DS2154 datasheet(35/87 Pages) DALLAS

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DS2154

35 of 87

CRC4 SYNC COUNTER

The CRC4 Sync Counter increments each time the 8 ms CRC4 multiframe search times out. The counter

is cleared when the DS2154 has successfully obtained synchronization at the CRC4 level. The counter

can also be cleared by disabling the CRC4 mode (CCR1.0=0). This counter is useful for determining the

amount of time the DS2154 has been searching for synchronization at the CRC4 level. ITU G.706

suggests that if synchronization at the CRC4 level cannot be obtained within 400 ms, then the search

should be abandoned and proper action taken. The CRC4 Sync Counter will rollover.

SR1: STATUS REGISTER 1 (Address=06 Hex)

(MSB)

(LSB)

RSA1

RDMA

RSA0

RSLIP

RUA1

RRA

RCL

RLOS

SYMBOL

POSITION

NAME AND DESCRIPTION

RSA1

SR1.7

Receive Signaling All 1s / Signaling Change. Set when the

contents of timeslot 16 contains less than three 0s over 16

consecutive frames. This alarm is not disabled in the CCS

signaling mode. Both RSA1 and RSA0 will be set if a change in

signaling is detected.

RDMA

SR1.6

Receive Distant MF Alarm. Set when bit 6 of timeslot 16 in

frame 0 has been set for two consecutive multiframes. This

alarm is not disabled in the CCS signaling mode.

RSA0

SR1.5

Receive Signaling All 0s / Signaling Change. Set when over a

full MF, timeslot 16 contains all 0s. Both RSA1 and RSA0 will

be set if a change in signaling is detected.

RSLIP

SR1.4

Receive Side Elastic Store Slip. Set when the elastic store has

either repeated or deleted a frame of data.

RUA1

SR1.3

Receive Unframed All 1s. Set when an unframed all 1s code is

received at RPOSI and RNEGI.

RRA

SR1.2

Receive Remote Alarm. Set when a remote alarm is received at

RPOSI and RNEGI.

RCL

SR1.1

Receive Carrier Loss. Set when 255 (or 2048 if CCR3.0=1)

consecutive 0s have been detected at RTIP and RRING. [Note: a

test mode exists to allow the DS2154 to detect carrier loss at

RPOSI and RNEGI in place of detection at RTIP and RRING].

RLOS

SR1.0

Receive Loss of Sync. Set when the device is not synchronized

to the receive E1 stream.

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