Keysigth Technologies N4903B J-BERT
dataTec ▪ Ferdinand-Lassalle-Str. 52 ▪ 72770 Reutlingen ▪ Tel. 07121 / 51 50 50 ▪ Fax 07121 / 51 50 10 ▪ info@datatec.de ▪ www.datatec.de
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13 | Keysight | J-BERT N4903B High-Performance Serial BERT, 7 Gb/s and 12.5 Gb/s - Data Sheet
Pattern Generator Specications
(continued)
ibrary of pre-deined patterns
Many popular compliance patterns are predened such as
JTPAT JPAT DisplayPort DDI ibre hannel 28.5 PI
Express SAS SATA SD SNET SB3
Patterns
PRBS 2n-1 with n 7 10 11 15 23 31 and 2n with n 7 10 13
15, 23, 31.
ser denable pattern 32 Mbit independent for pattern
generator and error detector.
Generator pattern seuencing
The generators pattern seuences can be started on command or
by a signal applied to the auxiliary input.
Sum of blocs and counted loops p to 120 the bloc resolution
of user denable pattern is 512 bits.
oops ver 120 or fewer blocs 1 loop level loop counter and
innite.
Second output channel ption 002 In MX-mode the
multiplexed PG pattern can be entered directly. In independent
channel mode individual 32 MB patterns and individual PRBS can
be set up for the data output and aux data output. The pattern
seuence bloc length loops conditions applies for main output
and the aux output.
The error detector pattern can trac patterns from the data out or
from the aux data output. Reuires software revision 7.0 or later.
Alternate pattern
This allows switching between two patterns of eual length that
have been programmed by the user each of which can be up to
16 Mbit. Switching is possible using a front panel ey over GPIB
or by applying the appropriate signal to the auxiliary input port.
hangeover occurs at the end of the pattern. The length of the
alternating patterns should be a multiple of 512 bits. Two
methods of controlling pattern changeover are available
one-shot and alternate.
Zero substitution
eros can be substituted for data to extend the longest run of
zeros in the patterns listed below. The longest run can be
extended to the pattern length-1. The bit following the
substituted zeros is set to 1.
ariable mar density
The ratio of ones to total bits in the predened pattern library can
be set to 1/8 1/4 1/2 3/4 or 7/8.
igure 17. Pattern generator seuencer helps to set up complex training seuences