DS21458LDK Maxim Integrated, DS21458LDK Datasheet - Page 82

Manufacturer Part Number

DS21458LDK

Description

Network Controller & Processor ICs

Manufacturer

Maxim Integrated

Datasheet

1.DS21458LDK.pdf (269 pages)

Bit 3/Local Loopback (LLB). In this loopback, data will continue to be transmitted as normal through the transmit side of the

transceiver. Data being received at RTIP and RRING will be replaced with the data being transmitted. Data in this loopback

will pass through the jitter attenuator.

Bit 4/Line Interface Unit Mux Control (LIUC). This bit along with the LIUC/TPD pin and LBCR.7 controls the connection

between the LIU and the Framer. See the LTS (LBCR.7) description below. When the LIUC/TPD pin is connected high or

LBCR.7 = 1, the LIUC bit has control. When the LIUC/TPD pin is connected low the framer and LIU are separated and the

LIUC bit has no effect. For the DS21458 this bit should always be set = 0.

Table 14-1. LIUC Control

Bit 5/Unused, must be set to zero for proper operation.

Bit 6/Unused, must be set to zero for proper operation.

Bit 7/LIUC/TPD Pin Function Select (LTS). This bit selects the function the of the LIUC/TPD pin. On the DS21458, this

bit should always be set = 1.

LBCR.7

(LTS)

0 = loopback disabled

1 = loopback enabled

0 = LIUC/TPD pin functions as the LIUC control (This function is not available on the DS21458)

1 = LIUC/TPD pin functions as the TPD control

LIUC/TPD

RECEIVE

TRANSMIT

LIU

LBCR.4

(LIUC)

ATTENUATOR

LIU and Framer Separated

TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins active