A form of PLA in whose sum of products the products (AND operations) are programmable, but the sums (OR operations) are either fixed, or programmable only to a limited extent. In the latter case, any product terms that can take part in a programmable sum are called shareable P terms.
1. phase alternation line A colour-television system developed in Germany and used in most European countries until digital conversion in the 2000s. The chrominance (colour information) signal is resolved into two components in quadrature that are used for amplitude modulation of the chrominance subcarriers. In the PAL system the relative phase of the quadrature components is reversed on alternate lines in order to minimize phase errors. Compare SECAM.
2. programmable array logic A logic device that has a number of input variables that are programmable to inputs of AND gates, the outputs of the AND gates forming fixed inputs to an OR gate whose output is the output of the PAL (see diagram).
Generalized PAL
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