Had attempted to obtain address DRAM 524288

During the execution of my program LabVIEW FPGA in ModelSim 6.5 c using external memory FlexRIO PXI-7952R I get the following fatal error in my window of transcription ModelSim

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# * Note: running
# Duration: 2412750 ps iteration: 1 Instance: / tb_nifpgasimulationmodel/mainstimulusblock
# * Note: SendSettings
# Length: 4863 ns iteration: 1 Instance: / tb_nifpgasimulationmodel/mainstimulusblock
# * Note: running
# Duration: 7741500 ps iteration: 1 Instance: / tb_nifpgasimulationmodel/mainstimulusblock
# * Note: StartDMA_NOW
# Duration: 7741500 ps iteration: 1 Instance: / tb_nifpgasimulationmodel/mainstimulusblock
# * Note: running
# Duration: 11011500 ps iteration: 1 Instance: / tb_nifpgasimulationmodel/mainstimulusblock
# * Error:
# ===================================================
# Error has occurred
#
# Reason possible (s):
#
# LabVIEW FPGA: Was an error in the LabVIEW FPGA Module.
#
# Attempted to access DRAM address 524288
# For the simulation, the valid range of addresses of DRAM is 0 to 524287
# Limiting the address in one the following ways may fix the problem:
#
# Nested Clip - sharp: access only to addresses within the valid range.
# Nested Clip - FIFO: limit the total number of elements written to the PEPS of the maximum range.
# FPGA memory Articles: access only to addresses within the valid range and avoid access to the memory allocated to partitions beyond the maximum range.
# ===================================================
# Time: 11930 ns iteration: 1 Instance: / tb_nifpgasimulationmodel/nifpgasimulationmodel_instance/lvfpgasim795xtop_instance/lvfpgasim795xdrammainx/genbank0mig/drambank0controller
# * Error:
# ===================================================
# Error has occurred
#
# Reason possible (s):
#
# LabVIEW FPGA: Was an error in the LabVIEW FPGA Module.
#
# Attempted to access DRAM address 524288
# For the simulation, the valid range of addresses of DRAM is 0 to 524287
# Limiting the address in one the following ways may fix the problem:
#
# Nested Clip - sharp: access only to addresses within the valid range.
# Nested Clip - FIFO: limit the total number of elements written to the PEPS of the maximum range.
# FPGA memory Articles: access only to addresses within the valid range and avoid access to the memory allocated to partitions beyond the maximum range.
# ===================================================
# Duration: 11932500 ps iteration: 1 Instance: / tb_nifpgasimulationmodel/nifpgasimulationmodel_instance/lvfpgasim795xtop_instance/lvfpgasim795xdrammainx/genbank0mig/drambank0controller
# * Fatal: (vsim-3421) value 524289 is out of range of 0 to 524287.
# Duration: 11932500 ps iteration: 1 process: / tb_nifpgasimulationmodel/nifpgasimulationmodel_instance/lvfpgasim795xtop_instance/lvfpgasim795xdrammainx/genbank0mig/drambank0controller file: nofile
# Error fatal to a location protected by source
#
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In the first two lines, you can see the notes that my test bench is out.

When I start the FIFO DMA to 'STARTDMA_NOW' process the fifo beginning to buffer, and then my algorithm starts to fill the DDR RAM. This does not appear to be due to a problem to address. My published project will have several megabytes of different memory blocks in size. But for my test bench I ask for a few hundred bytes.

I use the external DRAM memory manager by default in the LabVIEW project, and the project has all the elements of memory shared equally in time granted round robin the resource manager in the LabVIEW project.

I managed to reduce my elements of DRAM to the smallest size that LabVIEW will let me. By doing this, I can now write at least two elements of memory before the ModelSim error.

It seems that LabVIEW is just launch the elements of memory anywhere that he wants in the memory card and it exceeds the capability of ModelSim to simulate accurately.

Since the elements of memory as small as possible (it is said actual number of items 131072), this won't ever smaller. I seem to be stuck.

I need to get LabVIEW to adjust the memory card while ModelSim can be read, or that I have to deal with ModelSim to read outside the range of addresses 524287.

(and in case anyone asks, I'm not address located outside this range. I have only a few items. I guess that the address to which I am interested in is only a pointer and more the beginning of my block of memory allocated that is created for me.)

Kind regards


Tags: NI Software

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