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參數(shù)資料
| 型號： | XC9500 |
| 廠商： | Xilinx, Inc. |
| 英文描述： | XC9500 In-System Programmable CPLD Family |
| 中文描述： | XC9500在系統(tǒng)可編程CPLD系列 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 172K |
| 代理商： | XC9500 |
XC9500 In-System Programmable CPLD Family
6
www.xilinx.com
1-800-255-7778
DS063 (v5.1) September 22, 2003
Product Specification
R
Product Term Allocator
The product term allocator controls how the five direct prod-
uct terms are assigned to each macrocell. For example, 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
Product Term
Allocator
Macrocell
Product Term
Logic
DS063_05_110501
Figure 6:
Product Term Allocation With 15 Product
Terms
Macrocell Logic
With 15
Product Terms
Product Term
Allocator
Product Term
Allocator
DS063_06_110501
Product Term
Allocator
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