Polarity and bit inversion – 8/16 bit operation, Figure 9: polarity inversion (16-bit word), Figure 10: bit order inversion (16-bit word) – Achronix Speedster22i SerDes User Manual
Page 18
Polarity and Bit Inversion – 8/16 bit Operation
When the polarity is inverted in 8bit/16bits mode, only bits [17:10] and [7:0] are inverted, bits
[19:18] and [9:8] are not inverted. This is illustrated in “Figure 9: Polarity Inversion (16-bit
Figure 9: Polarity Inversion (16-bit Word)
When the bit order is inverted in 8bit/16bit mode, bits [7:0] of byte 0 are swapped while bits
[9:8] are not swapped. Similarly bits [17:10] of byte 1 are swapped. This is illustrated in
“Figure 10: Bit Order Inversion (16-bit Word)”. In this mode, the most significant bit of the
least significant byte is transmitted first.
Figure 10: Bit Order Inversion (16-bit Word)
When the word order is inverted in 16-bit mode, byte 1 is swapped with byte 0. This is
illustrated in “Figure 11: Word Order Inversion (16-bit Word)”.
18
UG028, July 1, 2014