-d, N          Use device number N. [Default: 0]
-v, --verbose  Print additional debug information.
-h, --help     Print help and exit.
-V,            Print version and exit.
--chunk_length
 	Chunk Length in hex [bytes].
 	Must pad with 4 '0's
 	Default: --chunk_length=0x3C
--endian_mode
 	Elink endian mode. One bit per egroup.
 	0x00 =  little-endian
 	0x7F =  big-endian
 	default: 0x00
--data_format
 	Elink data format. Two bits per egroup.
 	0x3FFF =  AURORA (lpGBT only)
 	0x1555 =  8b10b mode
 	0x0000 =  direct mode
 	default: 0x1555
--elink_input_width
 	Elink input data width. One bit per egroup.
 	0x00 =  8-bit (direct mode)
 	0x7F =  10-bit (8b10b mode)
 	default: 0x7F
--elink_output_width
 	Elink output data width. Three bits per egroup.
 	For Each E-Group
 	0x0 = e-link set to 2 bit (GBT only)
 	0x1 = e-link set to 4-bit (GBT only)
 	0x2 = e-link set to 8-bit
 	0x3 = e-link set to 16-bit (lpGBT only)
 	0x4 = e-link set to 32-bit (lpGBT only)
 	default GBT: 0x002240   (8b 4b 4b 2b 2b)
 	default lpGBT: 0x1246D2 (32b 32b 32b 16b 16b 8b 8b)
--elink_enable
 	For Each E-Group
 	GBT:
 	  0x00 = all e-links disabled
 	  0xFF = all e-links enabled, for 2-bit width
 	  0x55 = all e-links enabled, for 4-bit width
 	  0x11 = all e-links enabled, for 8-bit width
 	  0x01 = all e-links enabled, for 16-bit width
 	  default: 0x115555FFFF (8b 4b 4b 2b 2b)
 	lpGBT (only 28 bits used):
 	  0x0 = all e-links disabled
 	  0xF = all e-links enabled, for 8-bit width
 	  0x5 = all e-links enabled, for 16-bit width
 	  0x1 = all e-links enabled, for 32-bit width
 	  default: 0x00011155FF (32b 32b 32b 16b 16b 8b 8b)
--b_channel_select
 	TTC Config. Select b-channel data bit from GBT word.
 	0x21 = Elink0 - 2-bit TTC
 	0x23 = Elink0 - 4-bit TTC
 	0x27 = Elink0 - 8-bit TTC
 	0xFF = unused
