XC3S100E Datasheet, PDF (123/193 Pages) Xilinx, Inc – DC and Switching Characteristics

Pinout Descriptions
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Table 1: Types of Pins on Spartan-3E FPGAs
Type /
Color Code
Description
Pin Name(s) in Type
JTAG
Dedicated JTAG pin. Not available as a user-I/O pin. Every package has four
dedicated JTAG pins. These pins are powered by VCCAUX.
TDI, TMS, TCK, TDO
GND
Dedicated ground pin. The number of GND pins depends on the package used. GND
All must be connected.
VCCAUX
Dedicated auxiliary power supply pin. The number of VCCAUX pins depends on VCCAUX
the package used. All must be connected to +2.5V.
VCCINT
Dedicated internal core logic power supply pin. The number of VCCINT pins
depends on the package used. All must be connected to +1.2V.
VCCINT
VCCO
Along with all the other VCCO pins in the same bank, this pin supplies power to VCCO_#
the output buffers within the I/O bank and sets the input threshold voltage for
some I/O standards.
N.C.
This package pin is not connected in this specific device/package combination N.C.
but may be connected in larger devices in the same package.
Notes:
1. # = I/O bank number, an integer between 0 and 3.
I/Os with Lxxy_# are part of a differential output pair. ‘L’ indi-
cates differential output capability. The “xx” field is a
two-digit integer, unique to each bank that identifies a differ-
ential pin-pair. The ‘y’ field is either ‘P’ for the true signal or
‘N’ for the inverted signal in the differential pair. The ‘#’ field
is the I/O bank number.
Differential Pair Labeling
A pin supports differential standards if the pin is labeled in
the format “Lxxy_#”. The pin name suffix has the following
significance. Figure 1 provides a specific example showing
a differential input to and a differential output from Bank 1.
‘L’ indicates that the pin is part of a differentiaL pair.
"xx" is a two-digit integer, unique for each bank, that
identifies a differential pin-pair.
‘y’ is replaced by ‘P’ for the true signal or ‘N’ for the
inverted. These two pins form one differential pin-pair.
‘#’ is an integer, 0 through 3, indicating the associated
I/O bank.
Pair Number
Bank 0
Spartan-3E
FPGA
Bank 2
IO_L38P_1
IO_L38N_1
IO_L39P_1
IO_L39N_1
Figure 1: Differential Pair Labeling
Bank Number
Positive Polarity,
True Driver
Negative Polarity,
Inverted Driver
DS312-4_00_022305
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DS312-4 (v1.1) March 21, 2005
Advance Product Specification