CS61583 datasheet(14/44 Pages) CIRRUS

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Alarm Indication Signal

In coder mode, the TNEG pin becomes the

alarm indication signal (AIS) output controlled

by the receiver. The receiver detects the AIS

condition on observation of 99.9% ones density

in a 5.3 ms period (< 9 zeros in 8192 bits) and

sets the AIS pin high. The AIS condition is ex-

ited when

≥ 9 zeros are detected in 8192 bits.

Bipolar Violation Detection

In coder mode, the RNEG pin becomes the bipo-

lar violation (BPV) strobe output controlled by

the receiver. The BPV pin goes high for one

RCLK period when a bipolar violation is de-

tected in the received signal. Note that B8ZS or

HDB3 zero substitutions are not flagged as bipo-

lar violations when the decoder is enabled.

Loss of Signal

The loss of signal (LOS) indication is detected

by the receiver and reported when the LOS pin

is high. Loss of signal is indicated when 175

±15

consecutive zeros are received. The LOS condi-

t i o n i s e x i ted accordi ng to t h e ANSI

T1.231-1993 criteria that requires 12.5% ones

density over 175

±75 bit periods with no more

than 100 consecutive zeros. Note that bit errors

may occur at RPOS and RNEG (or RDATA)

prior to the LOS indication if the analog input

level falls below the receiver sensitivity.

The LOS pin is set high when the device is reset

or in powered up and returns low when data is

recovered by the receiver.

Transmit All Ones

Transmit all ones is selected by setting the

TAOS pin high. Selecting TAOS causes continu-

ous ones to be transmitted to the line interface

on TTIP and TRING at the frequency of

REFCLK. In this mode, the transmit data inputs

TPOS and TNEG (or TDATA) are ignored. A

TAOS overrides the data transmitted to the line

interface during local and remote loopbacks.

Local Loopback

A local loopback is selected by setting the

LLOOP pin high. Selecting LLOOP causes the

TCLK, TPOS, and TNEG (or TDATA) inputs to

be looped back through the jitter attenuator (if

enabled) to the RCLK, RPOS, and RNEG (or

RDATA) outputs. Data received at the line inter-

face is ignored, but data at TPOS and TNEG (or

TDATA) continues to be transmitted to the line

interface at TTIP and TRING.

A TAOS request overrides the data transmitted to

the line interface during local loopback. Note

that simultaneous selection of local and remote

loopback modes is not valid.

Remote Loopback

A remote loopback is selected by setting the

RLOOP pin high. Selecting RLOOP causes the

data received from the line interface at RTIP and

RRING to be looped back through the jitter at-

tenuator (if enabled) and retransmitted on TTIP

and TRING. Data transmitted at TPOS and

TNEG (or TDATA) is ignored, but data recov-

ered from RTIP and RRING continues to be

transmitted on RPOS and RNEG (or RDATA).

Remote loopback is functional if TCLK is ab-

sent. A TAOS request overrides the data

transmitted to the line interface during a remote

loopback. Note that simultaneous selection of lo-

cal and remote loopback modes is not valid.

Reset Pin

The CS61583 is continuously calibrated during

operation to insure the performance of the device

over power supply and temperature. The con-

tinuous calibration function eliminates the need

to reset the line interface during operation.

A device reset may be selected by setting the

RESET pin high for a minimum of 200 ns. The

reset function initiates on the falling edge of RE-

SET and takes less than 20 ms to complete. The

control logic is initialized and the transmit and

CS61583

DS172PP5

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