R
Introduction and Ordering Information
Configuration
I/O Capabilities
Spartan-3E FPGAs are programmed by loading configura-
tion data into robust, reprogrammable, static CMOS config-
uration latches (CCLs) that collectively control all functional
elements and routing resources. The FPGA’s configuration
data is stored externally in a PROM or some other non-vol-
atile medium, either on or off the board. After applying
power, the configuration data is written to the FPGA using
any of seven different modes:
The Spartan-3E FPGA SelectIO interface supports many
popular single-ended and differential standards. Table 2
shows the number of user I/Os as well as the number of dif-
ferential I/O pairs available for each device/package combi-
nation.
Spartan-3E FPGAs support the following single-ended
standards:
•
•
3.3V, low-voltage TTL, LVTTL
•
•
Master Serial from a Xilinx Platform Flash PROM
Low-voltage CMOS (LVCMOS) at 3.3V, 2.5V, 1.8V,
1.5V, or 1.2V
Serial Peripheral Interface (SPI) from an
industry-standard SPI serial Flash
•
•
•
3.3V PCI at 33 MHz and 66 MHz
•
Byte Peripheral Interface (BPI) Up or Down from an
industry-standard x8 or x8/x16 parallel NOR Flash
HSTL I and III at 1.8V, typically for memory applications
SSTL I at 1.8V and 2.5V, typically for memory
applications
•
•
•
Slave Serial, typically downloaded from a processor
Slave Parallel, typically downloaded from a processor
Spartan-3E FPGAs support the following differential stan-
dards:
Boundary Scan (JTAG), typically downloaded from a
processor or system tester.
•
•
•
•
LVDS
Bus LVDS
mini-LVDS
RSDS
Table 2: Available User I/Os and Differential (Diff) I/O Pairs
VQ100
CP132
TQ144
PQ208
FT256
FG320
FG400
FG484
VQG100
CPG132
TQG144
PQG208
FTG256
FGG320
FGG400
FGG484
Device
User Diff User Diff User Diff User Diff User Diff User Diff User Diff User Diff
XC3S100E
XC3S250E
XC3S500E
XC3S1200E
XC3S1600E
66
66
-
30
30
-
-
92
92
-
-
41
41
-
108
40
40
-
-
158
158
-
-
65
65
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
108
172
190
190
-
68
77
77
-
-
-
-
-
-
232
250
250
92
99
99
-
-
-
-
-
304
304
124
124
-
-
-
-
-
-
-
376 156
Notes:
1. All Spartan-3E devices in the same package are pin-compatible.
DS312-1 (v1.1) March 21, 2005
www.xilinx.com
3
Advance Product Specification
XILINX [ XILINX, INC ]
