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dynamic memory size

med
Associate II

In the stm32mp157C-DK2 board, there is a DDR3 memory with size 4GB x 1.

I wanted to know why the size defined in the system is 512mb as the next figure show :

0693W000003PP7YQAW.png

0693W000003PP7iQAG.png

4 REPLIES 4
med
Associate II

NB: As far as the name "phoenix" is concerned, i juste renamed the board with that name (some kind of training on the uboot) :p

KnarfB
Principal III

Gb = giga bit

4 Gb = 0.5 GB (giga byte)

The notion GiB and MiB are more precisely expressing multiples of 1024 not 1000.

med
Associate II

Thanks, it's clear to me, but I think using the Byte is easier than using the bit ;)

KnarfB
Principal III

Thats right, at least from the software perspective. But its quite common to express the chip density in Mbit. And you read "256 Meg x 16" or "32 Meg x 16 x 8 banks" in the data sheet.