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Hi there
I keep getting "Cannot connect part's output pin to gate's input pin" error on this particular line of code:
CHIP ALU {
IN
x[16], y[16], // 16-bit inputs
zx, // zero the x input?
nx, // first zero, then negate the x input?
zy, // zero the y input?
ny, // first zero, then negate the y input?
f, // compute out = x + y (if f == 1) or out = x & y (if == 0)
no; // negate the out output?
OUT
out[16], // 16-bit output
zr, // 1 if (out == 0), 0 otherwise
ng; // 1 if (out < 0), 0 otherwise
Parts:
ZxyNxy(a=x, b=y, zx=zx, nx=nx, zy=zy, ny=ny, outx=x_zxnx, outy=y_zyny);
....}
ZxyNxy.hdl uses the following in/out values: IN a[16], b[16], zx, nx, zy, ny; OUT outx[16], outy[16];
I hope that code is enough to troubleshoot! I can also attach ZxyNxy.hdl if it is required.
I don't really understand what the message is telling me! I've tried renaming the input variables of ZxyNxy so there are no repetitions of input/output/internal pin names but no luck!
Best wishes,
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Administrator
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ninmurai wrote
Hi there
I keep getting "Cannot connect part's output pin to gate's input pin" error on this particular line of code [in ALU.hdl]:
ZxyNxy(a=x, b=y, zx=zx, nx=nx, zy=zy, ny=ny, outx=x_zxnx, outy=y_zyny);
ZxyNxy.hdl uses the following in/out values: IN a[16], b[16], zx, nx, zy, ny; OUT outx[16], outy[16];
The Hardware Simulator is giving the wrong error message here. The problem is that "_" is not a legal character in a pin/wire name. Use a name like xZxnx instead of x_zxnx.
Bug detail:
The "_" is causing the parser to to split the pin name "x_zxnx" at the "_" so it sees
outx=x _zxnx
and processes that connection. Since "x" is an input to ALU, it generates the "can't connect input to output" message.
If you change the conenction to "outx=xx_zxnx", the simulator generates a ", or ) expected" message.
--Mark
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Awesome, Thanks Mark - ALU now fully working :D
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