DRAM Chips

[!example]
16 words x 4-bit word chip (64 bits total)

Logical view

Drawing canvas

todo missing stuff

Logical view:

Drawing canvas

External view:

Drawing canvas

DRAM timing

Asynchronous DRAM

Handout: memTiming

Drawing canvas

Funny shape: multi-bit value

Fast Page Mode (FPM DRAM)

FPM: fast page mode, funny thing from the 90s that allows for faster read "ancient history for you, I was done my masters by then"

Memory controller gives the row number once, and then specifies various column numbers.

Synchronous RAM (SDRAM)

Double Date Rate SDRAM (DDR)

DRAM Performance

E.g assume: data size , bus clock , words read = 2