Spartan-3E FPGA Family: Pinout Descriptions
Footprint Migration Differences
Table 146 summarizes any footprint and functionality
differences 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.
and the XC3S1200E. The arrows indicate the direction for
easy migration. A double-ended arrow () indicates that
the two pins have identical functionality. A left-facing arrow
() indicates that the pin on the device on the right
unconditionally 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
The XC3S250E is duplicated on both the left and right sides
of the table to show migrations to and from the XC3S500E
(Type = INPUT) if the I/O pin is configured as an input.
Table 146: FT256 Footprint Migration Differences
FT256
Ball
XC3S250E
Type
XC3S250E
Migration XC3S1200E Type Migration
Type
Bank
Migration
XC3S500E Type
B6
B7
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
INPUT
N.C.
INPUT
I/O
I/O
26
INPUT
N.C.
I/O
B10
C7
INPUT
N.C.
INPUT
I/O
I/O
INPUT
N.C.
I/O
D16
E13
E16
F3
VREF(I/O)
N.C.
VREF(INPUT)
I/O
VREF(INPUT)
VREF(I/O)
N.C.
I/O
N.C.
I/O
I/O
N.C.
N.C.
I/O
I/O
N.C.
F4
N.C.
VREF
I/O
VREF
INPUT
VREF
I/O
N.C.
F5
I/O
I/O
L2
N.C.
VREF
I/O
N.C.
L3
N.C.
N.C.
L4
N.C.
I/O
I/O
N.C.
L12
L13
M4
M7
M14
N2
N.C.
I/O
I/O
N.C.
N.C.
I/O
I/O
N.C.
N.C.
I/O
I/O
N.C.
INPUT
I/O
INPUT
I/O
I/O
INPUT
I/O
INPUT
VREF(INPUT)
I/O
VREF(I/O)
N.C.
VREF(I/O)
I/O
VREF(I/O)
N.C.
N7
N14
N15
P7
N.C.
I/O
I/O
N.C.
N.C.
VREF
I/O
VREF
I/O
N.C.
N.C.
N.C.
P10
R10
T12
N.C.
I/O
I/O
N.C.
N.C.
VREF
INPUT
VREF
I/O
N.C.
INPUT
19
INPUT
DIFFERENCES
7
Legend:
This pin is identical on the device on the left and the right.
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.
DS312 (v4.2) December 14, 2018
www.xilinx.com
Product Specification
195
XILINX [ XILINX, INC ]
