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| 型號(hào)： | XCS05-3CS256C |
| 廠商： | Xilinx, Inc. |
| 英文描述： | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| 中文描述： | 斯巴達(dá)和Spartan - xL的家庭現(xiàn)場可編程門陣列 |
| 文件頁數(shù)： | 17/66頁 |
| 文件大小： | 809K |
| 代理商： | XCS05-3CS256C |
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R
DS060 (v1.5) March 2, 2000
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4-17
Spartan and Spartan-XL Families Field Programmable Gate Arrays
3-State Long Line Drivers
A pair of 3-state buffers is associated with each CLB in the
array. These 3-state buffers (BUFT) can be used to drive
signals onto the nearest horizontal longlines above and
multiplexed or bidirectional buses on the horizontal lon-
glines, saving logic resources.
There is a weak keeper at each end of these two horizontal
longlines. This circuit prevents undefined floating levels.
However, it is overridden by any driver.
The buffer enable is an active High 3-state (i.e., an active
Low enable), as shown in
Table 11
.
Three-State Buffer Example
Figure 18
shows how to use the 3-state buffers to imple-
ment a multiplexer. The selection is accomplished by the
buffer 3-state signal.
Pay particular attention to the polarity of the T pin when
using these buffers in a design. Active High 3-state (T) is
identical to an active Low output enable, as shown in
Table 11
.
0
1
0
1
M
M
0
1
0
1
M
0
1
M
M
0
3
1
M
M
I
G1
G4
F2
F1
F3
C
OUT
G2
G3
F4
C
IN
S2000_01
TO
GENERATORS
M
M
M
C
OUT0
Figure 17: Detail of Spartan/XL Dedicated Carry Logic
Table 11: Three-State Buffer Functionality
IN
X
IN
T
1
0
OUT
Z
IN
D
N
D
C
D
B
D
A
A
B
C
N
Z = D
A
A + D
B
B + D
C
C + D
N
N
~100 k
"Weak Keeper"
X6466
BUFT
BUFT
BUFT
BUFT
Figure 18: 3-state Buffers Implement a Multiplexer
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XCS05-3CS256I | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS280C | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS280I | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS84C | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS84I | Spartan and Spartan-XL Families Field Programmable Gate Arrays |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XCS05-3CS256I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS280C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS280I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS84C | 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays |
| XCS05-3CS84I | 制造商:XILINX 制造商全稱:XILINX 功能描述:Spartan and Spartan-XL Families Field Programmable Gate Arrays |
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