Altera Corporation 11
MAX 3000A Programmable Logic Device Family Data Sheet
Figure 5. MAX 3000A PIA Routing
While the routing delays of channel–based routing schemes in masked or
FPGAs are cumulative, variable, and path–dependent, the MAX 3000A
PIA has a predictable delay. The PIA makes a design’s timing
performance easy to predict.
I/O Control Blocks
The I/O control block allows each I/O pin to be individually configured
for input, output, or bidirectional operation. All I/O pins have a tri–state
buffer that is individually controlled by one of the global output enable
signals or directly connected to ground or V
CC
. Figure 6 shows the I/O
control block for MAX 3000A devices. The I/O control block has 6 or
10 global output enable signals that are driven by the true or complement
of two output enable signals, a subset of the I/O pins, or a subset of the
I/O macrocells.
To LAB
PIA
Signals
