verilog/dv/caravel/user_proj_example/DFFRAM_beh.v

module DFFRAM_beh #( parameter COLS=1)
(
`ifdef USE_POWER_PINS
     VPWR,
     VGND,
`endif
    CLK,
    WE,
    EN,
    Di,
    Do,
    A
);

`ifdef USE_POWER_PINS
     input VPWR;
     input VGND;
`endif

    localparam A_WIDTH = 8+$clog2(COLS);

    input   wire            CLK;
    input   wire    [3:0]   WE;
    input   wire            EN;
    input   wire    [31:0]  Di;
    output  reg     [31:0]  Do;
    input   wire    [(A_WIDTH - 1): 0]   A;

    reg [31:0] RAM[(256*COLS)-1 : 0];
    
    always @(posedge CLK) 
        if(EN) begin
            Do <= RAM[A];
            if(WE[0]) RAM[A][ 7: 0] <= Di[7:0];
            if(WE[1]) RAM[A][15:8] <= Di[15:8];
            if(WE[2]) RAM[A][23:16] <= Di[23:16];
            if(WE[3]) RAM[A][31:24] <= Di[31:24];
        end 
        else
            Do <= 32'b0;
            
endmodule