R
Functional Description
FXINB
FXINA
F8
X
F5
F5
FXINB
FXINA
FX
F6
F5
F5
FXINB
FXINA
FX
F7
F5
F5
FXINB
FXINA
F6
F5
FX
F5
DS312-2_38_021305
Figure 20: MUXes and Dedicated Feedback in Spartan-3E CLB
Table 11: MUX Capabilities
Total Number of Inputs per Function
For Any
Function
For Limited
Functions
MUX
F5MUX
FiMUX
Usage
F5MUX
F6MUX
F7MUX
F8MUX
Input Source
LUTs
For MUX
5
6
7
8
6 (4:1 MUX)
11 (8:1 MUX)
20 (16:1 MUX)
37 (32:1 MUX)
9
F5MUX
19
39
79
F6MUX
F7MUX
DS312-2 (v3.8) August 26, 2009
www.xilinx.com
27
Product Specification