Xilinx Virtex-4 - Page 112

112 www.xilinx.com Virtex-4 FPGA Configuration User Guide
UG071 (v1.12) June 2, 2017
Chapter 8: Readback and Configuration Verification
R
After sending readback commands to the device, comparison begins by aligning the
beginning of the readback frame data to the beginning of the FDRI write in the .bit
and .msk files. The comparison ends when the end of the FDRI write is reached.
This approach requires the least in-system storage space, because only the .bit,.msk,
and readback commands must be stored.
The .rba and .rbb files contain expected readback data along with readback
command sets. They are intended for use with the .msk file.
Figure 8-6: Comparing Readback Data Using the .msk and .bit Files
Pad Frame
Frame Data
File Header
Frame Data
Mask
To t al
number
device
frames
1 frame
Readback
Data Stream
UG071_53_073007
File
Commands Commands
Commands Commands
Pad Frame Pad Frame
File Header
Frame Data
File