本帖最后由 xiantingfeng 于 2014-3-7 22:17 编辑
Xilinx的ddr2 控制器出问题了，自己写的读写程序，很奇怪，读写256M的内存条，64位宽，突发长度为8。
设起始写地址为1，存连续的整数，如果读地址为1的话，读写的数据一样。
如果读地址为2，出现后面这种情况，2,3,1,4,6,7,8,5 。
如果起始地址为3，读的数据为3,4,1,2,7,8,5,6 。
是不是读写程序出问题了，求解。
N取32，burst_cnt，burst_cnt2 是存储的计数，wr_state是写数据的状态机，write_flag是(app_wdf_afull == 1) || (app_af_afull == 1)后中止写的标志位。写这些数据的时候，write_flag一直有效。
求解！
部分程序如下：
if (burst_cnt2 < N+1) begin
if (burst_cnt < N+1) begin
if (write_flag == 1) begin
if ((ram3_cnt != N+1) && (ram3_cnt != N+2)) begin
ram3_cnt <= ram3_cnt + 2;
app_af_cmd <= 3'b000; app_wdf_wren <= 1;
wr_data_rise <= ram3_cnt + j_mti_N; wr_data_fall <= ram3_cnt+1 + j_mti_N;
case(wr_state)
1: begin app_af_wren <= 1; wr_state <= 2;
if (burst_cnt == 1)
app_af_addr <= 5242880 +1+{burst_cnt2,10'b0}-1024;
else app_af_addr <= app_af_addr + 8; end
2: begin app_af_wren <= 0; wr_state <= 3; end
3: wr_state <= 4;
4: begin wr_state <= 1; burst_cnt <= burst_cnt + 8;
if ((app_wdf_afull == 1) || (app_af_afull == 1)) begin
write_flag <= 0; // app_wdf_wren <= 0; app_af_wren <= 0;
end end
endcase
end
end
else begin
app_wdf_wren <= 0; app_af_wren <= 0;
if ((app_wdf_afull == 0) && (app_af_afull == 0)) begin
write_flag <= 1; wr_state <= 1; //wr_state <= state1;
end
end
end
else begin
app_wdf_wren <= 0; app_af_wren <= 0;
burst_cnt2 <= burst_cnt2 + 1;
j_mti_N <= j_mti_N + 1024;//100;
burst_cnt <= 1; ram3_cnt <= 1;
end
end
else begin
if (app_af_afull==0) begin
if (burst_cnt3 < N+1)
if (burst_cnt3 == 1)
app_af_addr <= 5242880 +1;
else
app_af_addr <= app_af_addr + 8;
app_af_cmd <= 3'b001; app_af_wren <= 1;
burst_cnt3 <= burst_cnt3 + 8;
end
end
end
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