HC4GX15 Datasheet, PDF (347/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
1–83
Receiver Channel Datapath
Bit-Slip Mode Word Aligner with 20-Bit PMA-PCS Interface Modes
In some Basic single-width configurations with 20-bit PMA-PCS interfaces, you can
configure the word aligner in bit-slip mode by selecting the Use manual bit slipping
mode option in the ALTGX MegaWizard Plug-In Manager.
The word aligner operation for Basic double-width with a 20-bit PMA-PCS interface is
similar to the word aligner operation in Basic single-width mode with an 8-bit
PMA-PCS interface. For word aligner operation in bit-slip mode, refer to “Word
Aligner in Single-Width Mode with 8-Bit PMA-PCS Interface Modes” on page 1–74.
The only difference is that the bit-slip word aligner in 20-bit PMA-PCS interface
modes allows only 7-, 10-, and 20-bit word alignment patterns, whereas the bit-slip
word aligner in 8-bit PMA-PCS interface modes allows only a 16-bit word alignment
pattern.
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3