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Design Languages >> Verilog-AMS >> Multi-dimensional arrays in Verilog-AMS
https://designers-guide.org/forum/YaBB.pl?num=1273253854

Message started by mehregan on May 7^th, 2010, 10:37am

Title: Multi-dimensional arrays in Verilog-AMS
Post by mehregan on May 7^th, 2010, 10:37am

I would like to model a volumetric space by breaking it up into smaller volumes or mesh's and modeling each space using an R-C combination. I would like the number of mesh's to be set by the user as a parameter on the model and the values of Resistance/Capacitance in each mesh would need to vary from its adjacent neighbor. I know about the genvar function in AMS which would allow me to index a 1-dimensional array. I also know that Verilog 2001 supports multi-dimensional arrays. However there seems to be some limitations of using multi-dimensional arrays on analog nodes in AMS.

module saline1 (INOUT1, INOUT2 );
inout INOUT1, INOUT2
electrical INOUT1, INOUT2;

parameter integer slices = 3;

wire [0:slices] mesh [0:slices] [0:slices];

genvar i, j, k;

for (i=0; i<slices;i=i+1) begin
for (j=0; j<slices;j=j+1) begin
for (k=0; k<slices;k=k+1) begin
resistor #(.r(10)) R123 (mesh[i][j][k], mesh[i+1][j+1][k+1]);
end
end
end

......

endmodule

In this model however, AMS used the VHDL model for the resistor instead of the analog Spectre version. Not sure why. In my version of AMS simulator (AMS Designer) I cannot specify the net mesh as type "electrical". I had to use type "wire". This seems like a limitation of AMS? This also seems to preclude me from defining the resistor behaviorally within the analog begin - end as an equation: V() <+ I()/R;

I'm just curious if anyone has ever done any kind of multi-dimensional AMS where the multi-dimensional array is an analog electrical net.

- Rob