DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
SR2: STATUS REGISTER 2 (Address = 07 Hex)
(MSB)
(LSB)
RMF
RAF
TMF
SEC
TAF
LOTC
RCMF
TSLIP
SYMBOL POSITION
NAME AND DESCRIPTION
Receive CAS Multiframe. Set every 2ms (regardless if CAS signaling is
enabled or not) on receive multiframe boundaries. Used to alert the host
that signaling data is available.
RMF
RAF
TMF
SEC
SR2.7
SR2.6
SR2.5
SR2.4
SR2.3
SR2.2
Receive Align Frame. Set every 250ns at the beginning of align frames.
Used to alert the host that Si and Sa bits are available in the RAF and
RNAF registers.
Transmit Multiframe. Set every 2ms (regardless if CRC4 is enabled) on
transmit multiframe boundaries. Used to alert the host that signaling data
needs to be updated.
One Second Timer. Set on increments of one second based on RCLK. If
CCR2.7=1, then this bit will be set every 62.5ms instead of once a
second.
Transmit Align Frame. Set every 250ns at the beginning of align
frames. Used to alert the host that the TAF and TNAF registers need to
be updated.
TAF
Loss of Transmit Clock. Set when the TCLK pin has not transitioned
for one channel time (or 3. ns). Will force the LOTC pin high if enabled
via TCR2.0.
LOTC
Receive CRC4 Multiframe. Set on CRC4 multiframe boundaries; will
continue to be set every 2ms on an arbitrary boundary if CRC4 is
disabled.
RCMF
TSLIP
SR2.1
SR2.0
Transmit Elastic Store Slip. Set when the elastic store has either
repeated or deleted a frame of data.
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