Xilinx Zynq-7000 User Manual page 362

Calibration
Calibration completes read leveling, write calibration, and read enable calibration. This is
completed over two stages. This sequence successfully completes when the cal_done
signal is asserted. For more details, see
The first stage performs per-bit read leveling calibration. The data pattern used during this
stage is 00FF00FF00FFFF00. The data pattern is first written to the memory, as shown in
Figure 2-55.
X-Ref Target - Figure 2-55
This pattern is then continuously read back while the per-bit calibration is completed, as
shown in Figure
X-Ref Target - Figure 2-56
Zynq-7000 AP SoC and 7 Series FPGAs MIS v4.1
UG586 November 30, 2016
Figure 2-55: Writes for First Stage Read Calibration
2-56.
Figure 2-56: Reads for First Stage Read Calibration
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Chapter 2: QDR II+ Memory Interface Solution
Physical Interface, page 324.
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