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| 型號： | LC4256C-75F256AI |
| 文件頁數： | 4/57頁 |
| 文件大小： | 1078K |
| 代理商： | LC4256C-75F256AI |
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Lattice Semiconductor
ispMACH 4000V/B/C Family Data Sheet
4
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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| LC4256C-75T100C | |
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| LC4256V-10F256AI | |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LC4256C-75F256AI1 | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs |
| LC4256C-75F256BC | 功能描述:CPLD - 復雜可編程邏輯器件 PROGRAMMABLE SUPER FAST HI DENSITY PLD RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
| LC4256C-75F256BC1 | 制造商:LATTICE 制造商全稱:Lattice Semiconductor 功能描述:3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs |
| LC4256C75F256BI | 制造商:Lattice Semiconductor Corporation 功能描述: |
| LC4256C-75F256BI | 功能描述:CPLD - 復雜可編程邏輯器件 PROGRAMMABLE SUPER FAST HI DENSITY PLD RoHS:否 制造商:Lattice 系列: 存儲類型:EEPROM 大電池數量:128 最大工作頻率:333 MHz 延遲時間:2.7 ns 可編程輸入/輸出端數量:64 工作電源電壓:3.3 V 最大工作溫度:+ 90 C 最小工作溫度:0 C 封裝 / 箱體:TQFP-100 |
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