Im using verilog for a school assignment, and as a computer science
major, I probably wont be using it again for any more classes, since
this is the only electrical engineering class I need to take, so I find
that doing everything at the gate level makes sense. i've seen more
abstract methods to accomplish what I'm trying to do, but I'd like to
keep my coding style consistent throughout the project.
What im doing in this module is making a 9-bit 8-to-1 multiplexer by
putting 9 1-bit 8-to-1 multiplexers in parallel. I've tested my 1-bit
multiplexer, and it works as intended. my issue is with the 9bit, where
im moving bits from the input into the nested multiplexers. here is a
snippit of code
module mux_9b_81(
input [8:0] r0, r1, r2, r3, r4, r5, r6, r7,
input [2:0] s,
output [8:0] q);
mux81 b0(
.s(s),
.d[0](r0[0]), <-error
.d[1](r1[0]),
.d[2](r2[0]),
.d[3](r3[0]),
.d[4](r4[0]),
.d[5](r5[0]),
.d[6](r6[0]),
.d[7](r7[0]),
.q(q[0])
);
mux81 bn(
...
end module
to explain - mux0 selects the first bit from the selected(s) input, r0
mux1 selects the second bit from the selected(s) input, r1
...
all these bits are combined into q and returned.
I noted where xilinx shows that my error is,
and this error occurs in the same place in each mux81.
is this just a syntax error?
thanks,
-chris
Chris Phillips wrote: > > ... here is a > snippit of code Which is incomplete, as it doesn't include the port definition of your 1-bit multiplexer. > > module mux_9b_81( > input [8:0] r0, r1, r2, r3, r4, r5, r6, r7, > input [2:0] s, > output [8:0] q); > > mux81 b0( > .s(s), > .d[0](r0[0]), <-error Is your 1-bit mux defined like this?
1 | module mux_81( |
2 | input [7:0] d, |
3 | input [2:0] s, |
4 | output q); |
You can't pass single wires to a vector port definition, as the port is a single entity. You have tp pass a vector:
1 | mux81 b0( |
2 | .s(s), |
3 | .d( { r7[0]),
|
4 | r6[0]), |
5 | r5[0]), |
6 | r4[0]), |
7 | r3[0]), |
8 | r2[0]), |
9 | r1[0]), |
10 | r0[0] } ) , |
11 | .q(q[0]) |
12 | ); |
This is of course only waht my crystalball tells me.
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