my life, but if you > say this one isn't then all is fine! It's rather my common sense, because we have a clock here to shift a register. It's kinda obvious *to me* that when we have a latch, that latch shouldn't pass data on a level. Yes, there are buffers with level strobe, but it's different. So, as I said, the oscilloscope can finish our discussion one way or the other, but I believe it will be my way ;) I will very (badly) surprised if it becomes your way. It will ruin my beliefs in humanity. Not less. -- With Best Regards, Andy Shevchenko
