XC3S100E_06 Datasheet, PDF (182/231 Pages) Xilinx, Inc – Configurable Logic Block (CLB)

Pinout Descriptions
R
User I/Os by Bank
Table 137 and Table 138 indicate how the 108 available
user-I/O pins are distributed between the four I/O banks on
the TQ144 package.
Table 137: User I/Os Per Bank for the XC3S100E in the TQ144 Package
Package
Maximum
Edge
I/O Bank
I/O
I/O
All Possible I/O Pins by Type
INPUT
DUAL
VREF
Top
0
26
9
6
1
2
Right
1
28
0
5
21
2
Bottom
2
26
0
4
20
2
Left
3
28
13
4
0
3
TOTAL
108
22
19
42
9
CLK
8
0⁽¹⁾
0⁽¹⁾
8
16
Notes:
1. The eight global clock pins in this bank have optional functionality during configuration and are counted in the DUAL column.
Table 138: User I/Os Per Bank for the XC3S250E in TQ144 Package
Package
Maximum
Edge
I/O Bank
I/O
I/O
All Possible I/O Pins by Type
INPUT
DUAL
VREF
Top
0
26
9
6
1
2
Right
1
28
0
5
21
2
Bottom
2
26
0
4
20
2
Left
3
28
11
6
0
3
TOTAL
108
20
21
42
9
CLK
8
0⁽¹⁾
0⁽¹⁾
8
16
Notes:
1. The eight global clock pins in this bank have optional functionality during configuration and are counted in the DUAL column.
Footprint Migration Differences
Table 139 summarizes any footprint and functionality differ-
ences between the XC3S100E and the XC3S250E FPGAs
that may affect easy migration between devices. There are
four such pins. All other pins not listed in Table 139 uncon-
ditionally migrate between Spartan-3E devices available in
the TQ144 package.
The arrows indicate the direction for easy migration. For
example, a left-facing arrow indicates that the pin on the
XC3S250E unconditionally migrates to the pin on the
XC3S100E. 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 139: TQ144 Footprint Migration Differences
TQ144 Pin
Bank
XC3S100E Type
Migration
XC3S250E Type
P10
3
I/O
Å
INPUT
P29
3
I/O
Å
INPUT
P31
3
VREF(INPUT)
Æ
VREF(I/O)
P66
2
VREF(INPUT)
Æ
VREF(I/O)
DIFFERENCES
4
Legend:
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.
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DS312-4 (v3.4) November 9, 2006
Product Specification