PRBS Generator/Checker Tab
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SNLU159B – April 2014 – Revised September 2018
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DS125DF1610EVM
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PRBS Generator/Checker Tab
The DS125DF1610 is equipped with an on-board PRBS generator as well as a PRBS checker. The PRBS
generator and PRBS checker should be operated from different channels. The PRBS generator can
generate a pseudo-random bit sequence on the transmit side of a channel. It can then be run through a
cable or backplane, and checked by the receiver channel that is configured for the PRBS checker. The
PRBS Checker must be enabled in the ‘PRBS Checker Enable/Disable Selection’ section. In order to reset
the PRBS sequence, the ‘Reset PRBS’ push button can be selected. In the ‘PRBS Pattern Status’ section
the checker will read the PRBS pattern whether that be PRBS31, PRBS15, PRBS9, or PRBS7. It will
populate the inverted or non-inverted field, as well as provide the error count, bit count, and the error rate.
The ‘PRBS Generator’ section is where the PRBS sequence length can be set. However instead of
generating a PRBS sequence, an 8-bit user pattern can be created and also inverted if desired.
Figure 12. PRBS Generator/Checker Tab
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Cross Point Switch Tab
In this tab the cross point functionality of the DS125DF1610EVM can be configured. It is divided up into 4
quads or switch matrices, each with 4 channels. By default, the DS125DF1610EVM has no cross-point
enabled and the receiver channel will route to the same transmit channel. The cross point functionality can
be used to create point to point links, or operate in broadcast mode. In point to point switching, one input
channel will be routed to only one output channel. When using broadcast mode, one input can be routed
to two, three, or four output channels. Refer to the DS125DF1610 datasheet for additional information.
The ‘TX CH x Select’ section controls the associations between receive channel and transmit channel.
When setting up point to point switching, the ‘Broadcast Channel section is not used. The ‘Signal Detected
and CDR locked’ will indicate when a receiver channel is detecting a signal, as well as indicate when the
CDR locks for a selected transmit channel. When operating the broadcast function, a master must be
selected in order to dictate which output channel will send back its adapt data to the CTLE. Refer to the
datasheet for additional information. Only one master transmit (output) channel should be selected, as
there cannot be more than one master channel in a broadcast network.