| 摘要 |
A chip's interface is selected by using a fuse option coupled between integrated circuitry on the chip and logic circuitry. Fuse options correspond to antifuses or fuses. In one embodiment, a plurality of fuse options are manufactured in an integrated circuit such that a fuse option is coupled between integrated circuitry on the chip and separate and complete logic circuitry for different logic types used to interface a chip. In another embodiment, only one type of logic circuitry is manufactured on a chip, such that the logic circuitry has both a pull-up and pull-down transistor. A fuse is coupled with a pull-up control circuit of the logic circuitry. When the fuse is blown, the output circuit corresponds to GTL-terminated logic circuitry, using only the pull-down transistor. In a further embodiment, an antifuse is coupled with the pull-up control circuit. When the antifuse is programmed, default GTL-terminated logic is converted to TTL family output logic, or another logic which uses both pull-up and pull-down transistors in its logic circuitry.
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