Rainbow Electronics DS2143Q - Manual (Page 16)

DS2143/DS2143Q
031397 16/40
IMR2: INTERRUPT MASK REGISTER 2 (Address=17 Hex)
(MSB) (LSB)
RMF RAF TMF SEC TAF LOTC RCMF LORC
SYMBOL POSITION NAME AND DESCRIPTION
RMF IMR2.7 Receive CAS Multiframe.
0 = interrupt masked
1 = interrupt enabled
RAF IMR2.6 Receive Align Frame.
0 = interrupt masked
1 = interrupt enabled
TMF IMR2.5 Transmit Multiframe.
0 = interrupt masked
1 = interrupt enabled
SEC IMR2.4 One Second Timer.
0 = interrupt masked
1 = interrupt enabled
TAF IMR2.3 Transmit Align Frame.
0 = interrupt masked
1 = interrupt enabled
LOTC IMR2.2 Loss Of Transmit Clock.
0 = interrupt masked
1 = interrupt enabled
RCMF IMR2.1 Receive CRC4 Multiframe.
0 = interrupt masked
1 = interrupt enabled
LORC IMR2.0 Loss of Receive Clock.
0 = interrupt masked
1 = interrupt enabled
5.0 ERROR COUNT REGISTERS
There are a set of three counters in the DS2143 that
record bipolar violations, errors in the CRC4 SMF code
words, and E–bits as reported by the far end. Each of
these three counters are automatically updated on one
second boundaries as determined by the one second
timer in Status Register 2 (SR2.4). Hence, these regis- ters contain performance data from the previous
second. The user can use the interrupt from the one
second timer to determine when to read these registers.
The user has a full second to read the counters before
the data is lost.