概述

官方提供的原语

   RAM16X1S_1 #(.INIT(16'h0000) // Initial contents of RAM) RAM16X1S_1_inst (.O(O),       // RAM output.A0(A0),     // RAM address[0] input.A1(A1),     // RAM address[1] input.A2(A2),     // RAM address[2] input.A3(A3),     // RAM address[3] input.D(D),       // RAM data input.WCLK(WCLK), // Write clock input.WE(WE)      // Write enable input);RAM16X1D_1 #(.INIT(16'h0000) // Initial contents of RAM) RAM16X1D_1_inst (.DPO(DPO),     // Read-only 1-bit data output.SPO(SPO),     // Rw/ 1-bit data output.A0(A0),       // Rw/ address[0] input bit.A1(A1),       // Rw/ address[1] input bit.A2(A2),       // Rw/ address[2] input bit.A3(A3),       // Rw/ address[3] input bit.D(D),         // Write 1-bit data input.DPRA0(DPRA0), // Read-only address[0] input bit.DPRA1(DPRA1), // Read-only address[1] input bit.DPRA2(DPRA2), // Read-only address[2] input bit.DPRA3(DPRA3), // Read-only address[3] input bit.WCLK(WCLK),   // Write clock input.WE(WE)        // Write enable input);

内容

1. 单端分布式ram

2. 双端分布式ram

1. 单端分布式ram

verilog c代码

module primitive1(input clk,input write_enable,input [1-1:0] input_data,output [1-1:0] output_data,input [4-1:0] address);parameter RAM_WIDTH = 1;
parameter RAM_ADDR_BITS = 4;(* RAM_STYLE="{AUTO | DISTRIBUTED | PIPE_DISTRIBUTED}" *)
reg [RAM_WIDTH-1:0] dram [(2**RAM_ADDR_BITS)-1:0];always @(posedge clk)if (write_enable)dram[address] <= input_data; // 写数据assign output_data = dram[address];   //读数据
endmodule	

原语

module primitive1 (clk, write_enable, output_data, address, input_data
);input clk;input write_enable;output [0 : 0] output_data;input [3 : 0] address;input [0 : 0] input_data;wire address_0_IBUF_4;wire address_1_IBUF_5;wire address_2_IBUF_6;wire address_3_IBUF_7;wire clk_BUFGP_9;wire input_data_0_IBUF_11;wire output_data_0_OBUF_13;wire write_enable_IBUF_15;RAM16X1S   Mram_dram (.A0(address_0_IBUF_4),.A1(address_1_IBUF_5),.A2(address_2_IBUF_6),.A3(address_3_IBUF_7),.D(input_data_0_IBUF_11),.WCLK(clk_BUFGP_9),.WE(write_enable_IBUF_15),.O(output_data_0_OBUF_13));IBUF   write_enable_IBUF (.I(write_enable),.O(write_enable_IBUF_15));IBUF   address_3_IBUF (.I(address[3]),.O(address_3_IBUF_7));IBUF   address_2_IBUF (.I(address[2]),.O(address_2_IBUF_6));IBUF   address_1_IBUF (.I(address[1]),.O(address_1_IBUF_5));IBUF   address_0_IBUF (.I(address[0]),.O(address_0_IBUF_4));IBUF   input_data_0_IBUF (.I(input_data[0]),.O(input_data_0_IBUF_11));OBUF   output_data_0_OBUF (.I(output_data_0_OBUF_13),.O(output_data[0]));BUFGP   clk_BUFGP (.I(clk),.O(clk_BUFGP_9));
endmodule

RTL结构图

技术原理图

2. 双端分布式ram

verilog c代码

module primitive1(input clk,input write_enable,input [1-1:0] input_data,output [1-1:0] output_data,input [4-1:0] write_address,read_address);parameter RAM_WIDTH = 1;
parameter RAM_ADDR_BITS = 4;(* RAM_STYLE="{AUTO | DISTRIBUTED | PIPE_DISTRIBUTED}" *)
reg [RAM_WIDTH-1:0] ddram [(2**RAM_ADDR_BITS)-1:0];always @(posedge clk)if (write_enable)ddram[write_address] <= input_data;assign output_data = ddram[read_address];   endmodule

原语代码

module primitive1 (clk, write_enable, output_data, write_address, read_address, input_data
);input clk;input write_enable;output [0 : 0] output_data;input [3 : 0] write_address;input [3 : 0] read_address;input [0 : 0] input_data;wire clk_BUFGP_1;wire input_data_0_IBUF_3;wire output_data_0_OBUF_5;wire read_address_0_IBUF_10;wire read_address_1_IBUF_11;wire read_address_2_IBUF_12;wire read_address_3_IBUF_13;wire write_address_0_IBUF_18;wire write_address_1_IBUF_19;wire write_address_2_IBUF_20;wire write_address_3_IBUF_21;wire write_enable_IBUF_23;wire NLW_Mram_ddram_SPO_UNCONNECTED;RAM16X1D   Mram_ddram (.A0(write_address_0_IBUF_18),.A1(write_address_1_IBUF_19),.A2(write_address_2_IBUF_20),.A3(write_address_3_IBUF_21),.D(input_data_0_IBUF_3),.DPRA0(read_address_0_IBUF_10),.DPRA1(read_address_1_IBUF_11),.DPRA2(read_address_2_IBUF_12),.DPRA3(read_address_3_IBUF_13),.WCLK(clk_BUFGP_1),.WE(write_enable_IBUF_23),.SPO(NLW_Mram_ddram_SPO_UNCONNECTED),.DPO(output_data_0_OBUF_5));IBUF   write_enable_IBUF (.I(write_enable),.O(write_enable_IBUF_23));IBUF   write_address_3_IBUF (.I(write_address[3]),.O(write_address_3_IBUF_21));IBUF   write_address_2_IBUF (.I(write_address[2]),.O(write_address_2_IBUF_20));IBUF   write_address_1_IBUF (.I(write_address[1]),.O(write_address_1_IBUF_19));IBUF   write_address_0_IBUF (.I(write_address[0]),.O(write_address_0_IBUF_18));IBUF   read_address_3_IBUF (.I(read_address[3]),.O(read_address_3_IBUF_13));IBUF   read_address_2_IBUF (.I(read_address[2]),.O(read_address_2_IBUF_12));IBUF   read_address_1_IBUF (.I(read_address[1]),.O(read_address_1_IBUF_11));IBUF   read_address_0_IBUF (.I(read_address[0]),.O(read_address_0_IBUF_10));IBUF   input_data_0_IBUF (.I(input_data[0]),.O(input_data_0_IBUF_3));OBUF   output_data_0_OBUF (.I(output_data_0_OBUF_5),.O(output_data[0]));BUFGP   clk_BUFGP (.I(clk),.O(clk_BUFGP_1));
endmodule

RTL结构图

技术原理图

3. 总结

1. FPGA的LUT可以配置成分布式ram

2. 分布式ram的原语分为单端和双端