DS2153Q datasheet(10/52 Pages) DALLAS

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DS2153Q

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RCR1: RECEIVE CONTROL REGISTER 1 (Address=10 Hex)

(MSB)

(LSB)

RSMF

RSM

RSIO

FRC

SYNCE

RESYNC

SYMBOL

POSITION

NAME AND DESCRIPTION

RSMF

RCR1.7

RSYNC Multiframe Function. Only used if the RSYNC pin is

programmed in the multiframe mode (RCR1.6=1).

0=RSYNC outputs CAS multiframe boundaries

1=RSYNC outputs CRC4 multiframe boundaries

RSM

RCR1.6

RSYNC Mode Select.

0=frame mode (see the timing in Section 13)

1=multiframe mode (see the timing in Section 13)

RSIO

RCR1.5

RSYNC I/O Select.

0=RSYNC is an output (depends on RCR1.6)

1=RSYNC is an input (only valid if elastic store enabled) (note:

this bit must be set to 0 when RCR2.1=0)

RCR1.4

Not Assigned. Should be set to 0 when written.

RCR1.3

Not Assigned. Should be set to 0 when written.

FRC

RCR1.2

Frame Resync Criteria.

0=resync if FAS received in error 3 consecutive times

1=resync if FAS or bit 2 of non-FAS is received in error 3

consecutive times

SYNCE

RCR1.1

Sync Enable.

0=auto resync enabled

1=auto resync disabled

RESYNC

RCR1.0

Resync. When toggled from low to high, a resync is initiated.

Must be cleared and set again for a subsequent resync.

SYNC/RESYNC CRITERIA Table 3-1

FRAME OR

MULTIFRAME

LEVEL

SYNC CRITERIA

RESYNC CRITERIA

ITU

SPEC.

FAS

FAS present in frames N and N + 2, and

FAS not present in frame N + 1.

Three consecutive incorrect FAS

received.

Alternate (RCR1.2=1) the above

criteria is met or three consecutive

incorrect bit 2 of non-FAS received.

G.706

4.1.1

4.1.2

CRC4

Two valid MF alignment words found

within 8 ms.

915 or more CRC4 code words out

of 1000 received in error.

G.706

4.2

4.3.2

CAS

Valid MF alignment word found and

previous time slot 16 contains code

other than all 0s.

Two consecutive MF alignment

words received in error.

G.732

5.2

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