Xilinx 7 Series User Manual

7 Series FPGAs GTP Transceivers User Guide www.xilinx.com 171
UG482 (v1.9) December 19, 2016
RX 8B/10B Decoder
• The corresponding RXDISPERR represents the 9th bit
• The corresponding RXCHARISK represents the 8th bit
• The corresponding RXDATA byte represents the [7:0] bits
Figure 4-34 shows a waveform at the RX data interface when the decoder receives good data (A),
data with disparity error (B), an out-of-table character (C), and an out-of-table character with
disparity error (D).
Special Characters
8B/10B decoding includes special characters (K characters) that are often used for control functions.
When RXDATA is a K character, the decoder drives RXCHARISK High.
If DEC_PCOMMA_DETECT is set to TRUE, the decoder drives the corresponding
RXCHARISCOMMA High whenever RXDATA is a positive 8B/10B comma. If
DEC_MCOMMA_DETECT is TRUE, the decoder drives the corresponding RXCHARISCOMMA
bit High whenever RXDATA is a negative 8B/10B comma.
X-Ref Target - Figure 4-34
Figure 4-34: RX Data with 8B/10B Errors
UG482_c4_23_111011
RXUSRCLK2
RXDATA
Good
Data
Both
Errors
Out of
Ta bl e
Disp
Error
Good
Data
RXDISPERR
RXNOTINTABLE
ABCD
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Xilinx 7 Series Specifications

General

Brand	Xilinx
Model	7 Series
Category	Computer Hardware
Language	English