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Calling on logic equation gurus [message #846 is a reply to message #830] Fri, 24 June 2016 08:50 Go to previous messageGo to previous message
yoda is currently offline  yoda
Messages: 125
Registered: October 2015
Location: Cedar Rapids, IA
Senior Member
In the original Gryphon GALs - the one for coprocessor chip select was as follows:

GAL16V8
COPRO.1

CLK AS FC2 FC1 FC0 A19 A18 A17 A16 GND
A15 /CS /CLKD A14 A13 NC NC NC CPU VCC

CS = FC2 * FC1 * FC0
* /A19 * /A18 * A17 * /A16
* /A15 * /A14 * A13
* /CLK

+ FC2 * FC1 * FC0
* /A19 * /A18 * A17 * /A16
* /A15 * /A14 * A13
* /AS

+ FC2 * FC1 * FC0
* /A19 * /A18 * A17 * /A16
* /A15 * /A14 * A13
* /CLKD

CLKD = CLK


I coded this into verilog in Altera Quartus II and got a warning that CLK was not used as in input

I made CLKD a wire

Looking at the equations above is not CLK effectively being used in both states making it not relevant in the over all or'ing of the 3 statements?

Should I not have an equivalent by dropping 1st and 3rd terms?

Thanks

Dave
 
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