MT9072AB datasheet(182/275 Pages) ZARLINK

182 / 275 page

MT9072

Data Sheet

182

Zarlink Semiconductor Inc.

Bit

Name

Functional Description

not used.

RSLP

Receive Slip. This bit changes state when a receive controlled frame slip has occurred.

RSLPD

Receive Slip Direction. If one, indicates that the last received frame slip (RSLP toggled of

faster than the network clock (EXCLi). If zero, indicates that the last received frame slip (RSLP)

resulted in a lost frame. This would occur if the system clock (CKi/2) was slower than the

network clock (EXCLi). Updated on an RSLP occurrence basis.

BSYNC Receive Basic Frame Alignment. If zero, indicates the received PCM30 link basic frame

alignment pattern (x0011011 in timeslot 0 of alternate frames) is acquired; if one, the basic

frame alignment pattern is lost or not acquired.

MSYNC Receive Multiframe Alignment. If zero, indicates the received PCM30 link signaling

multiframe alignment signal (0000xxxx in timeslot 16 of every16th frame) is acquired; if one, the

signaling multiframe alignment signal is lost or not acquired.

CSYNC Receive CRC-4 Synchronization. If zero, indicates the received PCM30 link CRC-4

multiframe alignment pattern (001011xx in timeslot 0, in bit position 1 of 16 alternate frames) is

acquired; if one, the CRC-4 multiframe alignment pattern is lost or not acquired.

9RED

RED Alarm. If one, indicates that basic frame alignment (BSYNC of register address Y10) has

been lost for at least 100 msec. This bit is cleared (zero) when basic frame alignment is

acquired.

8CEFS

Consecutively Errored Frame Alignment Signal. If one, the last two frame alignment signals

(FAS=0011011) were received in error. If zero, at least one of the last two frame alignment

signals were received without error. A non-errored FAS would result in the RFA status bits

(register address Y13) set as follows, RFA2=0, RFA3=0, RFA4=1, RFA5=1, RFA6=0, RFA7=1,

RFA8=1

not used.

RCRC0 Remote CRC-4 and RAI T10. If one, the received A bits were one and the received E bits were

zero (RCRCR register address Y10) continuously for more than 10 ms. See I.431 section

3.4.1.2 on RAI and continuous CRC error information.

RCRC1 Remote CRC-4 and RAI T450. If one, the received A bits were one and the received E bits

were zero (RCRCR register address Y10) continuously for more than 10 ms but less than

450 ms. See I.431 section 3.4.1.2 on RAI and continuous CRC error information.

4RFAIL

Remote CRC-4 Multiframe Generator/Detector Failure. If one, each of the previous five

seconds have an E-bit (E1 + E2) of error count of greater than 989 (E-bit counter 3DD hex or 11

1101 1101 address Y17), and for this same period the receive RAI bit (register addressY12 and

Y13) was zero (no remote alarm), and for the same period the BSYNC bit (register address

Y10) was equal to zero (basic frame alignment has been maintained). If zero, indicates normal

operation.

3REB1

Receive E1 Bit Status. Indicates the status of the bit (E1) received on the PCM30 link in bit

position 1 of timeslot 0 in non-frame alignment signal (NFAS) frame 13. If zero, the remote end

calculated a CRC-4 error in its received sub-multiframe one. If one, no error was calculated.

Table 153 - Synchronization & CRC-4 Remote Status (R Address Y10) (E1)

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