XC3S50A Xilinx Corp., XC3S50A Datasheet - Page 75

• Manufacturer Part Number: XC3S50A
• Description: Spartan-3a Fpga Family Data Sheet
• Manufacturer: Xilinx Corp.

Footprint Migration Differences
Unconnected Balls on XC3S50A
Table 65
differences between the XC3S50A and the XC3S200A or
XC3S400A FPGAs that might affect easy migration
between 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
mode (parallel Flash), see
Table 65: FT256 Footprint Migration Differences
DS529-4 (v1.5) July 10, 2007
Product Specification
FT256
G13
G14
G16
Ball
A12
B12
D10
E10
E16
F14
F15
F16
H13
K13
J10
J11
C7
G3
G4
G5
G6
H4
H5
H6
A7
E2
E3
E7
F3
F8
K4
J4
J6
L1
summarizes any footprint and functionality
Bank
R
0
0
0
0
0
3
3
0
0
1
3
0
1
1
1
3
3
3
3
1
1
1
3
3
3
1
3
3
1
1
3
1
3
N.C.
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.
N.C.
N.C.
N.C.
Table
XC3S50A
Type
66. If using the BPI configuration
Table
67.
Migration
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
INPUT
INPUT
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
INPUT
INPUT
I/O
I/O
I/O
XC3S200A/
XC3S400A
Type
www.xilinx.com
Table 65: FT256 Footprint Migration Differences (Continued)
Differential I/O Alignment Differences
Also, some differential I/O pairs on the XC3S50A FPGA are
aligned differently than the corresponding pairs on the
XC3S200A or XC3S400A FPGAs, as shown in
the mismatched pairs are in I/O Bank 2. The shading
highlights the differences.
Table 66: Differential I/O Differences in FT256
FT256
Ball
M10
M13
M14
M15
M16
N10
N12
L13
L14
L16
P13
FT256
M3
N7
P6
R7
L2
L3
L4
T7
Ball
R13
T14
Legend:
N6
R5
T3
T5
DIFFERENCES
Bank
3
3
3
1
1
1
3
2
1
1
1
1
2
2
2
2
2
2
2
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.
Bank
2
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.
XC3S50A
Type
IO_L04P_2/VS2
IO_L03N_2/VS1
IO_L06P_2
IO_L05N_2/D7
IO_L20P_2
IO_L18N_2
XC3S50A
Migration
52
Pinout Descriptions
IO_L03N_2/VS2
IO_L04P_2/VS1
IO_L05N_2
IO_L06P_2/D7
IO_L18N_2
IO_L20P_2
XC3S200A
XC3S400A
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
Table
XC3S200A/
XC3S400A
Type
66. All
75