DS2154 datasheet(21/87 Pages) DALLAS

21 / 87 page

DS2154

21 of 87

IDR: DEVICE IDENTIFICATION REGISTER (Address=0F Hex)

(MSB)

(LSB)

T1E1

ID3

ID2

ID1

ID0

SYMBOL

POSITION

NAME AND DESCRIPTION

T1E1

IDR.7

T1 or E1 Chip Determination Bit.

0=T1 chip

1=E1 chip

ID3

IDR.3

Chip Revision Bit 3. MSB of a decimal code that represents the

chip revision.

ID2

IDR.1

Chip Revision Bit 2.

ID1

IDR.2

Chip Revision Bit 1.

ID0

IDR.0

Chip Revision Bit 0. LSB of a decimal code that represents the

chip revision.

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. (Note: this bit must be set to 0 when

RCR2.1=0).

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

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

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.

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