參數(shù)資料
型號(hào): XC95288XL-10BG352C
英文描述: Flash Complex PLD
中文描述: 閃光復(fù)雜可編程邏輯器件
文件頁(yè)數(shù): 6/16頁(yè)
文件大?。?/td> 133K
代理商: XC95288XL-10BG352C
R
XC9500 In-System Programmable CPLD Family
6
September 15, 1999 (Version 5.0)
Product Term Allocator
The product term allocator controls how the five direct
product terms are assigned to each macrocell. For exam-
ple, all five direct terms can drive the OR function as shown
in
Figure 5
.
The product term allocator can re-assign other product
terms within the FB to increase the logic capacity of a mac-
rocell beyond five direct terms. Any macrocell requiring
additional product terms can access uncommitted product
terms in other macrocells within the FB. Up to 15 product
terms can be available to a single macrocell with only a
small incremental delay of t
PTA
,
as shown in
Figure 6
.
Note that the incremental delay affects only the product
terms in other macrocells. The timing of the direct product
terms is not changed.
Figure 5: Macrocell Logic Using Direct Product Term
Macrocell
Product Term
Logic
Product Term
Allocator
X5894
Figure 6: Product Term Allocation With 15 Product
Terms
Macrocell Logic
With 15 P-Terms
Product Term
Allocator
Product Term
Allocator
X5895
Product Term
Allocator
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