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ad_mem_asym: Add support for more ratios. 

Supported ratios: 1:1/1:2/1:4/1:8/2:1/4:1/8:1
main
Istvan Csomortani 2016-04-19 11:18:30 +03:00
parent 69d721526a
commit 42cd05ab19
1 changed files with 108 additions and 66 deletions
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70
library/common/ad_mem_asym.v
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@ -37,6 +37,9 @@
// ***************************************************************************
// ***************************************************************************
// A simple asymetric memory. The write and read memory space must have the same size.
// 2^A_ADDRESS_WIDTH * A_DATA_WIDTH == 2^B_ADDRESS_WIDTH * B_DATA_WIDTH
`timescale 1ns/100ps
module ad_mem_asym (
@ -50,15 +53,17 @@ module ad_mem_asym (
addrb,
doutb);
parameter A_ADDRESS_WIDTH = 10;
parameter A_ADDRESS_WIDTH = 8;
parameter A_DATA_WIDTH = 256;
parameter B_ADDRESS_WIDTH = 8;
parameter B_ADDRESS_WIDTH = 10;
parameter B_DATA_WIDTH = 64;
localparam MEM_SIZE_A = 2**A_ADDRESS_WIDTH;
localparam MEM_SIZE_B = 2**B_ADDRESS_WIDTH;
localparam MEM_SIZE = (MEM_SIZE_A > MEM_SIZE_B) ? MEM_SIZE_A : MEM_SIZE_B;
localparam MEM_RATIO = A_DATA_WIDTH/B_DATA_WIDTH;
localparam MEM_ADDRESS_WIDTH = (A_ADDRESS_WIDTH > B_ADDRESS_WIDTH) ? A_ADDRESS_WIDTH : B_ADDRESS_WIDTH;
localparam MEM_DATA_WIDTH = (A_DATA_WIDTH > B_DATA_WIDTH) ? B_DATA_WIDTH : A_DATA_WIDTH;
localparam MEM_SIZE = 2 ** MEM_ADDRESS_WIDTH;
// suported ratios: 1:1 / 1:2 / 1:4 / 1:8 / 2:1 / 4:1 / 8:1
localparam MEM_RATIO = (A_DATA_WIDTH > B_DATA_WIDTH) ? A_DATA_WIDTH/B_DATA_WIDTH : B_DATA_WIDTH/A_DATA_WIDTH;
localparam MEM_IO_COMP = (A_DATA_WIDTH > B_DATA_WIDTH) ? 1'b1 : 1'b0;
// write interface
@ -75,21 +80,21 @@ module ad_mem_asym (
// internal registers
reg [B_DATA_WIDTH-1:0] m_ram[0:MEM_SIZE-1];
reg [MEM_DATA_WIDTH-1:0] m_ram[0:MEM_SIZE-1];
reg [B_DATA_WIDTH-1:0] doutb;
// write interface
// write interface options
generate
if (MEM_RATIO == 1) begin
generate if (MEM_IO_COMP == 0) begin
always @(posedge clka) begin
if (wea == 1'b1) begin
m_ram[addra] <= dina;
end
end
end
endgenerate
if (MEM_RATIO == 2) begin
generate if ((MEM_IO_COMP == 1) && (MEM_RATIO == 2)) begin
always @(posedge clka) begin
if (wea == 1'b1) begin
m_ram[{addra, 1'd0}] <= dina[((1*B_DATA_WIDTH)-1):(B_DATA_WIDTH*0)];
@ -97,8 +102,9 @@ module ad_mem_asym (
end
end
end
endgenerate
if (MEM_RATIO == 4) begin
generate if ((MEM_IO_COMP == 1) && (MEM_RATIO == 4)) begin
always @(posedge clka) begin
if (wea == 1'b1) begin
m_ram[{addra, 2'd0}] <= dina[((1*B_DATA_WIDTH)-1):(B_DATA_WIDTH*0)];
@ -108,8 +114,9 @@ module ad_mem_asym (
end
end
end
endgenerate
if (MEM_RATIO == 8) begin
generate if ((MEM_IO_COMP == 1) && (MEM_RATIO == 8)) begin
always @(posedge clka) begin
if (wea == 1'b1) begin
m_ram[{addra, 3'd0}] <= dina[((1*B_DATA_WIDTH)-1):(B_DATA_WIDTH*0)];
@ -125,11 +132,46 @@ module ad_mem_asym (
end
endgenerate
// read interface
// read interface options
generate if ((MEM_IO_COMP == 1) || (MEM_RATIO == 1)) begin
always @(posedge clkb) begin
doutb <= m_ram[addrb];
end
end
endgenerate
generate if ((MEM_IO_COMP == 0) && (MEM_RATIO == 2)) begin
always @(posedge clkb) begin
doutb <= {m_ram[{addrb, 1'd1}],
m_ram[{addrb, 1'd0}]};
end
end
endgenerate
generate if ((MEM_IO_COMP == 0) && (MEM_RATIO == 4)) begin
always @(posedge clkb) begin
doutb <= {m_ram[{addrb, 2'd3}],
m_ram[{addrb, 2'd2}],
m_ram[{addrb, 2'd1}],
m_ram[{addrb, 2'd0}]};
end
end
endgenerate
generate if ((MEM_IO_COMP == 0) && (MEM_RATIO == 8)) begin
always @(posedge clkb) begin
doutb <= {m_ram[{addrb, 3'd7}],
m_ram[{addrb, 3'd6}],
m_ram[{addrb, 3'd5}],
m_ram[{addrb, 3'd4}],
m_ram[{addrb, 3'd3}],
m_ram[{addrb, 3'd2}],
m_ram[{addrb, 3'd1}],
m_ram[{addrb, 3'd0}]};
end
end
endgenerate
endmodule