Re: Simple gate array to replace 4 ls ttl + eprom

Chris Quayle schrieb:

Hi,

I have a low power pwm inverter designed back in 1996 which currently
uses 4 ls ttl for logic and the first couple of dozen bytes of a 2764
eprom to store 90 degree out of phase half sine tables. Inverter output
frequency is 400Hz.

I need to update this to provide 6 pwm outputs, antiphase pairs at 120
degree intervals. Sine table will have 6 steps per quadrant. I could
modify the existing design, but have been looking at fast micros and
gate array for the logic. A micro is not really fast enough, even in
assembler, so the question is, what is the lowest cost gate array or
similar that could replace all the above logic. Nothing fancy, minimum
cost for development kit, simple programming, and min cost in production
?...

Regards,

Chris

--
Greenfield Designs Ltd
-----------------------------------------------------------
Embedded Systems & Electronics: Research Design Development
Oxford. England. (44) 1865 750 681

depends on the definition of 'low power' and 'low cost'

choice 1: Lattice XP3, small flash PFGA with block rams inside
(6KByte), cost 8USD? (depends on qty)

if the power consumption is too much some quicklogic OTP fpgas could be
candidates.

in both cases the NRE costs are virtually 0 as you can use free
software tools and low cost eval boards. in case of quicklogic they
provide free 'webasic' samples I think, but you better get the design
work first time:)

Antti

.

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