EP1SGX10C Datasheet, PDF (15/262 Pages) Altera Corporation – StratixGX FPGA Family

Transceiver Blocks
XAUI Mode
The transmit state machine translates the XAUI XGMII code group to the
XAUI PCS code group. Table 8 shows the code conversion.
Table 8. Code Conversion
XGMII TXC XGMII TXD
PCS Code-Group
Description
0
00 through FF Dxx.y
Normal data
1
07
K28.0 or K28.3 or
K28.5
Idle in ||I||
1
07
K28.5
Idle in ||T||
1
9C
K28.4
Sequence
1
FB
K27.7
Start
1
FD
K29.7
Terminate
1
FE
K30.7
Error
1
See IEEE 802.3 See IEEE 802.3
Reserved Code Groups
Reserved Code Reserved Code Groups
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 7 is a diagram of the serializer.
Altera Corporation
15
Preliminary