chips - test-drb@ccmp.vtda.org

28 Jun 1999

On Jun 28, 17:41, Richard Erlacher wrote:
...
  Subject: Re: chips
 SInce these are electrically eraseable it's of no consequence what the
 previous program was.  These parts can be viewed as a relplacement for the
...
  entire 16xN series where x=L or R and N ranges from 4
to 8.  They can
 effectively emulate/replace 16L8, 16R4, 16R6 and 16R8 with a few exceptions.
...
  The macrocells associated with pins 19 and 12 have no
feedback path of their
...
  own, i.e. it must be via the adjacent macrocell.  The
data book (these are
...
  AMD/Vantis parts) for the Lattice GAL parts will
explain it adequately if
 you can't lay hands on an AMD databook. 
They're not necessarily AMD; they could be Cypress parts, or one of a few
other manufacturers.  Unfortunately, not all use the same erase or
programming algorithms (Lattice, National Semiconductor, and SGS Thomson
 use one algorithm; AMD, Texas, Cypress, Altera and ICT use others).

Why do you say that pins 12 and 19 have no feedback path of their own?
 They do in my data sheets...

-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York