Altera Stratix GX Transceiver - Manual (Page 133)

Altera Corporation 5–21
January 2005 Stratix GX Transceiver User Guide
XAUI Mode
Table 5–4 lists the XGMII character-to -PCS code-group mapping.
8B/10B Encoder
The 8B/10B encoder is part of the Stratix GX transceiver blocks. The
purpose of the 8B/10B encoder is to translate 8-bit data and a 1-bit control
identifier (via tx_ctrlenable) into a 10-bit DC balanced data stream.
For additional information about the 8B/10B code itself, refer to “8B/10B
Code” on page 10–1 . The 8B/10B encoder translates the 8-bit data or 8-bit
control character to its 10-bit equivalent. The conversion format is shown
in
Figure 5–18 . The10-bit resultant data is transmitted LSB first by the
serializer.
Table 5–4. XGMII Character to PCS Code-Group Mapping Note (1)
XGMII XGMII TXD PCS Code-Group Description
0 00 though FF Dxx,y Normal data
transmission
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 Any other value K30.7 Invalid XGMII
character
Note to Table 5–4 :
(1) Values in TXD column are in hexadecimal.