P2 (circa 2013) versus 1st working silicon

Interesting to compare where we are now versus 6 years ago...
Here's what I wrote on my website about P2 way back then (attached image).

We blew past the 2X clock speed, but at 2 clocks per instruction instead of 1. Guess this evens out.
Got way more RAM, 512 kB versus 128 kB.
256 longs of "stack" RAM became 512 longs of "LUT" RAM.
#pins reduced from 92 to 64, but now they are "smart", so maybe that's OK.
Think we have texture mapping and FXR, I don't remember what that is.
Think we lost explicit multi-tasking, but have interrupts, so maybe that's the same.
I also forgot what "quad-transfer" was, but now we have the streamer, which I think is better.
The QFP-100 package may be slightly easier to deal with that the 0.4 mm spaced QFP-128.



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Comments

  • The reason we don't have single-clock instructions, anymore, is because it would have taken three times the number of dual-port memories, going from 16 instances to 48. That would have taken tons of silicon, not to mention, power. For 180nm process technology, I think we have the right balance now.
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