Agilent Technologies J-BERT N4903B Manual de usuario descargar pdf (Pagina 13)

Library of pre-deﬁned patterns

Many popular compliance patterns are predefined, such as:

CJTPAT, CJPAT, DisplayPort, FDDI, Fibre Channel, K28.5, PCI

Express, SAS, SATA, SDH, SONET, USB3

Patterns

PRBS: 2

-1 with n = 7, 10, 11, 15, 23, 31, and 2

with

n = 7, 10, 13, 15, 23, 31.

User definable pattern: 32 Mbit, independent for pattern genera-

tor and error detector.

Generator pattern sequencing

The generators pattern sequences can be started on command or

by a signal applied to the auxiliary input.

Sum of blocks and counted loops: Up to 120; the block resolution

of user definable pattern is 512 bits.

Loops: Over 120 or fewer blocks, 1 loop level, loop counter and

infinite.

Second output channel (Option 002): In MUX-mode the multi-

plexed 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 sequence

(block length, loops, conditions) applies for main output and the

aux output.

The error detector pattern can track patterns from the data out or

from the aux data output. Requires software revision 7.0 or later.

Pattern Generator Speciﬁcations

Figure 17. Pattern generator sequencer helps to set up complex training

sequences.

Alternate pattern

This allows switching between two patterns of equal length that

have been programmed by the user, each of which can be up

to 16 Mbit. Switching is possible using a front panel key, over

GPIB or by applying the appropriate signal to the auxiliary input

port. Changeover 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

Zeros 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.

Variable mark density

The ratio of ones to total bits in the predefined pattern library can

be set to ⅛, ¼, ½, ¾, or ⅞.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 25 26

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