HC4GX15 Datasheet, PDF (351/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
1–87
Receiver Channel Datapath
The generic receiver polarity inversion feature is different from the PCI Express (PIPE)
8B/10B polarity inversion feature. The generic receiver polarity inversion feature
inverts the polarity of the data bits at the input of the word aligner and is not available
in PIPE mode. The PIPE 8B/10B polarity inversion feature inverts the polarity of the
data bits at the input of the 8B/10B decoder and is available only in PIPE mode.
Figure 1–64 shows the receiver polarity inversion feature in single-width 10 bit wide
datapath configurations.
Figure 1–64. Receiver Polarity Inversion in Single-Width Mode
0
1
1
0
0
1
1
0
1
rx _ invpolarity = HIGH ⁰
1
0
To Word Aligner
1
0
1
0
0
1
0
Output from Deserializer
1
Input to Word Aligner
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3