Pinout Descriptions
Footprint Migration Differences
Unconnected Balls on XC3S50A
Table 73: FT256 XC3S50A Footprint Migration
Table 73 summarizes any footprint and functionality
differences between the XC3S50A and the XC3S200A or
XC3S400A FPGAs that might affect easy migration between
these devices in the FT256 package. The XC3S200A and
XC3S400A have identical pinouts. The XC3S50A pinout is
compatible, but there are 52 balls that are different.
Generally, designs easily migrate upward from the
XC3S50A to either the XC3S200A or XC3S400A. If using
differential I/O, see Table 74. If using the BPI configuration
mode (parallel Flash), see Table 75.
XC3S200A/
XC3S400A
Type
FT256
Ball
XC3S50A
Type
Bank
3
Migration
Æ
K4
K13
L1
N.C.
I/O
1
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
Æ
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
3
Æ
L2
3
Æ
L3
3
Æ
L4
3
Æ
Table 73: FT256 XC3S50A Footprint Migration Difference
L13
L14
L16
M3
1
Æ
XC3S200A/
FT256
Ball
XC3S50A
Type
XC3S400A
Type
1
Æ
Bank
0
Migration
Æ
1
Æ
A7
A12
B12
C7
N.C.
I/O
3
Æ
0
N.C.
INPUT
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
Æ
I/O
M10
M13
M14
M15
M16
N7
2
Æ
0
Æ
I/O
1
Æ
0
Æ
I/O
1
Æ
D10
E2
0
Æ
I/O
1
Æ
3
Æ
I/O
1
Æ
E3
3
Æ
I/O
2
Æ
E7
0
Æ
I/O
N10
N12
P6
2
Æ
E10
E16
F3
0
Æ
I/O
2
Æ
1
Æ
I/O
2
Æ
3
Æ
I/O
P13
R7
2
Æ
F8
0
Æ
I/O
2
Æ
F14
F15
F16
G3
1
Æ
I/O
T7
2
Æ
1
Æ
I/O
DIFFERENCES
Legend:
52
1
Æ
I/O
3
Æ
I/O
This pin can unconditionally migrate from the device
on the left to the device on the right. Migration in the
other direction is possible depending on how the pin is
configured for the device on the right.
Æ
G4
3
Æ
I/O
G5
3
Æ
INPUT
INPUT
I/O
G6
3
Æ
G13
G14
G16
H4
1
Æ
1
Æ
I/O
1
Æ
I/O
3
Æ
I/O
H5
3
Æ
I/O
H6
3
Æ
I/O
H13
J4
1
Æ
I/O
3
Æ
I/O
J6
3
Æ
I/O
J10
J11
1
Æ
INPUT
INPUT
1
Æ
88
www.xilinx.com
DS529-4 (v2.0) August 19, 2010
XILINX [ XILINX, INC ]
