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DescriptionComponent

Carries the shared address bus and data.

Tri-State Conduit Pin Sharer

Tri-State Conduit Inverse Pin Sharer

Controls the external memory BFM. The generic tri-state controller

accepts read and write requests. It converts these requests into necessary

SDRAM and bank management commands.

Generic Tri_State Controller

Related Information

Avalon Tri-State Conduit Components User Guide.

Using the External Memory BFM

At the beginning of the simulation, the external memory BFM loads the memory initialization file (INIT_FILE)

to initialize its memory content. For example, if the memory file has a memory size of 50, the BFM fills its

memory content with addresses 0–49. However, if you do not provide the memory initialization file, the

memory content of the BFM remains blank.

Reading to the Memory Content

You can read or write to the memory content through the APIs or the interface signals.

The BFM uses cdt_data_io as a bidirectional data port. During read transfers, this port acts as an output

port. It drives the corresponding address memory content when the BFM asserts or deasserts the following

signals:

• Asserts cdt_output_enable signal

• Asserts cdt_read signal

• Deasserts cdt_write signal

• Asserts cdt_chip_select signal

Otherwise, the cdt_data_io port acts as an inactive input port and is held in high impedance state.

Writing to the Memory

The BFM overwrites its memory content when the BFM asserts the following signals:

• cdt_write signal

• cdt_chip_select signal

Parameters

Table 13-2: External Memory BFM Parameter Settings

DescriptionLegal ValuesDefault ValueOption

Port Enables

When On, the interface includes a

byteenable pin to enable specific byte lanes

during transfer.

On/OffOnUse the byteenable signal

External Memory BFM

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Using the External Memory BFM

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