Datasheet

Spartan-7 FPGAs Data Sheet: DC and AC Switching Characteristics
DS189 (v1.9) March 13, 2019 www.xilinx.com
Product Specification 50
Table 48: Sample Window
Symbol Description
V
CCINT
Operating Voltage and Speed
Grade
Units
1.0V 0.95V
-2 -1 -1L
T
SAMP
Sampling error at receiver pins.
(1)
0.64 0.70 0.70 ns
T
SAMP_BUFIO
Sampling error at receiver pins using BUFIO.
(2)
0.40 0.46 0.46 ns
Notes:
1. This parameter indicates the total sampling error of the Spartan-7 FPGAs DDR input registers, measured across voltage, temperature, and
process. The characterization methodology uses the MMCM to capture the DDR input registers’ edges of operation. These measurements
include:
- CLK0 MMCM jitter
- MMCM accuracy (phase offset)
- MMCM phase shift resolution
These measurements do not include package or clock tree skew.
2. This parameter indicates the total sampling error of the Spartan-7 FPGAs DDR input registers, measured across voltage, temperature, and
process. The characterization methodology uses the BUFIO clock network and IDELAY to capture the DDR input registers’ edges of operation.
These measurements do not include package or clock tree skew.
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