HC230F1020 Altera, HC230F1020 Datasheet - Page 211

• Manufacturer Part Number: HC230F1020
• Manufacturer: Altera

Specifications of HC230F1020

• Lead Free Status / RoHS Status: Not Compliant

Altera Corporation
September 2008
Your HardCopy II design can use M4K memory blocks to implement
memory designs instead of M512 blocks. Quartus II megafunctions offer
various memory implementations that use M4K blocks. When using the
Quartus II MegaWizard
megafunction, Altera recommends selecting the Auto option to allow the
Quartus II software to determine how the design is implemented in the
memory blocks
optimize memory selection based on memory size and placement
requirements into the available memory blocks of the selected
HardCopy II and Stratix II companion pair.
Figure 8–2. Quartus II MegaFunction RAM selection
You can select logic cells in the megafunction to implement
small-memory blocks in your design. This implements the memory
design in Stratix II ALMs or HardCopy II HCells. However, there may be
power and performance trade-offs when choosing between an M4K or
M-RAM block or using the ALMs (or HCells). HardCopy II devices
power down unused M4K blocks, M-RAM blocks, and HCells.
1
For very small memory implementations such as a 8 × 16 single port
RAM, the M4K or M-RAM blocks will be under-utilized, and may be less
power efficient than a small number of HCells. If you select the logic cell
option, only a fraction of ALMs are required in the Stratix II device, which
translates into a small number HCells used in the HardCopy II device.
However, when performance is a key factor, or your design requires
ALMs to implement other logic, it may be more efficient to use M4K
blocks. Altera recommends using the Quartus II software to analyze
performance trade-offs between the given options.
Implementing memory blocks using logic cells, as seen in
Figure
functionally equivalent to M512 blocks or a non-equivalent
option to save resources. Altera recommends setting the option
to a functionally equivalent version with the M512 blocks.
(Figure
8–2, allows you to select a memory implementation
Stratix II and HardCopy II Companion Memory Blocks
®
8–2). This allows the Quartus II software to
Plug-In Manager to configure the
Preliminary
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