FLEX 10K Embedded Programmable Logic Family Data Sheet
I/O Element
An I/O element (IOE) contains a bidirectional I/O buffer and a register
that can be used either as an input register for external data that requires
a fast setup time, or as an output register for data that requires fast clock-
to-output performance. In some cases, using an LE register for an input
register will result in a faster setup time than using an IOE register. IOEs
can be used as input, output, or bidirectional pins. The Quartus and
MAX+PLUS II Compilers use the programmable inversion option to
invert signals from the row and column interconnect automatically where
appropriate. Figure 13 shows the IOE block diagram.
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Altera Corporation
ALTERA [ ALTERA CORPORATION ]
