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Improved vivado "system" example

This commit is contained in:
Clifford Wolf 2015-07-12 22:59:21 +02:00
parent 94edf3565d
commit 0249d538fa
2 changed files with 56 additions and 16 deletions
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68
scripts/vivado/system.v
View File

@ -7,12 +7,15 @@ module system (
output reg [7:0] out_byte,
output reg out_byte_en
);
// set this to 0 for better timing but less performance/MHz
parameter FAST_MEMORY = 1;
// 4096 32bit words = 16kB memory
parameter MEM_SIZE = 4096;
wire mem_valid;
wire mem_instr;
wire mem_ready;
reg mem_ready;
wire [31:0] mem_addr;
wire [31:0] mem_wdata;
wire [3:0] mem_wstrb;
@ -24,7 +27,7 @@ module system (
wire [31:0] mem_la_wdata;
wire [3:0] mem_la_wstrb;
picorv32 uut (
picorv32 picorv32_core (
.clk (clk ),
.resetn (resetn ),
.trap (trap ),
@ -45,21 +48,54 @@ module system (
reg [31:0] memory [0:MEM_SIZE-1];
initial $readmemh("firmware.hex", memory);
assign mem_ready = 1;
reg [31:0] m_read_data;
reg m_read_en;
always @(posedge clk) begin
out_byte_en <= 0;
mem_rdata <= memory[mem_la_addr >> 2];
if (mem_la_write && (mem_la_addr >> 2) < MEM_SIZE) begin
if (mem_la_wstrb[0]) memory[mem_la_addr >> 2][ 7: 0] <= mem_la_wdata[ 7: 0];
if (mem_la_wstrb[1]) memory[mem_la_addr >> 2][15: 8] <= mem_la_wdata[15: 8];
if (mem_la_wstrb[2]) memory[mem_la_addr >> 2][23:16] <= mem_la_wdata[23:16];
if (mem_la_wstrb[3]) memory[mem_la_addr >> 2][31:24] <= mem_la_wdata[31:24];
generate if (FAST_MEMORY) begin
always @(posedge clk) begin
mem_ready <= 1;
out_byte_en <= 0;
mem_rdata <= memory[mem_la_addr >> 2];
if (mem_la_write && (mem_la_addr >> 2) < MEM_SIZE) begin
if (mem_la_wstrb[0]) memory[mem_la_addr >> 2][ 7: 0] <= mem_la_wdata[ 7: 0];
if (mem_la_wstrb[1]) memory[mem_la_addr >> 2][15: 8] <= mem_la_wdata[15: 8];
if (mem_la_wstrb[2]) memory[mem_la_addr >> 2][23:16] <= mem_la_wdata[23:16];
if (mem_la_wstrb[3]) memory[mem_la_addr >> 2][31:24] <= mem_la_wdata[31:24];
end
else
if (mem_la_write && mem_la_addr == 32'h1000_0000) begin
out_byte_en <= 1;
out_byte <= mem_la_wdata;
end
end
else
if (mem_la_write && mem_la_addr == 32'h1000_0000) begin
out_byte_en <= 1;
out_byte <= mem_la_wdata;
end else begin
always @(posedge clk) begin
m_read_en <= 0;
mem_ready <= mem_valid && !mem_ready && m_read_en;
m_read_data <= memory[mem_addr >> 2];
mem_rdata <= m_read_data;
out_byte_en <= 0;
(* parallel_case *)
case (1)
mem_valid && !mem_ready && !mem_wstrb && (mem_addr >> 2) < MEM_SIZE: begin
m_read_en <= 1;
end
mem_valid && !mem_ready && |mem_wstrb && (mem_addr >> 2) < MEM_SIZE: begin
if (mem_wstrb[0]) memory[mem_addr >> 2][ 7: 0] <= mem_wdata[ 7: 0];
if (mem_wstrb[1]) memory[mem_addr >> 2][15: 8] <= mem_wdata[15: 8];
if (mem_wstrb[2]) memory[mem_addr >> 2][23:16] <= mem_wdata[23:16];
if (mem_wstrb[3]) memory[mem_addr >> 2][31:24] <= mem_wdata[31:24];
mem_ready <= 1;
end
mem_valid && !mem_ready && |mem_wstrb && mem_addr == 32'h1000_0000: begin
out_byte_en <= 1;
out_byte <= mem_wdata;
mem_ready <= 1;
end
endcase
end
end
end endgenerate
endmodule

4
scripts/vivado/system_tb.v
View File

@ -6,6 +6,10 @@ module system_tb;
reg resetn = 0;
initial begin
if ($test$plusargs("vcd")) begin
$dumpfile("system.vcd");
$dumpvars(0, system_tb);
end
repeat (100) @(posedge clk);
resetn <= 1;
end