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參數(shù)資料
| 型號(hào)： | LC4384x |
| 廠商： | Lattice Semiconductor Corporation |
| 英文描述： | 3.3V/2.5V/1.8V In-System Programmable SuperFAST High density PDLs |
| 中文描述： | 3.3V/2.5V/1.8V在系統(tǒng)可編程超快高密度PDLs |
| 文件頁數(shù)： | 5/91頁 |
| 文件大?。?/td> | 851K |
| 代理商： | LC4384X |
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Lattice Semiconductor
ispMACH 4000V/B/C/Z Family Data Sheet
5
Figure 3. AND Array
Enhanced Logic Allocator
Within the logic allocator, product terms are allocated to macrocells in product term clusters. Each product term
cluster is associated with a macrocell. The cluster size for the ispMACH 4000 family is 4+1 (total 5) product terms.
The software automatically considers the availability and distribution of product term clusters as it
fi
ts the functions
within a GLB. The logic allocator is designed to provide three speed paths: 5-PT fast bypass path, 20-PT Speed
Locking path and an up to 80-PT path. The availability of these three paths lets designers trade timing variability for
increased performance.
The enhanced Logic Allocator of the ispMACH 4000 family consists of the following blocks:
Product Term Allocator
Cluster Allocator
Wide Steering Logic
Figure 4 shows a macrocell slice of the Logic Allocator. There are 16 such slices in the GLB.
Figure 4. Macrocell Slice
PT0
PT1
PT2
PT3
PT4
Cluster 0
In[0]
In[34]
In[35]
Note:
Indicates programmable fuse.
PT80
PT81
PT82
Shared PT Clock
Shared PT Initialization
Shared PTOE
PT77
PT78
PT79
PT76
Cluster 15
to
n
+1
to
n
-1
to
n
-2
from
n
-1
from
n
-4
from
n
+2
from
n
+1
5-PT
From
n
-4
1-80
PTs
To
n
+4
Fast 5-PT
Path
To XOR (MC)
Cluster
Individual Product
Term Allocator
Cluster
Allocator
SuperWIDE
Steering Logic
n
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