Owner's manual

DS2180A

041995 27/36

nizer before sync is declared. Clearing RCR.3 causes

the synchronizer to search for F

patterns (101010...)

without cross-coupling the F

pattern. Frame sync will

be established using the F

information, while multi-

frame sync will be established only if valid F

informa-

tion is present. If no valid F

pattern is identified, the syn-

chronizer will move to the F

alignment, RLOS will go

low, and a false multiframe position may be indicated by

RMSYNC. RFER will indicate when the received S-bit

pattern does not match the assumed internal multiframe

alignment. This mode will be used in applications where

non-standard S-bit patterns exist. In such applications,

multiframe alignment information can be decoded ex-

ternally by using the S-bits present at RLINK.

AVERAGE REFRAME TIME

Table 9

FRAME MODE

RCR.2=0 RCR.2=1

UNITS

FRAME MODE

MIN AVG MAX MIN AVG MAX

UNITS

193S 3.0 3.75 4.5 6.5 7.25 8.0

193E 6.0 7.5 9.0 13.0 14.5 16.0

NOTE:

1. Average Reframe Time is defined here as the average time it takes from the start of sync (rising edge of

RLOS) to the actual loading of the new alignment (on a multiframe edge) into the output receive timing.