TransWarp GS: Difference between revisions
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== GALs == | == What Are GALs == | ||
The Generic Array Logic (also known as GAL) device was an innovation of the PAL (Programmable Array Logic) and was invented by Lattice Semiconductor. The GAL was an improvement on the PAL, which itself was an improvement on standard Gate Locig ICs like the 74-series. A GAL can emulate many PALs and 74-series ICs in one device, saving cost, power, and PCB real estate. Its primary benefit, however, was that it was eraseable and re-programmable, making prototyping and design changes easier for engineers. AE used a set of 8 GALs on the TransWarp GS. | |||
AE sometimes used the part number suffix "N" and other times they used "I". "N" labeled parts have a "-" separating them, whereas the early "I" labeled parts have a "-" for separation and later used ".". It is not clear why the differences in suffixes. However there does not seem to be a version difference. The differences could | == AE's GAL Markings == | ||
AE sometimes used the part number suffix "N" and other times they used "I". "N" labeled parts have a "-" separating them, whereas the early "I" labeled parts have a "-" for separation and later used ".". It is not clear why the differences in suffixes. However there does not seem to be a version difference or the way the GALs are programed. This separation and suffix change was product wide and not limited to the TransWarp GS. The differences could have been from when Don Pote sold AE to a new owner in the early 1990's. | |||
The earliest GALs have an "-I" suffix, and all labels are silk screen printed to the GALs. | |||
== GAL Speed Grades == | |||
== Why Different GAL Versions == | |||
Revision as of 07:06, 28 August 2017
What Are GALs
The Generic Array Logic (also known as GAL) device was an innovation of the PAL (Programmable Array Logic) and was invented by Lattice Semiconductor. The GAL was an improvement on the PAL, which itself was an improvement on standard Gate Locig ICs like the 74-series. A GAL can emulate many PALs and 74-series ICs in one device, saving cost, power, and PCB real estate. Its primary benefit, however, was that it was eraseable and re-programmable, making prototyping and design changes easier for engineers. AE used a set of 8 GALs on the TransWarp GS.
AE's GAL Markings
AE sometimes used the part number suffix "N" and other times they used "I". "N" labeled parts have a "-" separating them, whereas the early "I" labeled parts have a "-" for separation and later used ".". It is not clear why the differences in suffixes. However there does not seem to be a version difference or the way the GALs are programed. This separation and suffix change was product wide and not limited to the TransWarp GS. The differences could have been from when Don Pote sold AE to a new owner in the early 1990's.
The earliest GALs have an "-I" suffix, and all labels are silk screen printed to the GALs.