Datasheet

Spartan-7 FPGAs Data Sheet: DC and AC Switching Characteristics
DS189 (v1.9) March 13, 2019 www.xilinx.com
Product Specification 12
AC Switching Characteristics
All values represented in this data sheet are based on the speed specifications from the Vivado® Design
Suite as outlined in Table 12.
Switching characteristics are specified on a per-speed-grade basis and can be designated as Advance,
Preliminary, or Production. Each designation is defined as follows.
Advance Product Specification
These specifications are based on simulations only and are typically available soon after device design
specifications are frozen. Although speed grades with this designation are considered relatively stable and
conservative, some under-reporting might still occur.
Preliminary Product Specification
These specifications are based on complete ES (engineering sample) silicon characterization. Devices and
speed grades with this designation are intended to give a better indication of the expected performance
of production silicon. The probability of under-reporting delays is greatly reduced as compared to
Advance data.
Production Product Specification
These specifications are released once enough production silicon of a particular device family member has
been characterized to provide full correlation between specifications and devices over numerous
production lots. There is no under-reporting of delays, and customers receive formal notification of any
subsequent changes. Typically, the slowest speed grades transition to Production before faster speed
grades.
Testing of AC Switching Characteristics
Internal timing parameters are derived from measuring internal test patterns. All AC switching
characteristics are representative of worst-case supply voltage and junction temperature conditions.
For more specific, more precise, and worst-case guaranteed data, use the values reported by the static
timing analyzer and back-annotate to the simulation net list. Unless otherwise noted, values apply to all
Spartan-7 FPGAs.
Table 12: Speed Specification Version By Device
2018.2.1 Device
1.23 XC7S6, XC7S15, XC7S25, XC7S50, XC7S75, XC7S100
1.16 XA7S6, XA7S15, XA7S25, XA7S50, XA7S75, XA7S100
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