19 Feb
2017
19 Feb
'17
3:13 a.m.
On 17.02.2017 17:55, Jon Elson wrote:
On 02/17/2017 10:01 AM, Philipp Hachtmann wrote:
It seems that Xilinx has made some hints that they do NOT plan to retire
the XC95xxXL series any time soon.
:-)
The CPLD
you had on the last board, XC9572XL is a bit long in the tooth,
perhaps? Would you expect to use that one again, or a newer chip?
I will use it
again. It was already old when I decided to use it. It
has 5V tolerant inputs.
If they do, the CoolRunner II family can be used with
the addition of
one more voltage regulator.
By the way my handmade prototype with three CPLDs (I
ordered the wrong
pincount) had CoolRunner II.
I then switched to the old one because the IO voltage compatibility.
I was unsure if I could connect TTL IN(!!!)-puts to the pins without
degrading the chip too much: TTL inputs go up to 5V when they are left
floating. I was simply not sure if the CoolRunner pins are properly
protected against that. So I chose the safe option.