*****************************************************************************/
//把Ram寄存器的16bytes数据写入ddr中
always @(posedge c3_clk0)
begin
if(c3_rst0 || !c3_calib_done)
begin
c3_p0_wr_en<=1'b0;
c3_p0_wr_mask<=16'd0;
c3_p0_wr_data<=128'd0;
ddr_write_busy <=1'b0;
c3_p0_cmd_en_w<=1'b0;
c3_p0_cmd_instr_w<=3'd0;
c3_p0_cmd_bl_w<=6'd0;
c3_p0_cmd_byte_addr_w<=30'd0;
ddr_write_state<=write_idle;
end
else
begin
case(ddr_write_state)
write_idle:begin
c3_p0_wr_en<=1'b0;
c3_p0_wr_mask<=16'd0;
if(ddr_wr_req) //如果写DDR请求
begin
ddr_write_busy<=1'b1; //ddr写数据忙标志
ddr_write_state<=write_fifo;
c3_p0_wr_data<=ddr_wdata_reg; //准备写入DDR的数据
end
end
write_fifo:begin
if(!c3_p0_wr_full) //如p0写fifo数据不满
begin
c3_p0_wr_en<=1'b1;
ddr_write_state<=write_data_done;
end
end
write_data_done:begin
c3_p0_wr_en<=1'b0;
ddr_write_state<=write_cmd_start;
end
write_cmd_start:begin
c3_p0_cmd_en_w<=1'b0;
c3_p0_cmd_instr_w<=3'b010; //010为写命令
c3_p0_cmd_bl_w<=6'd0; //burst length为1个128bit数据
c3_p0_cmd_byte_addr_w<=c3_p0_cmd_byte_addr_w+16; //地址加16
ddr_write_state<=write_cmd;
end
write_cmd:begin
if (!c3_p0_cmd_full) //如果命令FIFO不满
begin
c3_p0_cmd_en_w<=1'b1; //写命令使能
ddr_write_state<=write_done;
end
end
write_done:begin
c3_p0_cmd_en_w<=1'b0;
ddr_write_state<=write_idle;
ddr_write_busy<=1'b0;
end
default:begin
c3_p0_wr_en<=1'b0;
c3_p0_cmd_en_w<=1'b0;
c3_p0_cmd_instr_w<=3'd0;
c3_p0_cmd_bl_w<=6'd0;
ddr_write_state<=write_idle;
end
endcase;
end
end
/*****-----------------------------------------------------------------------------------*/
/*****************************************************************************/
//DDR数据读处理程序
always @(posedge c3_clk0)
begin
if(c3_rst0 || !c3_calib_done)
begin
c3_p0_rd_en<=1'b0;
ddr_rd_busy <=1'b0;
c3_p0_cmd_en_r<=1'b0;
c3_p0_cmd_instr_r<=3'd0;
c3_p0_cmd_bl_r<=6'd0;
c3_p0_cmd_byte_addr_r<=30'd16;
ddr_read_state<=read_idle;
ddr_data<=128'd0;
end
else
begin
if(ddr_addr_set)
c3_p0_cmd_byte_addr_r<=30'd16; //ddr的地址置位
else if(pic_store_done)
begin
case(ddr_read_state)
read_idle:begin
if(ddr_rden_req) //如果有ddr读请求
begin
ddr_read_state<=read_cmd_start;
ddr_rd_busy <=1'b1;
end
end
read_cmd_start:begin
c3_p0_cmd_en_r<=1'b0;
c3_p0_cmd_instr_r<=3'b001; //命令字为读
c3_p0_cmd_bl_r<=6'd0; //single read
ddr_read_state<=read_cmd;
end
read_cmd:begin
c3_p0_cmd_en_r<=1'b1; //ddr读命令使能
ddr_read_state<=read_wait;
end
read_wait:begin
c3_p0_cmd_en_r<=1'b0;
if(!c3_p0_rd_empty) //如果read fifo不空
ddr_read_state<=read_data;
end
read_data:begin
c3_p0_rd_en<=1'b1; //读数据使能
ddr_read_state<=read_done;
ddr_data<=c3_p0_rd_data;
end
read_done:begin
c3_p0_rd_en<=1'b0;
ddr_rd_busy <=1'b0;
c3_p0_cmd_byte_addr_r<=c3_p0_cmd_byte_addr_r+16; //ddr的地址加16
ddr_read_state<=read_idle;
end
default:begin
c3_p0_rd_en<=1'b0;
c3_p0_cmd_en_r<=1'b0;
ddr_read_state<=read_idle;
end
endcase;
end
end
end
/***----------------------------------------------------------------------------------------*/
代码如上，就是单个读写。现在的问题是，我单个单个的连续写不同的地址（地址间隔16），写入的数据，通过读出验证是完全正确的！但验证方式是只读一个地址，分几次更换地址重新烧录来验证。如果我一次单个单个的读几个地址来验证的话，就出现，后面读取的地址数据一直是就开始读取的那个地址的数据。比如：我首先向地址0，16，32，48写如1，2，3，4；如过我只读一个地址（0 or 16 or 32 or 48），读出的数据和我写入的一致，但如果我单个单个连续读0，16，32，48，则读出的数据则是1，1，1，1，假如我单个单个连续读32，16，48，则读出的数据则是3，3，3。这个问题是什么问题？希望大家指点！
/1 
eetop公众号
创芯大讲堂
创芯人才网
发表于 2014-6-7 15:08:48
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