Alignment Boundaries - Xilinx 7 Series User Manual

boundary. In such applications, RXBYTEISALIGNED should not be used as a valid indicator of the
change in byte boundary after the first assertion.

Alignment Boundaries

The allowed boundaries for alignment are defined by ALIGN_COMMA_WORD. The spacing of
the possible boundaries is determined by RX_DATA_WIDTH, and the number of boundary
positions is determined by the number of bytes in the RXDATA interface (refer to
page 214
X-Ref Target - Figure 4-30
7 Series FPGAs GTP Transceivers User Guide
UG482 (v1.9) December 19, 2016
for RX_DATA_WIDTH settings).
R X_D A T A_W ID T H A L IG N_C O M M A_W O R D
1 6/2 0
(2-b yte)
1 6/2 0
(2-b yte)
3 2/4 0
(4-b yte)
3 2/4 0
(4-b yte)
Figure 4-30: Comma Alignment Boundaries
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Figure 4-30 shows the boundaries that can be selected.
P o ssib le R X A lig n m e n ts
(G re y = C o m m a C a n A p pe ar o n B yte)
1
2
1
2
RX Byte and Word Alignment
Table 4-43,
B yte1 B yte0
B yte1 B yte0
B yte3 B yte2 B yte1 B yte0
B yte3 B yte2 B yte1 B yte0
UG482_c4_19_112811
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