DS2154 datasheet(31/87 Pages) DALLAS

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DS2154

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REMOTE LOOPBACK

When CCR4.7 is set to a 1, the DS2154 will be forced into Remote LoopBack (RLB). In this loopback,

data input via the RPOSI and RNEGI pins will be transmitted back to the TPOSO and TNEGO pins. Data

will continue to pass through the receive side framer of the DS2154 as it would normally and the data

from the transmit side formatter will be ignored. Please see Figure 1-1 for more details.

LOCAL LOOPBACK

When CCR4.6 is set to a 1, the DS2154 will be forced into Local LoopBack (LLB). In this loopback, data

will continue to be transmitted as normal through the transmit side of the DS2154. 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.

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

(MSB)

(LSB)

LIRST

RCM4

RCM3

RCM2

RCM1

RCM0

SYMBOL

POSITION

NAME AND DESCRIPTION

LIRST

CCR5.7

Line Interface Reset. Setting this bit from a 0 to a 1 will initiate

an internal reset that affects the clock recovery state machine and

jitter attenuator. Normally this bit is only toggled on power-up.

Must be cleared and set again for a subsequent reset.

CCR5.6

Not Assigned. Should be set to 0 when written

CCR5.5

Not Assigned. Should be set to 0 when written.

RCM4

CCR5.4

Receive Channel Monitor Bit 4. MSB of a channel decode that

determines which receive channel data will appear in the

RDS0M register. See Section 6 for details.

RCM3

CCR5.3

Receive Channel Monitor Bit 3.

RCM2

CCR5.2

Receive Channel Monitor Bit 2.

RCM1

CCR5.1

Receive Channel Monitor Bit 1.

RCM0

CCR5.0

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

DS2154 Datasheet(PDF) 31 Page - Dallas Semiconductor

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