HC4GX15 Datasheet, PDF (415/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
Functional Modes
1–151
Table 1–41. XGMII Character to PCS Code-Group Mapping (Part 2 of 2)
XGMII TXC
1
1
1
1
1
1
XGMII TXD (1)
07
9C
FB
FD
FE
Any other value
PCD Code Group
K28.5
K28.4
K27.7
K29.7
K30.7
K30.7
Note to Table 1–41:
(1) The values in the XGMII TXD column are in hexadecimal.
Description
Idle in ||T||
Sequence
Start
Terminate
Error
Invalid XGMII
character
Figure 1–121 shows an example of mapping between XGMII characters and the PCS
code groups that are used in XAUI. The idle characters are mapped to a
pseudo-random sequence of /A/, /R/, and /K/ code groups.
Figure 1–121. Example of Mapping XGMII Characters to PCS Code Groups
XGMII
T/RxD<7..0>
T/RxD<15..8>
T/RxD<23..16>
T/RxD<31..24>
| | S Dp _{D D D} - - - _{D D D} D | | | | | |
| | Dp Dp _{D D D} - - - _{D D D T} | | | | | |
| | Dp Dp _{D D D} - - - _{D D D} | | | | | | |
| | Dp Dp _{D D D} - - - _{D D D} | | | | | | |
PCS
Lane 0
Lane 1
K R ^S Dp D D D - - - D D D D A R R K K R
K R ^Dp Dp D D D ^{- - -} D D D T A R R K K R
Lane 2
Lane 3
K R Dp Dp D D D - - - D D D K A R R K K R
K R Dp Dp D D D ^{- - -} D D D K A R R K K R
PCS code groups are sent via PCS ordered sets. PCS ordered sets consist of
combinations of special and data code groups defined as a column of code groups.
These ordered sets are composed of four code groups beginning in lane 0. Table 1–42
lists the defined idle ordered sets (||I||) that are used for the self-managed
properties of XAUI.
Table 1–42. Defined Idle Ordered Set
Code
Ordered Set
||I||
Idle
||K||
Synchronization
column
||R||
Skip column
||A||
Align column
Number of
Code Groups
4
4
4
Encoding
Substitute for XGMII Idle
/K28.5/K28.5/K28.5/K28.5/
/K28.0/K28.0/K28.0/K28.0/
/K28.3/K28.3/K28.3/K28.3/
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3