Datasheet

DS21Q50
55 of 87
Table 15-1. OUTA and OUTB Function Select
OA3 OA2 OA1 OA0
OB3 OB2 OB1 OB0
FUNCTION
0 0 0 0
External Hardware Control Bit. In this mode, OUTA and OUTB can be used as
simple control pins for external circuitry. Use OA4 and OB4 to toggle OUTA and
OUTB.
0 0 0 1 Receive Recovered Clock, RCLK
0 0 1 0
Receive Loss-of-Sync Indicator. Real-time hardware version of SR1.0
(Table 5-1
)
0 0 1 1
Receive Loss Of Carrier Indicator. Real-time hardware version of SR1.1
(Table 5-1
)
0 1 0 0
Receive Remote Alarm Indicator. Real-time hardware version of SR1.2
(Table 5-1
)
0 1 0 1
Receive Unframed All Ones Indicator. Real-time hardware version of SR1.3
(Table 5-1
)
0 1 1 0
Receive Slip Occurrence Indicator. One-clock-wide pulse for every slip of the
receive elastic store. Hardware version of SR1.4.
0 1 1 1
Receive CRC Error Indicator. One-clock-wide pulse for every multiframe that
contains a CRC error. Output forced to 0 during loss of sync.
1 0 0 0 Loss Of Transmit Clock Indicator. Real-time hardware version SR2.2 (Table 5-1)
1 0 0 1 RFSYNC. Recovered frame-sync pulse.
1 0 1 0
PRBS Bit Error. A half-clock-wide pulse for every bit error in the received PRBS
pattern.
1 0 1 1
TDATA/RDATA
OUTB outputs an NRZ version of the transmit data stream (TDATA) prior to the
transmit line interface.
OUTA outputs the received serial data stream (RDATA) prior to the elastic store.
1 1 0 0 Receive CRC4 Multiframe Sync. Recovered CRC4 MF sync pulse.
1 1 0 1 Receive CAS Multiframe Sync. Recovered CAS MF sync pulse.
1 1 1 0
Transmit Current Limit. Real-time indicator that the TTIP and TRING outputs
have reached their 50mA current limit.
1 1 1 1
TPOS/TNEG Output. This mode outputs the AMI/HDB3 encoded transmit data.
OUTA outputs TNEG data.
OUTB outputs TPOS data.