Rainbow Electronics DS2141A - Manual (Page 13)

DS2141A
021997 13/35
SR2: STATUS REGISTER 2 (21h)
(MSB) (LSB)
RMF TMF SEC RFDL TFDL RMTCH RAF LORC
SYMBOL POSITION NAME AND DESCRIPTION
RMF SR2.7 Receive Multiframe. Set on receive multiframe boundaries.
TMF SR2.6 Transmit Multiframe. Set on transmit multiframe boundaries.
SEC SR2.5 One Second Timer. Set on increments of one second based on RCLK; will
be set in increments of 999 ms, 999 ms, and 1002 ms every three seconds.
RFDL SR2.4 Receive FDL Buffer Full. Set when the receive FDL buffer (RFDL) fills to
capacity (8–bits).
TFDL SR2.3 Transmit FDL Buffer Empty. Set when the transmit FDL buffer (TFDL)
empties.
RMTCH SR2.2 Receive FDL Match Occurrence. Set when the RFDL matches either
RFDLM1 or RFDLM2.
RAF SR2.1 Receive FDL Abort. Set when eight consecutive 1’s are received in the
FDL.
LORC SR2.0 Loss of Receive Clock. Set when the RCLK pin has not transitioned for at
least 2
µ s (3 µ s +1 µ s).
IMR1: INTERRUPT MASK REGISTER 1 (7Fh)
(MSB) (LSB)
LUP LDN LOTC SLIP RBL RYEL RCL RLOS
SYMBOL POSITION NAME AND DESCRIPTION
LUP IMR1.7 Loop Up Code Detected.
0=interrupt masked.
1=interrupt enabled.
LDN IMR1.6 Loop Down Code Detected.
0=interrupt masked.
1=interrupt enabled.
LOTC IMR1.5 Loss of Transmit Clock.
0=interrupt masked.
1=interrupt enabled.
SLIP IMR1.4 Elastic Store Slip Occurrence.
0=interrupt masked.
1=interrupt enabled.
RBL IMR1.3 Receive Blue Alarm.
0=interrupt masked.
1=interrupt enabled.
RYEL IMR1.2 Receive Yellow Alarm.
0=interrupt masked.
1=interrupt enabled.