DS2151 Dallas Semiconducotr, DS2151 Datasheet - Page 22

• Manufacturer Part Number: DS2151
• Description: T1 Single-Chip Transceiver
• Manufacturer: Dallas Semiconducotr

IMR2: INTERRUPT MASK REGISTER 2 (Address=6F Hex)
5.0 ERROR COUNT REGISTERS
There are a set of three counters in the DS2151Q that record bipolar violations, excessive 0s, errors in the
CRC6 code words, framing bit errors, and number of multiframes that the device is out of receive
synchronization. Each of these three counters are automatically updated on one second boundaries as
determined by the one second timer in Status Register 2 (SR2.5). Hence, these registers contain
performance data from the previous second. The user can use the interrupt from the 1-second timer to
determine when to read these registers. The user has a full second to read the counters before the data is
lost. All three counters will saturate at their respective maximum counts and they will not rollover (note:
only the Line Code Violation Count Register has the potential to overflow).
5.1 Line Code Violation Count Register (LCVCR)
Line Code Violation Count Register 1 (LCVCR1) is the most significant word and LCVCR2 is the least
significant word of a 16-bit counter that records code violations (CVs). CVs are defined as Bipolar
Violations (BPVs) or excessive 0s. See Table 5-1 for details of exactly what the LCVCRs count. If the
(MSB)
RMF
TMF
SYMBOL POSITION NAME AND DESCRIPTION
RMTCH
RFDL
TFDL
RMF
TMF
RAF
SEC
-
SEC
IMR2.7
IMR2.6
IMR2.5
IMR2.4
IMR2.3
IMR2.2
IMR2.1
IMR2.0
RFDL
Receive Multiframe.
0=interrupt masked
1=interrupt enabled
Transmit Multiframe.
0=interrupt masked
1=interrupt enabled
One-Second Timer.
0=interrupt masked
1=interrupt enabled
Receive FDL Buffer Full.
0=interrupt masked
1=interrupt enabled
Transmit FDL Buffer Empty.
0=interrupt masked
1=interrupt enabled
Receive FDL Match Occurrence.
0=interrupt masked
1=interrupt enabled
Receive FDL Abort.
0=interrupt masked
1=interrupt enabled
Not Assigned. Should be set to 0 when written to.
22 of 51
TFDL
RMTCH
RAF
(LSB)
DS2151Q
-