DS2152L datasheet(40/94 Pages) DALLAS

40 / 94 page

DS2152

40 of 93

NOTES:

1. The upper nibble of the counter at address 25 is used by the Multiframes Out of Sync Count Register.

2. PCVCR counts either errors in CRC code words (in the ESF framing mode; CCR2.3=1) or errors in

the framing bit position (in the D4 framing mode; CCR2.3=0).

PATH CODE VIOLATION COUNTING ARRANGEMENTS Table 5-2

FRAMING MODE

(CCR2.3)

COUNT Fs ERRORS?

(RCR2.1)

WHAT IS COUNTED

IN THE PCVCRs

errors in the Ft pattern

yes

errors in both the Ft & Fs patterns

ESF

don't care

errors in the CRC6 code words

5.3 MULTIFRAMES OUT OF SYNC COUNT REGISTER (MOSCR)

Normally the MOSCR is used to count the number of multiframes that the receive synchronizer is out of

sync (RCR2.0=1). This number is useful in ESF applications needing to measure the parameters Loss Of

Frame Count (LOFC) and ESF Error Events as described in AT&T publication TR54016. When the

MOSCR is operated in this mode, it is not disabled during receive loss of synchronization (RLOS=1)

conditions. The MOSCR has alternate operating mode whereby it will count either errors in the Ft

framing pattern (in the D4 mode) or errors in the FPS framing pattern (in the ESF mode). When the

MOSCR is operated in this mode, it is disabled during receive loss of synchronization (RLOS=1)

conditions. See Table 5-3 for a detailed description of what the MOSCR is capable of counting.

MOSCR1:

MULTIFRAMES OUT OF SYNC COUNT REGISTER 1 (Address=25 Hex)

MOSCR2:

MULTIFRAMES OUT OF SYNC COUNT REGISTER 2 (Address=27 Hex)

(MSB)

(LSB)

MOS/FB11

MOS/FB10

MOS/FB9

MOS/FB8

(note 1)

MOSCR1

MOS/FB7

MOS/FB6

MOS/FB5

MOS/FB4

MOS/FB3

MOS/FB2

MOS/FB1

MOS/FB0

MOSCR2

SYMBOL

POSITION

NAME AND DESCRIPTION

MOS/FB11

MOSCR1.7

MSB of the 12-Bit Multiframes Out of Sync or F-Bit Error

Count (note #2)

MOS/FB0

MOSCR2.0

LSB of the 12-Bit Multiframes Out of Sync or F-Bit Error

Count (note #2)

NOTES:

1. The lower nibble of the counter at address 25 is used by the Path Code Violation Count Register.

2. MOSCR counts either errors in framing bit position (RCR2.0=0) or the number of multiframes out of

sync (RCR2.0=1).

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