Xilinx DS610 - Manual (Page 62)

DS610 (v3.0) October 4, 2010 www.xilinx.com
Product Specification 62
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Introduction
This section describes how the various pins on a Spartan®-3A DSP FPGA connect within the supported component
packages and provides device-specific thermal characteristics. For general information on the pin functions and the package
characteristics, see the Packaging section in
UG331 : Spartan-3 Generation FPGA User Guide.
Spartan-3A DSP FPGAs are available in both standard and Pb-free, RoHS versions of each package, with the Pb-free
version adding a “G” to the middle of the package code. Except for the thermal characteristics, all information for the
standard package applies equally to the Pb-free package.
Pin Types
Most pins on a Spartan-3A DSP FPGA are general-purpose, user-defined I/O pins. There are, however, up to 12 different
functional types of pins on Spartan-3A DSP packages, as outlined in
Table 57 . In the package footprint drawings that follow,
the individual pins are color-coded according to pin type as in the table.
101
Spartan-3A DSP FPGA Family:
Pinout Descriptions
DS610 (v3.0) October 4, 2010 Product Specification
Table 57: Types of Pins on Spartan-3A DSP FPGAs
Type/Color
Code
Description Pin Name(s) in Type
I/O
Unrestricted, general-purpose user-I/O pin. Most pins can be paired together to form
differential I/Os. IO_#
IO_Lxxy_#
INPUT
Unrestricted, general-purpose input-only pin. This pin does not have an output structure,
differential termination resistor, or PCI clamp diode. IP_#
IP_Lxxy_#
DUAL
Dual-purpose pin used in some configuration modes during the configuration process and
then usually available as a user I/O after configuration. If the pin is not used during
configuration, this pin behaves as an I/O-type pin. See
UG332 : Spartan-3 Generation
Configuration User Guide for additional information on these signals.
M[2:0]
PUDC_B
CCLK
MOSI/CSI_B
D[7:1]
D0/DIN
CSO_B
RDWR_B
INIT_B
A[25:0]
VS[2:0]
LDC[2:0]
HDC
VREF
Dual-purpose pin that is either a user-I/O pin or Input-only pin, or, along with all other VREF
pins in the same bank, provides a reference voltage input for certain I/O standards. If used for
a reference voltage within a bank, all VREF pins within the bank must be connected. IP/VREF_#
IP_Lxxy_#/VREF_#
IO/VREF_#
IO_Lxxy_#/VREF_#
CLK
Either a user-I/O pin or an input to a specific clock buffer driver. Packages have 16 global clock
inputs that optionally clock the entire device. The RHCLK inputs optionally clock the right half
of the device. The LHCLK inputs optionally clock the left half of the device. See the Using
Global Clock Resources chapter in
UG331 : Spartan-3 Generation FPGA User Guide for
additional information on these signals.
IO_Lxxy_#/GCLK[15:0],
IO_Lxxy_#/LHCLK[7:0],
IO_Lxxy_#/RHCLK[7:0]
CONFIG
Dedicated configuration pin, two per device. Not available as a user-I/O pin. Every package
has two dedicated configuration pins. These pins are powered by VCCAUX. See the
UG332 :
Spartan-3 Generation Configuration User Guide for additional information on the DONE and
PROG_B signals.
DONE, PROG_B