XRT86VL34 datasheet(61/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

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

TABLE 37: TRANSMIT LOOPBACK CODER REGISTER (TLCR)

HEX ADDRESS: 0XN125

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

7-1

TXLBC[6:0]

R/W

1010101

Transmit Loopback Code

These seven bits determine the transmit loopback code. The MSB

of the transmit loopback code is loaded first for transmission.

TXLBCENB

R/W

Transmit Loopback Code Enable

This bit enables loopback code generation in the transmit path.

Transmit loopback code is generated by writing the transmit loop-

back code in this register and enabling it using this bit. The length

and the format of the transmit loopback code is determined by the

Loopback Code Control Register (Register address: 0xn124)

0 = Disables the transmit loopback code generation.

1 = Enables the transmit loopback code generation.

TABLE 38: RECEIVE LOOPBACK ACTIVATION CODE REGISTER (RLACR)

HEX ADDRESS: 0XN126

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

7-1

RXLBAC[6:0]

R/W

1010101

Receive activation loopback code

These seven bits determine the receive loopback activation code.

The MSB of the receive activation loopback code is received first.

RXLBACENB

R/W

Receive activation loopback code enable

This bit enables the receive loopback activation code detection.

Receive loopback activation code is detected by writing the

expected receive activation loopback code in this register and

enabling it using this bit.

The length and format of the Receive loopback activation code is

determined by the Loopback Code Control Register (Register

0xn124).

0 = Disables the receive loopback code activation detection.

1 = Enables the receive loopback code activation detection.

TABLE 39: RECEIVE LOOPBACK DEACTIVATION CODE REGISTER (RLDCR)

HEX ADDRESS: 0XN127

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

7-1

RXLBDC[6:0]

R/W

1010101

Receive deactivation loopback code

These seven bits determine the receive loopback deactivation code.

The MSB of the receive deactivation loopback code is received first.

RXLBDCENB

R/W

Receive deactivation loopback code enable

This bit enables the receive loopback deactivation code detection.

Receive loopback deactivation code is detected by writing the

expected receive deactivation loopback code in this register and

enabling it using this bit.

The length and format of the Receive loopback deactivation code is

determined by the Loopback Code Control Register (Register

0xn124).

0 = Disables the receive loopback code deactivation detection.

1 = Enables the receive loopback code deactivation detection.

XRT86VL34 Datasheet(PDF) 61 Page - Exar Corporation

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