XC3S400-5FTG256C Xilinx Inc, XC3S400-5FTG256C Datasheet - Page 44
![SPARTAN-3A FPGA 400K 256-FTBGA](/photos/6/71/67101/pk053-256_sml.jpg)
XC3S400-5FTG256C
Manufacturer Part Number
XC3S400-5FTG256C
Description
SPARTAN-3A FPGA 400K 256-FTBGA
Manufacturer
Xilinx Inc
Series
Spartan™-3r
Datasheet
1.XC3S50-4VQG100C.pdf
(217 pages)
Specifications of XC3S400-5FTG256C
Number Of Logic Elements/cells
8064
Number Of Labs/clbs
896
Total Ram Bits
294912
Number Of I /o
173
Number Of Gates
400000
Voltage - Supply
1.14 V ~ 1.26 V
Mounting Type
Surface Mount
Operating Temperature
0°C ~ 85°C
Package / Case
256-LBGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Spartan-3 FPGA Family: Functional Description
Interconnect
Interconnect (or routing) passes signals among the various
functional elements of Spartan-3 devices. There are four
kinds of interconnect: Long lines, Hex lines, Double lines,
and Direct lines.
Long lines connect to one out of every six CLBs (see
Figure
are well-suited for carrying high-frequency signals with min-
imal loading effects (e.g. skew). If all eight Global Clock
Inputs are already committed and there remain additional
clock signals to be assigned, Long lines serve as a good
alternative.
Hex lines connect one out of every three CLBs (see
Figure
44
54
23a). Because of their low capacitance, these lines
23b). These lines fall between Long lines and Dou-
CLB
CLB
CLB
(c) Double Line
6
CLB
CLB
CLB
2
CLB
8
DS099-2_21_040103
6
CLB
Figure 23: Types of Interconnect
CLB
CLB
www.xilinx.com
CLB
(a) Long Line
(b) Hex Line
CLB
6
ble lines in terms of capability: Hex lines approach the
high-frequency characteristics of Long lines at the same
time, offering greater connectivity.
Double lines connect to every other CLB (see
Compared to the types of lines already discussed, Double
lines provide a higher degree of flexibility when making con-
nections.
Direct lines afford any CLB direct access to neighboring
CLBs (see
conduct a signal from a "source" CLB to a Double, Hex, or
Long line and then from the longer interconnect back to a
Direct line accessing a "destination" CLB.
For more details, refer to the “Using Interconnect” chapter in
UG331.
CLB
Figure
CLB
CLB
CLB
CLB
CLB
6
23d). These lines are most often used to
CLB
(d) Direct Lines
CLB
CLB
CLB
DS099-2 (v2.5) December 4, 2009
CLB
CLB
DS099-2_19_040103
6
DS099-2_22_040103
Product Specification
CLB
CLB
CLB
CLB
DS099-2_20_040103
CLB
Figure
23c).
R
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