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Altera_Forum
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15 years ago

128 bit Avalon read/write

Hi, I am working on a class project that uses NIOS II to send 128 bit of data through Avalon bus to a custom logic to process and send back the data through Avalon to NIOS to display. I h...
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Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

As I mentioned before, another way to do it would be to assign a different address to each 32 bit word. For example, you could do something like: 


always @(posedge clk) begin
    if(avs_s0_write) begin
        case(avs_s0_address)
            2'd0: fifo_in   <= avs_s0_writedata;
            2'd1: fifo_in  <= avs_s0_writedata;
            2'd2: fifo_in  <= avs_s0_writedata;
            2'd3: fifo_in <= avs_s0_writedata;
        endcase
    end
end
Then, to write the 128 bits you would do something like: 


IOWR(ADD_INTERFACE_0_BASE,0,a);
IOWR(ADD_INTERFACE_0_BASE,1,b);
IOWR(ADD_INTERFACE_0_BASE,2,c);
IOWR(ADD_INTERFACE_0_BASE,3,d);