[usb] About the verfication of CRC16 in opencore USB core

[koyo@itri.org.tw]

Hello!! Everybody

I have the question about the opencore USB core.
The original verilog code is following :
assign crc16_err = data_done & (crc16_sum != 16'h800d);
I don't understand why the check number of CRC16 is 800d(Hex).

best regards  
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