Datasheet

DS21352/DS21552
48 of 137
SR2: STATUS REGISTER 2 (Address=21 Hex)
(MSB) (LSB)
RMF TMF SEC RFDL TFDL RMTCH RAF RSC
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 3 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 one’s are received in the FDL.
RSC SR2.0 Receive Signaling Change. Set when the DS21352/552 detects a change of state in
any of the robbed–bit signaling bits.