DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 78

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

3–22
Stratix IV Device Handbook Volume 1
Power-Up Conditions and Memory Initialization
f
Figure 3–22
behavior for don’t care mode in M9K and M144K blocks.
Figure 3–22. M9K and M144K Blocks Mixed-Port Read-During Write: Don’t Care Mode
Mixed-port read-during-write is not supported when two different clocks are used in
a dual-port RAM. The output value is unknown during a dual-clock mixed-port
read-during-write operation.
M9K memory cells are initialized to all zeros through a default .mif file in the
Quartus II software. However, you may specify your own initialization of the
memory cells through a defined .mif file. M144K memory cells are not initialized and;
therefore, come up in an undefined state. This is to prevent the programming file from
being too large. Again, you may specify your own initialization of the memory cells
through a defined .mif file.
MLABs power up to zero if output registers are used and power up reading the
memory contents if output registers are not used. You must take this into
consideration when designing logic that might evaluate the initial power-up values of
the MLAB memory block. For Stratix IV devices, the Quartus II software initializes
the RAM cells to zero unless there is a .mif file specified.
As mentioned, all memory blocks support initialization using a .mif file. You can
create .mif files in the Quartus II software and specify their use with the RAM
MegaWizard Plug-In Manager when instantiating a memory in your design. Even if a
memory is pre-initialized (for example, using a .mif file), it still powers up with its
outputs cleared.
For more information about .mif files, refer to the
User Guide
q_b_(asyn)
address_a
address_b
clk_a&b
bytenna
data_a
wrena
rdenb
and the
shows a sample functional waveform of mixed-port read-during-write
Quartus II
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Handbook.
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Chapter 3: TriMatrix Embedded Memory Blocks in Stratix IV Devices
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Internal Memory (RAM and ROM)
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February 2011 Altera Corporation
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Design Considerations
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