HC210 datasheet(212/228 Pages) ALTERA

212 / 228 page

8–24

Altera Corporation

September 2008

HardCopy Series Handbook, Volume 1

M4K Utilization

HardCopy II M4K block functionality is similar to Stratix II M4K blocks.

You cannot pre-load HardCopy II M4K blocks with a memory

initialization file (.mif) when used as RAM. Also, unlike Stratix II devices,

the HardCopy II M4K RAM contents and their output registers are

unknown after power up. However, if the HardCopy II M4K block is

designated as ROM, it powers up with the ROM contents. When

designing M4K blocks as RAM, Altera recommends writing to the block

before reading from it to avoid reading unknown initial power-up data

conditions. One advantage over Stratix II RAM blocks is unused M4K

blocks are disconnected from the power rails, optimizing overall power

consumption.

M-RAM Compatibility

HardCopy II M-RAM blocks share the same functionality as Stratix II

M-RAM blocks. One key feature with HardCopy II M-RAM blocks is

power optimization when the M-RAM block is not used. Unused M-RAM

blocks are disconnected from the power rails, optimizing overall power

consumption.

Some Stratix II devices (engineering sample devices and

Revision A production devices) have M-RAM functionality that

differs slightly from current Stratix II production devices.

HardCopy II M-RAM functionality only matches that of current

Stratix II devices. Hence, in order to maintain proper

compatibility, compiling only for current production Stratix II

devices is supported. More information on the Stratix II M-RAM

errata can be found in the Stratix II FPGA Family Errata Sheet

available on the Altera website (www.altera.com).

HC210 Datasheet(PDF) 212 Page - Altera Corporation