HC4GX15 Datasheet, PDF (361/668 Pages) Altera Corporation – HardCopy IV Device Handbook

Chapter 1: HardCopy IV GX Transceiver Architecture
1–97
Receiver Channel Datapath
Figure 1–75 shows an example of rate match deletion in the case where three ||R||
columns must be deleted.
Figure 1–75. Rate Match Deletion in XAUI Mode
datain[3]
K28.5
K28.3
K28.5
First ||R||
Column
K28.0
K28.5
Second ||R|| Third ||R|| Fourth ||R||
Column
Column
Column
K28.0
K28.0
K28.0
K28.5
datain[2]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
K28.0
K28.0
K28.5
datain[1]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
K28.0
K28.0
K28.5
datain[0]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
K28.0
K28.0
K28.5
dataout[3]
dataout[2]
dataout[1]
dataout[0]
K28.5
K28.5
K28.5
K28.5
rx_rmfifodatadeleted
K28.3
K28.3
K28.3
K28.3
K28.5
K28.5
K28.5
K28.5
K28.5
K28.5
K28.5
K28.5
K28.0
K28.0
K28.0
K28.0
K28.5
K28.5
K28.5
K28.5
Figure 1–76 shows an example of rate match insertion in the case where two ||R||
columns are required to be inserted.
Figure 1–76. Rate Match Insertion in XAUI Mode
First ||R||
Column
Second ||R||
Column
datain[3]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
datain[2]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
datain[1]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
datain[0]
K28.5
K28.3
K28.5
K28.0
K28.5
K28.0
dataout[3]
dataout[2]
dataout[1]
dataout[0]
K28.5
K28.5
K28.5
K28.5
K28.3
K28.3
K28.3
K28.3
K28.5
K28.5
K28.5
K28.5
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.0
K28.5
K28.5
K28.5
K28.5
K28.0
K28.0
K28.0
K28.0
rx_rmfifodatainserted
Two flags, rx_rmfifofull and rx_rmfifoempty, are forwarded to the core fabric
to indicate rate match FIFO full and empty conditions.
© June 2009 Altera Corporation
HardCopy IV Device Handbook Volume 3