Glossary

CTT I/O standard


An I/O standard with a voltage-referenced signal, input (VREF) of 1.5, an output (VCCIO) voltage of 3.3 V, a GTL+/SSTL input buffer and a 3.3-V/2.5-V TTL output buffer. The CTT I/O standard is supported by the APEX 20KC, APEX 20KE, APEX II, ARM®-based Excalibur, Stratix, and Stratix GX device families.

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