Datasheet

DS21352/DS21552
46 of 137
SR1: STATUS REGISTER 1 (Address=20 Hex)
(MSB) (LSB)
LUP LDN LOTC RSLIP RBL RYEL LRCL RLOS
SYMBOL POSITION NAME AND DESCRIPTION
LUP SR1.7 Loop Up Code Detected. Set when the loop up code as defined in the RUPCD register
is being received. See Section 16.5 for details.
LDN SR1.6 Loop Down Code Detected. Set when the loop down code as defined in the RDNCD
register is being received. See Section 16.5 for details.
LOTC SR1.5 Loss of Transmit Clock. Set when the TCLK pin has not transitioned for one channel
time (or 5.2 ms). Will force the RLOS/LOTC pin high if enabled via CCR1.6. Also will
force transmit side formatter to switch to RCLK if so enabled via TCR1.7.
RSLIP SR1.4 Receive Elastic Store Slip Occurrence. Set when the receive elastic store has either
repeated or deleted a frame.
RBL SR1.3 Receive Blue Alarm. Set when an unframed all one’s code is received at RPOSI and
RNEGI.
RYEL SR1.2 Receive Yellow Alarm. Set when a yellow alarm is received at RPOSI and RNEGI.
LRCL SR1.1 Line Interface Receive Carrier Loss. Set when a red alarm is received at RTIP and
RRING.
RLOS SR1.0 Receive Loss of Sync. Set when the device is not synchronized to the receive T1
stream.