Rainbow Electronics DS2181A - Manual (Page 20)

DS2181A
041995 20/32
RSR: RECEIVE STATUS REGISTER Figure 18
(MSB) (LSB)
RRA RDMA RSA1 RUA1 FSERR MFSERR RLOS ECS
SYMBOL POSITION NAME AND DESCRIPTION
RRA RSR.7 Receive Remote Alarm. Set when bit 3 of timeslot 0 in non-align frames
set for three consecutive non-align frames.
RDMA RSR.6 Receive Distant Multiframe Alarm. Set when bit 6 of timeslot 16 in frame
0 is set for three consecutive multiframes.
RSA1 RSR.5 Receive Signalling All Ones. Set when the contents of timeslot 16 have
been all ones for two consecutive frames.
RUA1 RSR.4 Receive Unframed All Ones. Set when less thant three zeros have been
received in the last two consecutive frames.
FSERR RSR.3 Frame Resync Criteria Met. Set when the frame error criteria are met;
also the frame resync is initiated if RCR.1=0.
MFSERR RSR.2 CAS Multiframe Resync Criteria Met. Set when the CAS multiframe error
criteria are met; also, the frame resync is initiated if RCR.1=0.
RLOS RSR.1 Receive Loss of Sync. Set when resync is in progress.
ECS RSR.0 Error Counter Saturation. Set when any of the on-chip counters at FECR,
CECR or BVCR saturates.
NOTE:
1. When in the CCS mode, the RDMA flag bit and the RDMA pin have no significance. It will be set when bit 6 of
timeslot 16 in frame 0 is set for three consecutive multiframes in either CAS or CCS mode.