RE: on-chip memory
Jeff Fox writes:
> So adding about 100 words of memory would double the size of F21. That
> might not sound expensive to industrial budgets. To me that sounds
> expensive. It is just a matter of perspective. Now I realize there is
> enough white space to fit 100 words on the current die size without
> a problem but the suggestion was made for hundreds or thousands of times
> that much memory on chip.
Jeff, the whole point of using modern embedded RAM processes is to go
to very wide bus widths, with resulting orders of magnitude bandwidth
increase. 512 bits, kBit, and beyond. Embedded RAM is a true DRAM
process, which allows you to combine essentially DRAM density with CPU
structures; also, DRAM cells are quite fast during on-die
accesses. While there is no point in adding instruction slots beyond a
certain limit, one can process things in a SIMD style.
As to grain size, code is one thing, data another. It would be very
nice to have at least 1 MBit memory grains, and no off-chip memory.
