描述

How many cycles do the crc_err_a and crc_err_b remain asserted for?

According to the following documentation, it is only asserted for one cycle, but the code appears to be for one line?

• XAPP1014 - Audio/Video Connectivity Solutions for Virtex-5 FPGAs
• XAPP1076 - Implementing Triple-Rate SDI with Spartan-6 FPGA GTP Transceivers
• UG823 - LogiCORE IP Virtex-6 FPGA Triple-Rate SDI v1.0 User Guide
• UG824 - LogiCORE IP Spartan-6 FPGA Triple-Rate SDI v1.0 User Guide
• PG071 - SMPTE SD/HD/3G-SDI v1.0 Product Guide v1.0

解决方案

The crc_err_a and crc_err_b are asserted for each line in which a CRC error is detected. 

The CRC is only sent once per line, and only checked once per line.

Please see (Xilinx Answer 40473) for a detailed list of LogiCORE IP Triple Rate SDI Release Notes and Known Issues.
Please see (Xilinx Answer 42805) for a detailed list of LogiCORE IP Spartan-6 FPGA Triple-Rate SDI Release Notes and Known Issues.
Please see (Xilinx Answer 50905) for a detailed list of LogiCORE IP SMPTE SD/HD/3G-SDI Release Notes and Known Issues.

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