VSC6134
Datasheet
2.7.10
2.7.11
Test PRBS Generation
For information about the test PRBS generation, see “PRBS Generator (PRBSGEN),” page 149.
FEC Encoder Bypass Multiplexer
The multiplexer (Mux) selects encoded data (FECENC_BYPASS = 0), unmodified received data -
either SDH/SONET or standard OTUk data (FECENC_BYPASS = 1), or test PRBS or OTUk AIS data
(ADD_FEC_PRBS_SEL = 1). For the drop path, the encoder bypass is outside the FEC encoder block.
The multiplexer block I/O is shown in the following table.
Table 42. Multiplexer Block I/O Description
Name
Direction
Function
tx_resetn
IN
IN
Transmit reset
tx_clk
Transmit clock
bypass
IN
Encoder and overhead generation bypass
Select PRBS test data (OTUk AIS)
Bypass data
prbs_gen
xckdata[63:0]
injerrdata[63:0]
prbsdata[63:0]
mxotuais
IN
IN
IN
Encoder data
IN
PRBS data
IN
Select OTUk AIS data
Data out
dataout[63:0]
OUT
2.7.12
FEC Encoder Registers
For information about the FEC encoder registers, see “FEC Encoder Registers,” page 255.
105 of 438
VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
