Arria GX Architecture
GIGE Mode
In GIGE mode, the transmit state machine converts all idle ordered sets
(/K28.5/, /Dx.y/) to either /I1/ or /I2/ ordered sets. The /I1/ set
consists of a negative-ending disparity /K28.5/ (denoted by /K28.5/-),
followed by a neutral /D5.6/. The /I2/ set consists of a positive-ending
disparity /K28.5/ (denoted by /K28.5/+) and a negative-ending
disparity /D16.2/ (denoted by /D16.2/-). The transmit state machines do
not convert any of the ordered sets to match /C1/ or /C2/, which are the
configuration ordered sets. (/C1/ and /C2/ are defined by [/K28.5/,
/D21.5/] and [/K28.5/, /D2.2/], respectively). Both the /I1/ and /I2/
ordered sets guarantee a negative-ending disparity after each ordered set.
XAUI Mode
The transmit state machine translates the XAUI XGMII code group to the
XAUI PCS code group. Table 2–3 shows the code conversion.
Table 2–3. On-Chip Termination Support by I/O Banks
XGMII TXC XGMII TXD
PCS Code-Group
Description
0
00 through FF
Dxx.y
Normal data
1
1
1
1
1
1
1
07
K28.0 or K28.3 or K28.5
Idle in ||I||
Idle in ||T||
Sequence
Start
07
K28.5
9C
FB
FD
FE
K28.4
K27.7
K29.7
Terminate
Error
K30.7
See IEEE 802.3 reserved
code groups
See IEEE 802.3 reserved code groups
Reserved code groups
1
Other value
K30.7
Invalid XGMII character
The XAUI PCS idle code groups, /K28.0/ (/R/) and /K28.5/ (/K/), are
automatically randomized based on a PRBS7 pattern with an ×7 + ×6 + 1
polynomial. The /K28.3/ (/A/) code group is automatically generated
between 16 and 31 idle code groups. The idle randomization on the /A/,
/K/, and /R/ code groups is done automatically by the transmit state
machine.
Altera Corporation
May 2008
2–9
Arria GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
