Hey,
I would like to access the carry-in carry-out logic that is built in to Altera's FPGA LE blocks, via the arithmetic mode.
The Cyclone IV Handbook says that the arithmetic mode is automatically created when the design uses adders and counters. See
http://www.altera.com/literature/hb/cyclone-iv/cyclone4-handbook.pdf (
http://www.altera.com/literature/hb/cyclone-iv/cyclone4-handbook.pdf) , page 2 - 3. But it also says that the mode can be created manually:
"You can also create special-purpose functions that specify which LE operating mode to use for optimal performance, if required."
When I created a multi-bit adder, the Cin to Cout path was used as the Handbook described. However, it would be nice to be able to set that mode manually, without creating an adder/counter, in order to conserve resources. How could this be done?
Thanks for any help,
Steve
