Achronix Speedster22i SerDes Bedienungsanleitung PDF herunterladen (Seite 17)

Polarity and Bit Inversion – 10/20 bit Operation

When operating in 10bit/20bit mode, the bit order within each 10-bit word can be inverted.

This is illustrated in “Figure 7: 20 bit Order Reversal”. Effectively the most significant bit of

the least significant byte is transmitted first (i.e. bit 9 of byte 0 is transmitted first).

Figure 7: 20 bit Order Reversal

When the word order is reversed in 20-bit mode, the most significant byte (byte 1) is

swapped with the least significant byte (byte 0). This is illustrated in “Figure 8: 20-bit Word

Order Inversion”. The most significant byte will be transmitted first in such a case

Figure 8: 20-bit Byte Order Swap/Reversal

The polarity for the entire 10bit or 20bit word can be inverted as well. Polarity inversion

applies to the entire word (10 bits or 20 bits).

UG028, July 1, 2014

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Achronix Speedster22i SerDes Bedienungsanleitung Seite 17