R
XC9500XL High-Performance CPLD Family Data Sheet
The product term allocator can re-assign product terms
from any macrocell within the FB by combining partial sums
of products over several macrocells, as shown in
In this example, the incremental delay is only 2
*
T
PTA
. All 90
product terms are available to any macrocell, with a maxi-
mum incremental delay of 8
*
T
PTA.
Product Term
Allocator
Macrocell Logic
With 2
Product Terms
Product Term
Allocator
Product Term
Allocator
Macrocell Logic
With 18
Product Terms
Product Term
Allocator
DS054_07 _042101
Figure 7:
Product Term Allocation Over Several
Macrocells
DS054 (v2.5) May 22, 2009
Product Specification
8
XILINX [ XILINX, INC ]
