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maybe you define too many parameter for the scan chain, and some of them are exclusive. such as the scan chain length and scan chain counter. you only can define one of them.
if you define more than one test clock, when balance, you should care mix clock or not.
I have run the simulation with code, through the simulation result,
s[i] = a[i] ^ b[i] ^ c[i];
c[i+1] = (a[i]^M)(b[i]+c[i])+b[i]c[i];
should can get the correct result.
but arithmetic in the book, the result is not right.
Thanks you suggestion
Ring Oscillator
you don'nt need use start-up circuit.
At first, you will sure your oscillator loop is the positive feedback, and the gain of this loop >1(normally, it will > 2 each stage), and this oscillator will be OK.
Added after 2 minutes:
The circuit will balance at mid rail when in...
If you can dump the evcd file when simulation step use $dumpports in verilog, and you can read the evcd file into tmax, and tmax can report the function pattern coverage and you can write out in other format in tmax. For more detail, you can read the tmax manual.
Re: are there any command can translate c shell script into
If the c shell is for the Design Compiler or PT etc. tools, you can use dc-transcript <c shell file> <tcl file name>.
For the general c shell, I don't try it, maybe you can try it.
There are two equations for the adder or subtraction a book
s[i]=a[i]^(b[i]^M)^c[i];
c[i+1]=(a[i]+c[i])(b[i]^M)+a[i]c[i];
when M = 0, it is an adder a[i[+b[i]
when M = 1, it is a subtraction a[i]-b[i]
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I think when M = 1, d[i]=a[i]^b[i]^l[i], the b[i]...
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