HC210W datasheet(16/228 Pages) ALTERA

16 / 228 page

2–8

Altera Corporation

Preliminary

September 2008

HardCopy Series Handbook, Volume 1

Dynamic mode switching allows the designer to set up each Stratix II

DSP block to dynamically switch between the following three modes:

■

Up to four 18-bit independent multipliers

■

Up to two 8-bit multiplier-accumulators

■

One 36-bit multiplier

Each half of a Stratix II DSP block has separate mode control signals.

Since DSP block functions are implemented in HardCopy II devices using

HCells, HardCopy II devices do not support dynamic mode switching. If

this feature is used, the Quartus II software flags the DSP implementation

and does not allow you to migrate the design. The fitter reports that all

HardCopy II devices are not compatible with the design. To migrate your

Stratix II design to a HardCopy II companion device, disable dynamic

switching in the DSP blocks.

For more information on the Stratix II DSP operational modes, refer to

the Stratix II Device Handbook.

Embedded

Memory

HardCopy II memory blocks can implement various types of memory

with or without parity, including true dual-port, simple dual-port, and

single-port RAM, ROM, and FIFO buffers. HardCopy II devices support

the same memory functions and features as Stratix II FPGAs.

Functionally, the memory in both devices are identical. However, the

number of available memory blocks differs based on density (Table 2–3).

Since device functionality is fixed in HardCopy II devices, M4K block

contents cannot be preloaded or initialized with a MIF when they are

configured as RAM. When the M4K blocks are used as ROM, they will

initialize to the design’s ROM contents.

When using the non-registered outputs mode for the HardCopy II M4K

memory block, the outputs power up uninitialized. When using the

registered outputs mode for the HardCopy II M4K memory blocks, the

Table 2–3. HardCopy II Embedded Memory Resources

Feature

HC210W

HC210

HC220

HC230

HC240

M4K RAM blocks (4 Kbits)

190

408

614

768

M-RAM blocks (512 Kbits)

Total RAM bits (bits)

875,520

3,059,712

6,368,256

8,847,360

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