Altera Avalon Verification IP Suite - Manual (Page 171)

Description Component
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
Description Legal Values Default Value Option
Port Enables
When On, the interface includes a
byteenable
pin to enable specific byte lanes
during transfer.
On/Off On Use the byteenable signal
External Memory BFM Altera Corporation
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Using the External Memory BFM 13-2