Cyclone Device Handbook, Volume 1
Figure 2–27. Cyclone IOE Structure
Logic Array
OE Register
OE
D
Q
Output Register
Output
D
Q
Combinatorial
input (1)
Input
Input Register
D
Q
Note to Figure 2–27:
(1) There are two paths available for combinatorial inputs to the logic array. Each path
contains a unique programmable delay chain.
The IOEs are located in I/O blocks around the periphery of the Cyclone
device. There are up to three IOEs per row I/O block and up to three IOEs
per column I/O block (column I/O blocks span two columns). The row
I/O blocks drive row, column, or direct link interconnects. The column
I/O blocks drive column interconnects. Figure 2–28 shows how a row
I/O block connects to the logic array. Figure 2–29 shows how a column
I/O block connects to the logic array.
2–40
Preliminary
Altera Corporation
January 2007
ALTERA [ ALTERA CORPORATION ]
