24 Jul
2006
24 Jul
'06
4:31 p.m.
Holger Veit wrote:
woodelf schrieb:
The cost for two additional 74s182 (usable instead of
am2902) is not
very high,
but there is a price in glitches and reduced clock frequency involved
when propagating
a ripple carry over 5 units (=20bit). You won't find the ripple carry
effect unless you
feed the ALU with certain pathological patterns.
I am guessing 25 ns for ripple
carry per slice ... 125 ns delay.
24 bits would be a different story.
You might also find the Mick&Brick book worthwhile
for your enterprise.
I am guessing would be if I was using 'typical' computer archtecture that
favors register to register operations.
> using a 6809 style clock I hope to get about 1.5
Mhz with the system
> with a non-pipelined ROM.
This is using early 70's chips so a 1 MHZ memory
cycle is still fast.
Holger