DS2153Q 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2153Q

E1 Single-Chip Transceiver

Dallas Semiconductor -> Maxim Integrated 

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

(MSB)

RSMF

RSM

RSIO

-

-

FRC

SYNCE

DS2153Q

(LSB)

RESYNC

SYMBOL POSITION NAME AND DESCRIPTION

RSMF

RSM

RSIO

-

-

FRC

SYNCE

RESYNC

RCR1.7

RCR1.6

RCR1.5

RCR1.4

RCR1.3

RCR1.2

RCR1.1

RCR1.0

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

RSYNC Mode Select.

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

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

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)

Not Assigned. Should be set to 0 when written.

Not Assigned. Should be set to 0 when written.

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

Sync Enable.

0=auto resync enabled

1=auto resync disabled

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

FAS

FAS present in frames N and N + 2, and

FAS not present in frame N + 1.

CRC4

CAS

Two valid MF alignment words found

within 8 ms.

Valid MF alignment word found and

previous time slot 16 contains code

other than all 0s.

RESYNC CRITERIA

Three consecutive incorrect FAS

received.

Alternate (RCR1.2=1) the above

criteria is met or three consecutive

incorrect bit 2 of non-FAS received.

915 or more CRC4 code words out

of 1000 received in error.

Two consecutive MF alignment

words received in error.

ITU

SPEC.

G.706

4.1.1

4.1.2

G.706

4.2

4.3.2

G.732

5.2

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