HC4GX15 Datasheet, PDF (346/668 Pages) Altera Corporation – HardCopy IV Device Handbook

1–82
Chapter 1: HardCopy IV GX Transceiver Architecture
Receiver Channel Datapath
Figure 1–63. Manual Alignment Mode Word Aligner with 16-Bit PMA-PCS Interface Modes
rx_dataout
rx_digitalreset
xxxx
n
F628
n+1
xxxx
n+2
xxxx
n+3
xxxx
n+4
F628
xxxx
xxxx
rx_enapatternalign
rx_syncstatus[1:0]
00
10
11
00
10
11
rx_patterndetect[1:0]
00
10
00
10
00
Bit-Slip Mode Word Aligner with 16-Bit PMA-PCS Interface Modes
In some Basic double-width configurations with a 16-bit PMA-PCS interface, 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 16-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 16-bit PMA-PCS interface
modes allows 8-bit and 16-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.
Word Aligner in Double-Width Mode with 20-Bit PMA-PCS Interface Modes
A 20-bit PMA-PCS interface is supported only in Basic double-width mode.
Table 1–23 shows the word aligner configurations allowed in functional modes with a
20-bit PMA-PCS interface.
Table 1–23. Word Aligner in 20-Bit PMA-PCS Interface Modes
Functional Mode
Basic double-width
Allowed Word Aligner
Configurations
Manual Alignment, Bit-Slip
Allowed Word Alignment
Pattern Length
7 bits, 10 bits, 20 bits
Manual Alignment Mode Word Aligner with 20-Bit PMA-PCS Interface Modes
The word aligner operation in Basic double-width mode with a 20-bit PMA-PCS
interface is similar to the word aligner operation in Basic double-width mode with a
16-bit PMA-PCS interface. For word aligner operation in manual alignment mode,
refer to “Word Aligner in Double-Width Mode with 16-Bit PMA-PCS Interface
Modes” on page 1–80. The only difference is that the manual alignment mode word
aligner in 20-bit PMA-PCS interface modes allows 7-, 10-, and 20-bit word alignment
patterns, whereas the manual alignment mode word aligner in 16-bit PMA-PCS
interface modes allows only 8-, 16-, and 32-bit word alignment patterns.
HardCopy IV Device Handbook Volume 3
© June 2009 Altera Corporation