XRT86VL34 datasheet(57/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

TABLE 35: PRBS CONTROL & STATUS REGISTER (PRBSCSR1)

HEX ADDRESS: 0XN123

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

PRBSTyp

R/W

PRBS Pattern Type

This bit selects the type of PRBS pattern that the T1 Transmit/

Receive framer will generate or detect. PRBS 15 (X15 + X14 +1)

Polynomial or QRTS (Quasi-Random Test Signal) Pattern can be

generated by the transmit or receive framer depending on whether

PRBS switch function is enabled or not (bit 3 in register 0xn121).

If the PRBS Switch function is disabled, T1 transmit framer will gen-

erate either PRBS 15 or QRTS pattern and output to the line inter-

face. PRBS 15 or QRTS pattern depends on the setting of this bit.

If the PRBS Switch function is enabled, T1 receive framer will gener-

ate either PRBS 15 or QRTS pattern and output to the receive back

plane interface. PRBS 15 or QRTS pattern depends on the setting

of this bit.

0 = Enables the PRBS 15 (X15 + X14 +1) Polynomial generation.

1 = Enables the QRTS (Quasi-Random Test Signal) pattern genera-

tion.

ERRORIns

R/W

Error Insertion

This bit is used to insert a single PRBS/QRTS error to the transmit

or receive output depending on whether PRBS switch function is

enabled or not. (bit 3 in register 0xn121).

If the PRBS Switch function is disabled, T1 transmit framer will

insert a single PRBS/QRTS error and output to the line interface if

this bit is enabled.

If the PRBS Switch function is enabled, T1 receive framer will insert

a single PRBS/QRTS error and output to the receive back plane

interface if this bit is enabled.

A ‘0’ to ‘1’ transition will cause one output bit inverted in the PRBS/

QRTS stream.

NOTE: This bit only works if PRBS/QRTS generation is enabled.

DATAInv

R/W

PRBS Data Invert:

This bit inverts the Transmit PRBS/QRTS output data and the

Receive PRBS/QRTS input data. The exact function of this bit

depends on whether PRBS switch function is enabled or not. (bit 3

in register 0xn121).

If the PRBS Switch function is disabled and if this bit is enabled, T1

transmit framer will invert the PRBS/QRTS data before it outputs to

the line interface, and the T1 receive framer will invert the incoming

PRBS/QRTS data before it receives it.

If the PRBS Switch function and this bit are both enabled, T1

receive framer will invert the PRBS/QRTS data before it outputs to

the line interface, and the T1 transmit framer will invert the incoming

PRBS/QRTS data before it receives it.

0 - Transmit and Receive Framer will NOT invert the Transmit and

Receive PRBS/QRTS data.

1 - Transmit and Receive Framer will invert the Transmit and

Receive PRBS/QRTS data.

XRT86VL34 Datasheet(PDF) 57 Page - Exar Corporation

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