R
Functional Description
Production Stepping
The Spartan-3E FPGA family uses production stepping to
indicate improved capabilities or enhanced features.
Differences Between Steppings
Table 71 summarizes the feature and performance differ-
ences between Stepping 0 devices and Stepping 1 devices.
Stepping 1 is, by definition, a functional superset of Step-
ping 0. Furthermore, configuration bitstreams generated for
Stepping 0 are compatible with Stepping 1.
Designs operating on the Stepping 0 devices perform simi-
larly on a Stepping 1 device.
Table 71: Differences between Spartan-3E Production Stepping Levels
Stepping 0
Stepping 1
Production status
Production starting
March 2006
Production from 2005 to 2007
Speed grade and operating conditions
JTAG ID code
-4C only
-4C, -4I, -5C
Different revision fields. See Table 67.
DCM DLL maximum input frequency
90 MHz
240 MHz (–4 speed grade)
(200 MHz for XC3S1200E)
275 MHz (–5 speed grade)
DCM DFS output frequency range(s)
Split ranges at 5 – 90 MHz and
220 – 307 MHz
(single range 5 – 307 MHz for
XC3S1200E)
Continuous range:
5 – 311 MHz (–4)
5 – 333 MHz (–5)
Supports multi-FPGA daisy-chain configurations
from SPI Flash
No, single FPGA only
Yes
Yes
JTAG configuration supported when FPGA in
BPI mode with a valid image in the attached
parallel NOR Flash PROM
(1)
No
JTAG EXTEST, INTEST, SAMPLE support
Yes: XC3S100E, XC3S250E, XC3S500E
Yes
All Devices
(2)
No : XC3S1200E, XC3S1600E
Power sequencing when using HSWAP Pull-Up
PCI compliance
Requires V
before V
Any sequence
Yes
CCINT
CCAUX
No
Notes:
1. Workarounds exist. See Stepping 0 Limitations when Reprogramming via JTAG if FPGA Set for BPI Configuration.
2. JTAG BYPASS and JTAG configuration are supported
Ordering a Later Stepping
-5C and -4I devices, and -4C devices (with date codes 0901
Table 72: Spartan-3E Optional Stepping Ordering
(2009) and later) always support the Stepping 1 feature set
independent of the stepping code. Optionally, to order only
Stepping 1 for the -4C devices, append an “S1” suffix to the
standard ordering code, where ‘1’ is the stepping number,
as indicated in Table 72.
Stepping
Number
Suffix Code
Status
0
1
None
S1
Production
Production
DS312-2 (v3.8) August 26, 2009
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113
Product Specification
XILINX [ XILINX, INC ]
