User`s guide

MaxLoader User’s Guide
127
UV Erasable The characteristic of an EPROM that allows it to be erased with exposure to
short –wave ultra-violet light. This high-energy light can discharge the
floating-gate transistor cells that store bits in an EPROM. The most common
source of such light is a mercury vapor tube much like an ordinary
fluorescent tube, but without the phosphor that turns the UV light emitted by
the mercury into visible light. The light from ordinary fluorescent lamps or
sunlight generally takes years to erase an EPROM. All UV erasable parts
have a quartz windowed ceramic package that allows exposure with UV light.
Verify Reading a programmable device and comparing its contents to the desired
pattern for that device. This is a go/no-go test – it does not report what the
discrepancies are. See also: compare.
Word width The number of output pins that a memory device has. The most common size
for EPROMs is byte wide (8 bits) and “word” wide, or 16 bits. It can also
refer to the aggregate width of several memory devices used in a set.