PLS CAN XILINX S PRIMITIVE BUFGMUX BE CASCADED

OK. But two bufgmux cascades.

When an error is reported, follow the error prompt. XDC file can be synthesized again to eliminate the error:

set_property clock_dedicated_route false [get_nets u1_clocknet/clk_140m_150m]”

It should be noted that when the BUFG usage of the global cabling resource used for MUX is greater than 13%, the place-and-route will be greatly slower or even impossible to deploy.

I use bufgmux to drive the ADC, and speed can run. If you choose A7 logic with Verilog language as a multiplexer, that is, if you don't use primitives, the speed will not go up.

It should be possible, you write a ** to try. But is there any point in that?

This is dictated by Xilinx's primitives, which is not surprising and why not.

Define signed directly at the time of declaration, is it all in the book to see this method?。。 Personally, I feel that the problem may be due to the fact that your multiplication is 3, how to calculate the FPGA, if it is the power of 2, it also knows that it is just a shift, if not, what will it be synthesized into? The second is that the addition operation must be summed by the highest number of digits, and before that, there is a multiplication method to press how many digits you can check the book yourself.

Personally, I think that addition still uses $signed to do forced signed addition when assigning values. So your program can look like this:

wire [11:0] a,b;

wire [14:0] c;

wire [12:0] temp;

assign temp =

assign c = signed(a) +signed(b) +signed(temp);

Give it a try and tell me the results by the way.

As long as the name of the primitive is the same, it can be ported directly, and if the name is different, it can be modified, and it is generally universal.

The primitives of each device are different, so you need to go to the official website to find them.

The attachment is a primitive table for the Virtex6 chip.

What is an ICAP primitive? Why haven't I used this primitive? I haven't heard of it either.