DS2154 datasheet(37/87 Pages) DALLAS

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DS2154

37 of 87

SR2: STATUS REGISTER 2 (Address=07 Hex)

(MSB)

(LSB)

RMF

RAF

TMF

SEC

TAF

LOTC

RCMF

TSLIP

SYMBOL

POSITION

NAME AND DESCRIPTION

RMF

SR2.7

Receive CAS Multiframe. Set every 2 ms (regardless if CAS

signaling is enabled or not) on receive multiframe boundaries.

Used to alert the host that signaling data is available.

RAF

SR2.6

Receive Align Frame. Set every 250

µs at the beginning of

align frames. Used to alert the host that Si and Sa bits are

available in the RAF and RNAF registers.

TMF

SR2.5

Transmit Multiframe. Set every 2 ms (regardless if CRC4 is

enabled) on transmit multiframe boundaries. Used to alert the

host that signaling data needs to be updated.

SEC

SR2.4

1-Second Timer. Set on increments of 1 second based on

RCLK. If CCR2.7=1, then this bit will be set every 62.5 ms

instead of once a second.

TAF

SR2.3

Transmit Align Frame. Set every 250

µs at the beginning of

align frames. Used to alert the host that the TAF and TNAF

registers need to be updated.

LOTC

SR2.2

Loss of Transmit Clock. Set when the TCLK pin has not

transitioned for one channel time (or 3.9

µs). Will force the

LOTC pin high if enabled via TCR2.0.

RCMF

SR2.1

Receive

CRC4

Multiframe.

Set

CRC4

multiframe

boundaries; will continue to be set every 2 ms on an arbitrary

boundary if CRC4 is disabled.

TSLIP

SR2.0

Transmit Elastic Store Slip. Set when the elastic store has

either repeated or deleted a frame of data.

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