Editing Programmable logic device (section)

== GALs ==
{{main|Generic array logic}}
[[Image:Lattice GAL 16V8.jpg|thumb|Lattice GAL 16V8 and 20V8.  These are 35 nanosecond devices.]]

An improvement on the PAL was the generic array logic device, or GAL, invented by [[Lattice Semiconductor]] in 1985. This device has the same logical properties as the PAL but can be erased and reprogrammed. The GAL is very useful in the prototyping stage of a design when any [[Computer bug|bugs]] in the logic can be corrected by reprogramming. GALs are programmed and reprogrammed using a PAL programmer, or, in the case of chips that support it, by using the [[in-circuit programming]] technique.

Lattice GALs combine [[CMOS]] and electrically erasable (E<sup>2</sup>) floating gate technology for a high-speed, low-power logic device. A similar device called a PEEL (programmable electrically erasable logic) was introduced by the International CMOS Technology (ICT) corporation.

Sometimes GAL chips are referred as simple programmable logic device (SPLD), analogous to complex programmable logic device (CPLD) below.