R
Pinout Descriptions
Footprint Migration Differences
Table 147 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 147 unconditionally
migrate between Spartan-3E devices available in the FT256
package.
and the XC3S1200E. The arrows indicate the direction for
easy migration. A double-ended arrow (ꢅꢆ) indicates that
the two pins have identical functionality. A left-facing arrow
(ꢅ) 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.
The XC3S250E is duplicated on both the left and right sides
of the table to show migrations to and from the XC3S500E
Table 147: FT256 Footprint Migration Differences
FT256
Ball
XC3S250E
Type
XC3S500E
Type
XC3S1200E
Type
XC3S250E
Type
Bank
0
Migration
ꢅꢆ
ꢆ
Migration
ꢆ
Migration
ꢅ
B6
B7
INPUT
N.C.
INPUT
I/O
INPUT
N.C.
0
I/O
ꢅꢆ
ꢆ
I/O
ꢅ
B10
C7
0
INPUT
N.C.
ꢅꢆ
ꢆ
INPUT
I/O
I/O
ꢅ
INPUT
N.C.
0
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅ
I/O
ꢅ
D16
E13
E16
F3
1
VREF(I/O)
N.C.
ꢅ
VREF(INPUT)
I/O
VREF(INPUT)
ꢆ
VREF(I/O)
N.C.
1
ꢆ
I/O
ꢅ
1
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
3
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
F4
3
N.C.
ꢆ
VREF
I/O
VREF
INPUT
VREF
I/O
ꢅ
N.C.
F5
3
I/O
ꢅꢆ
ꢆ
ꢆ
I/O
L2
3
N.C.
VREF
I/O
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢆ
ꢅ
N.C.
L3
3
N.C.
ꢆ
ꢅ
N.C.
L4
3
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
L12
L13
M4
M7
M14
N2
1
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
1
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
3
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
2
INPUT
I/O
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢆ
INPUT
I/O
I/O
ꢅ
INPUT
I/O
1
ꢅ
INPUT
VREF(INPUT)
I/O
ꢆ
3
VREF(I/O)
N.C.
VREF(I/O)
I/O
ꢅ
ꢆ
VREF(I/O)
N.C.
N7
2
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢅꢆ
ꢆ
ꢅ
N14
N15
P7
1
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
1
N.C.
ꢆ
VREF
I/O
VREF
I/O
ꢅ
N.C.
2
N.C.
ꢆ
ꢅ
N.C.
P10
R10
T12
2
N.C.
ꢆ
I/O
I/O
ꢅ
N.C.
2
N.C.
ꢆ
VREF
INPUT
VREF
I/O
ꢅ
N.C.
2
INPUT
ꢅꢆ
19
ꢅ
INPUT
DIFFERENCES
7
26
Legend:
This pin is identical on the device on the left and the right.
ꢅꢆ
ꢆ
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.
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.
ꢅ
DS312-4 (v3.8) August 26, 2009
www.xilinx.com
201
Product Specification
XILINX [ XILINX, INC ]
