8 Dec
2007
8 Dec
'07
10:30 a.m.
On Sat, Dec 08, 2007 at 08:12:30AM -0800, Peter C. Wallace wrote:
On Sat, 8 Dec 2007, Ethan Dicks wrote:
Right.
Has anyone here worked with or ever plotted
silently to create a moderish
7-segment decoder/driver from a GAL16V8?
IICRC the 16V8 does not have buried registers so you will lose the 4 of the
output pins (for the counter) that you needed for the 7 segment outputs If you are using sockets, a 5V or 3.3V (cheaper) 44
pin PLCC CPLD might be
a better solution, plus they are easier to program. A X9572XL will probably
do 4 decades of count/decode for about $2.00
That is not feasible. I need 7 or 9 decades of count/decode, and I happen
to have an abundance of GALs and a GAL programmer. If it comes down to a
CPLD-design, I'll probably throw in the towel and use an AVR microcontroller
and perhaps a real 74LS47 or 74LS247 to lower the I/O requirements a touch.
I was just musing about what it might take to put it all in hardware
rather than a combination of hardware and firmware. Using an MCU makes
the entire problem trivial.
Thanks,
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 8-Dec-2007 at 18:20 Z
South Pole Station
PSC 468 Box 400 Temp -25.2 F (-31.8 C) Windchill -52.6 F (-47.0 C)
APO AP 96598 Wind 14.0 kts Grid 20 Barometer 678.3 mb (10692 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html