DS2149 datasheet(11/32 Pages) MAXIM

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DS2149

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CR2 (B010001): Control Register 2

MSb

LSb

RESET

PAT1

PAT0

TAIS

ENLOOP

ALB

LLB

RLB

SYMBOL

POSITION

FUNCTION

RESET

CR2.7

Resets device states and clears all registers.

PAT1

CR2.6

Selects output data pattern (Table 4-F).

PAT0

CR2.5

Selects output data pattern (Table 4-F).

TAIS

CR2.4

0 = Transmit data normally

1 = Transmit unframed all ones

ENLOOP

CR2.3

0 = Disable in-band loop-code detection

1 = Enable in-band loop-code detection

ALB

CR2.2

0 = Disable analog loopback

1 = Enable analog loopback

LLB

CR2.1

0 = Disable local loopback

1 = Enable local loopback

RLB

CR2.0

0 = Disable remote loopback

1 = Enable remote loopback

Table 4-F. Data Pattern Selection

PAT0

PAT1

DATA SOURCE

TPOS/TNEG

Transmit QRSS

In-band loop-up 00001

In-band loop-down 001

CR3 (B010010): Control Register 3

MSb

LSb

JA6HZ

TPD

—

EQZMON20

EQZMON26

JA128

LIRST

TAOZ

SYMBOL

POSITION

FUNCTION

JA6HZ

CR3.7

0 = Set bandwidth of jitter attenuator to 3Hz

1 = Set bandwidth of jitter attenuator to 6Hz; not available if

JA128 = 1

TPD

CR3.6

0 = Enable transmitter outputs

1 = Disable transmitter outputs

—

CR3.5

—

EQZMON20

CR3.4

0 = Normal receiver operation

1 = Add 20dB of resistive gain to inbound signal

EQZMON26

CR3.3

0 = Normal receiver operation

1 = Add 26dB of resistive gain to inbound signal

JA128

CR3.2

0 = Jitter attenuator buffer depth = 32 bits

1 = Jitter attenuator buffer depth = 128 bits

LIRST

CR3.1

0 = Normal operation

1 = Reset the receive LIU state machine

TAOZ

CR3.0

0 = Disable transmit alternate 1s and 0s

1 = Enable transmit alternate 1s and 0s

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