DS2152L datasheet(27/94 Pages) DALLAS

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DS2152

27 of 93

CCR5: COMMON CONTROL REGISTER 5 (Address=19 Hex)

(MSB)

(LSB)

TJC

LLB

LIAIS

TCM4

TCM3

TCM2

TCM1

TCM0

SYMBOL

POSITION

NAME AND DESCRIPTION

TJC

CCR5.7

Transmit Japanese CRC6 Enable.

0 = use ANSI/AT&T/ITU CRC6 calculation (normal operation)

1 = use Japanese standard JT-G704 CRC6 calculation

LLB

CCR5.6

Local Loopback.

0 = loopback disabled

1 = loopback enabled

LIAIS

CCR5.5

Line Interface AIS Generation Enable. See Figure 1-1 for

details.

0 = allow normal data from TPOSI/TNEGI to be transmitted at

TTIP and TRING

1 = force unframed all 1s to be transmitted at TTIP and TRING

TCM4

CCR5.4

Transmit Channel Monitor Bit 4. MSB of a channel decode

that determines which transmit channel data will appear in the

TDS0M register. See Section 6 for details.

TCM3

CCR5.3

Transmit Channel Monitor Bit 3.

TCM2

CCR5.2

Transmit Channel Monitor Bit 2.

TCM1

CCR5.1

Transmit Channel Monitor Bit 1.

TCM0

CCR5.0

Transmit Channel Monitor Bit 0. LSB of the channel decode.

Local Loopback

When CCR5.6 is set to a 1, the DS2152 will be forced into Local LoopBack (LLB). In this loopback, data

will continue to be transmitted as normal through the transmit side of the DS2152 (unless LIAIS = 1).

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. Please see Figure 1-1 for more details. Please note that it

is not acceptable to have RCLKO tied to TCLKI during this loopback because this will cause an unstable

condition. Also it is recommended that the jitter attenuator be placed on the transmit side during this

loopback.

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