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| 型號： | XCS40 |
| 廠商： | Xilinx, Inc. |
| 英文描述： | Field Programmable Gate Arrays(現(xiàn)場可編程門陣列) |
| 中文描述： | 現(xiàn)場可編程門陣列（現(xiàn)場可編程門陣列） |
| 文件頁數(shù)： | 17/66頁 |
| 文件大?。?/td> | 716K |
| 代理商： | XCS40 |
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R
DS060 (v1.5) March 2, 2000
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
below the CLB. They can therefore be used to implement
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
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