MIG MCB 意外写入行为答案

【问题标题】：MIG MCB Unexpected Write BehaviorMIG MCB 意外写入行为
【发布时间】：2018-09-17 16:45:25
【问题描述】：

所以我最近继承了一个在设计中实现了生成的 MCB 的项目。我以前从未调试过 IP 内核，所以您必须原谅我，我的问题的解决方案是显而易见的。我已经解决这个问题一两天了，但似乎无法弄清楚。

首先，我已经阅读了几遍文档 UG388、UG406、UG416，并做了一些研究，但没有运气。

据我了解，MCB 是在配置 1 中设置的：

    localparam C3_PORT_ENABLE             = 6'b111111;
    localparam C3_PORT_CONFIG             =  "B32_B32_R32_R32_R32_R32";
    localparam C3_P0_PORT_MODE             =  "BI_MODE";
    localparam C3_P1_PORT_MODE             =  "BI_MODE";
    localparam C3_P2_PORT_MODE             =  "RD_MODE";
    localparam C3_P3_PORT_MODE             =  "RD_MODE";
    localparam C3_P4_PORT_MODE             =  "RD_MODE";
    localparam C3_P5_PORT_MODE             =  "RD_MODE";

并设置为与 DDR2 内存接口。我不确定还有哪些其他信息对这个问题很重要，但如果您需要，我可以发布更多信息。以下是一些我认为会有所帮助的附加参数：

localparam C3_NUM_DQ_PINS          = 16;
localparam C3_MEM_ADDR_WIDTH       = 13;
localparam C3_MEM_BANKADDR_WIDTH   = 3;
localparam C3_MEM_ADDR_ORDER       = "ROW_BANK_COLUMN";
localparam C3_P0_MASK_SIZE          = 4;
localparam C3_P0_DATA_PORT_SIZE     = 32;

另外，我应该提到该设计仅使用一个端口 (p0)。就行为而言，生成的 MCB 带有一个包含 TB 的 Example_design，我已经成功运行，没有任何错误。

现在我正在尝试设置我自己的 tb 来执行简单的写入和读取。我能够写入 32 位并读取相同的 32 位，但问题是内存单元每次都按 4 - 16 位值的顺序读取。这意味着它写入的数据中有一半是“XXXX”，并且无法弄清楚如何用有意义的数据填充该空间。这是我的输出（最后几行显示了问题，第一部分只是可能有用的初始化内容）：

ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 438401.0 ps WARNING: 200 us is required before CKE goes active.
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 460801.0 ps INFO: Precharge All
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 486401.0 ps INFO: Load Mode 2
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 486401.0 ps INFO: Load Mode 2 High Temperature Self Refresh rate = 1X (0C-85C)
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 499201.0 ps INFO: Load Mode 3
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 DLL Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 Output Drive Strength = Full
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 ODT Rtt = 50 Ohm
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 Additive Latency =           0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 OCD Program = OCD Exit
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 DQS_N Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 RDQS Enable = Disabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 512001.0 ps INFO: Load Mode 1 Output Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 Burst Length =  4
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 Burst Order = Sequential
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 CAS Latency =           5
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 Test Mode = Normal
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 DLL Reset = Reset DLL
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 Write Recovery =           5
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 524801.0 ps INFO: Load Mode 0 Power Down Mode = Fast Exit
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 537601.0 ps INFO: Precharge All
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 563201.0 ps INFO: Refresh  
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 691201.0 ps INFO: Refresh  
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 Burst Length =  4
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 Burst Order = Sequential
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 CAS Latency =           5
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 Test Mode = Normal
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 DLL Reset = Normal
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 Write Recovery =           5
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 819201.0 ps INFO: Load Mode 0 Power Down Mode = Fast Exit
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 DLL Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 Output Drive Strength = Full
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 ODT Rtt = 50 Ohm
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 Additive Latency =           0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 OCD Program = OCD Default
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 DQS_N Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 RDQS Enable = Disabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 832001.0 ps INFO: Load Mode 1 Output Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 DLL Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 Output Drive Strength = Full
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 ODT Rtt = 50 Ohm
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 Additive Latency =           0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 OCD Program = OCD Exit
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 DQS_N Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 RDQS Enable = Disabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Load Mode 1 Output Enable = Enabled
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 844801.0 ps INFO: Initialization Sequence is complete
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 864001.0 ps INFO: Precharge All
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 1382401.0 ps INFO: Activate  bank 0 row 0000
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .cmd_task: at time 1395201.0 ps INFO: Write     bank 0 col 080, auto precharge 0
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .main: at time 1401601.0 ps INFO: Sync On Die Termination = 1
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .data_task: at time 1409601.0 ps INFO: WRITE @ DQS= bank = 0 row = 0000 col = 00000080 data = 5678
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .data_task: at time 1411201.0 ps INFO: WRITE @ DQS= bank = 0 row = 0000 col = 00000081 data = 1234
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .data_task: at time 1412801.0 ps INFO: WRITE @ DQS= bank = 0 row = 0000 col = 00000082 data = xxxx
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .data_task: at time 1414401.0 ps INFO: WRITE @ DQS= bank = 0 row = 0000 col = 00000083 data = xxxx
ReadWrite_MIG_tb.\MEM_INST3.u_mem_c3 .main: at time 1422401.0 ps INFO: Sync On Die Termination = 0

在将 p0_cmd 放入 cmd FIFO 时，p0_wr_count 为 3（我在其中填充了一些额外的值，以防出现问题）。 example_design tb 也执行 4 次连续写入，但它们不是“XXXX”。

我一直在将我的波形与 tb 和 UG388 进行比较，看起来我确实正确地复制了它，但不确定是什么导致了这种行为。如何用数据填充“XXXX”或阻止它写入额外的值？

任何帮助将不胜感激！

【问题讨论】：

标签： verilog fpga xilinx spartan

【解决方案1】：

似乎几天后重新启动我的计算机，问题似乎已经解决了。我不记得做过任何重大更改，现在无法复制我之前描述的行为。

目前，我可以认为此问题已解决，但如果我发现任何新内容，我会更新此问题。我认为这将是微不足道的事情，但这就是无法解释的。

【讨论】：