Memory usage for the RAM port 2

Question

Hi,

I had a common question regarding the Megawizard ram port 2 memory usage. The device use was stratix II. When i create the Megawizard, i choose two read/write ports on the first page.

On the second page i choose 18 for read and write ports and 1024 for words of memory. and memory type block M9k.

The results in the memory usage shows 2 M9K which is correct as

18 x 1024 / 9216 = 2

how ever when i chooise for 2056 words it shows 5 M9k.

18 x 2056 / 9216 = 4

by comparing above, it shows a different memory usage. Do any one know what is the reason?

Any help would be very much appreciated.

thanks

best regards

kenny

altera_forum · Answer

The stratix 2 doesnt use M9ks. It has MRAMs, M4Ks and M512s

altera_forum · Answer

Sorry, it should be stratix III

altera_forum · Answer

(18 * 2 056) / 9 216 = 4.015625  try 2048 instead.

altera_forum · Answer

It is typo error, 2048 is the real value. If you try to used the megafunction, you will saw the resouce usage on that...   thanks

altera_forum · Answer

ah right.

to get a depth of 2048, the RAM is configured into 2048 x 4 mode. to make the bus x18, five x4 RAMs have to be used (2048 x 2 bits are unused). if four 512 x 18 blocks were used, external logic would have to be used to MUX between the 4 sets of x18 outputs.

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Memory usage for the RAM port 2

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