DS2143 datasheet(13/44 Pages) DALLAS

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DS2143/DS2143Q

13 of 44

CCR: COMMON CONTROL REGISTER (Address=14 Hex)

(MSB)

(LSB)

LLB

THDB3

TG802

TCRC4

RSM

RHDB3

RG802

RCRC4

SYMBOL

POSITION

NAME AND DESCRIPTION

LLB

CCR.7

Local Loopback.

0 = loopback disabled.

1 = loopback enabled.

THDB3

CCR.6

Transmit HDB3 Enable.

0 = HDB3 disabled.

1 = HDB3 enabled.

TG802

CCR.5

Transmit G.802 Enable. See Section 13 for details.

0 = do not force TCHBLK high during bit 1 of timeslot 26.

1 = force TCHBLK high during bit 1 of timeslot 26.

TCRC4

CCR.4

Transmit CRC4 Enable.

0 = CRC4 disabled.

1 = CRC4 enabled.

RSM

CCR.3

Receive Signaling Mode Select.

0 = CAS signaling mode.

1 = CCS signaling mode.

RHDB3

CCR.2

Receive HDB3 Enable.

0 = HDB3 disabled.

1 = HDB3 enabled.

RG802

CCR.1

Receive G.802 Enable. See Section 13 for details.

0 = do not force RCHBLK high during bit 1 of timeslot 26

1 = force RCHBLK high during bit 1 of timeslot 26.

RCRC4

CCR.0

Receive CRC4 Enable.

0 = CRC4 disabled.

1 = CRC4 enabled.

LOCAL LOOPBACK

When CCR.7 is set to a 1, the DS2143 will enter a Local LoopBack (LLB) mode. This loopback is useful

in testing and debugging applications. In LLB, the DS2143 will loop data from the transmit side back to

the receive side. This loopback is synonymous with replacing the RCLK input with the TCLK signal, and

the RPOS/RNEG inputs with the TPOS/TNEG outputs. When LLB is enabled, the following will occur:

1. data at RPOS and RNEG will be ignored;

2. all receive side signals will take on timing synchronous with TCLK instead of RCLK;

3. all functions are available.

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