参数资料
型号: XCS30XL-4TQG144I
厂商: Xilinx Inc
文件页数: 11/83页
文件大小: 0K
描述: IC SPARTAN-XL FPGA 30K 144-TQFP
产品变化通告: Product Discontinuation 26/Oct/2011
标准包装: 60
系列: Spartan®-XL
LAB/CLB数: 576
逻辑元件/单元数: 1368
RAM 位总计: 18432
输入/输出数: 113
门数: 30000
电源电压: 3 V ~ 3.6 V
安装类型: 表面贴装
工作温度: -40°C ~ 100°C
封装/外壳: 144-LQFP
供应商设备封装: 144-TQFP(20x20)
其它名称: 122-1298
Spartan and Spartan-XL FPGA Families Data Sheet
DS060 (v2.0) March 1, 2013
19
Product Specification
R
Product Obsolete/Under Obsolescence
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 long-
lines, 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
Figure 17: Detail of Spartan/XL Dedicated Carry Logic
01
M
0
1
01
M
0
1
M
0
3
M
1
M
I
G1
G4
F2
F1
F3
COUT
COUT0
G2
G3
F4
CIN
DS060_17_080400
TO
FUNCTION
GENERATORS
M
Table 11: Three-State Buffer Functionality
IN
T
OUT
X1
Z
IN
0
IN
Figure 18: 3-state Buffers Implement a Multiplexer
DN
DC
DB
DA
ABC
N
Z = (DA A) + (DB B) + (DC C) + (DN N)
~100 k
Ω
"Weak Keeper"
DS060_18_080400
BUFT
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