Stratix GX Transceivers
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. Code Conversion
XGMII TXC
XGMII TXD
PCS Code-Group
Description
0
1
00 through FF
07
Dxx.y
Normal data
K28.0 or K28.3 or
K28.5
Idle in ||I||
1
1
1
1
1
1
07
K28.5
K28.4
K27.7
K29.7
K30.7
Idle in ||T||
Sequence
Start
9C
FB
FD
FE
Terminate
Error
SeeIEEE802.3 See IEEE 802.3
reserved code reserved code groups
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 x7+x6+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 are done automatically by the transmit state
machine.
Serializer (Parallel-to-Serial Converter)
The serializer converts the parallel 8-bit or 10-bit data into a serial stream,
transmitting the LSB first. The serialized stream is then fed to the transmit
buffer. Figure 2–5 is a diagram of the serializer.
Altera Corporation
June 2006
2–9
Stratix GX Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
