XC3S100E_06 Datasheet, PDF (199/231 Pages) Xilinx, Inc – Configurable Logic Block (CLB)

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Pinout Descriptions
Footprint Migration Differences
Table 146 summarizes any footprint and functionality differ-
ences between the XC3S250E, the XC3S500E, and the
XC3S1200E FPGAs that may affect easy migration
between devices in the FG256 package. There are 26 such
balls. All other pins not listed in Table 146 unconditionally
migrate between Spartan-3E devices available in the FT256
package.
The XC3S250E is duplicated on both the left and right sides
of the table to show migrations to and from the XC3S500E
and the XC3S1200E. The arrows indicate the direction for
easy migration. A double-ended arrow (ÅÆ) indicates that
the two pins have identical functionality. A left-facing arrow
(Å) indicates that the pin on the device on the right uncon-
ditionally migrates to the pin on the device on the left. It may
be possible to migrate the opposite direction depending on
the I/O configuration. For example, an I/O pin (Type = I/O)
can migrate to an input-only pin (Type = INPUT) if the I/O
pin is configured as an input.
Table 146: FT256 Footprint Migration Differences
FT256
Ball
B6
B7
B10
C7
D16
E13
E16
F3
F4
F5
L2
L3
L4
L12
L13
M4
M7
M14
N2
N7
N14
N15
P7
P10
R10
T12
Bank
0
0
0
0
1
1
1
3
3
3
3
3
3
1
1
3
2
1
3
2
1
1
2
2
2
2
XC3S250E
Type
INPUT
N.C.
INPUT
N.C.
VREF(I/O)
N.C.
N.C.
N.C.
N.C.
I/O
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
INPUT
I/O
VREF(I/O)
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
INPUT
Migration
ÅÆ
Æ
ÅÆ
Æ
Å
Æ
Æ
Æ
Æ
ÅÆ
Æ
Æ
Æ
Æ
Æ
Æ
ÅÆ
ÅÆ
ÅÆ
Æ
Æ
Æ
Æ
Æ
Æ
ÅÆ
XC3S500E
Type
INPUT
I/O
INPUT
I/O
VREF(INPUT)
I/O
I/O
I/O
VREF
I/O
VREF
I/O
I/O
I/O
I/O
I/O
INPUT
I/O
VREF(I/O)
I/O
I/O
VREF
I/O
I/O
VREF
INPUT
Migration
Æ
ÅÆ
Æ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
Å
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
Æ
Å
Å
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
ÅÆ
Æ
XC3S1200E
Type
I/O
I/O
I/O
I/O
VREF(INPUT)
I/O
I/O
I/O
VREF
INPUT
VREF
I/O
I/O
I/O
I/O
I/O
I/O
INPUT
VREF(INPUT)
I/O
I/O
VREF
I/O
I/O
VREF
I/O
Migration
Å
Å
Å
Å
Æ
Å
Å
Å
Å
Æ
Å
Å
Å
Å
Å
Å
Å
Æ
Æ
Å
Å
Å
Å
Å
Å
Å
XC3S250E
Type
INPUT
N.C.
INPUT
N.C.
VREF(I/O)
N.C.
N.C.
N.C.
N.C.
I/O
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
INPUT
I/O
VREF(I/O)
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
INPUT
DIFFERENCES
19
7
26
Legend:
ÅÆ ^{This pin is identical on the device on the left and the right.}
Æ
This pin can unconditionally migrate from the device on the left to the device on the right. Migration in the other direction may be possible
depending on how the pin is configured for the device on the right.
Å
This pin can unconditionally migrate from the device on the right to the device on the left. Migration in the other direction may be possible
depending on how the pin is configured for the device on the left.
DS312-4 (v3.4) November 9, 2006
www.xilinx.com
199
Product Specification