Datasheet

DS21Q50
41 of 87
6.4 FAS Error Counter
FAS count register 1 (FASCR1) is the most significant word and FASCR2 is the least significant word of
a 16-bit counter that records word errors in the frame alignment signal (FAS) in time slot 0. This counter
is disabled when RLOS is high. FAS errors are not counted when the framer is searching for FAS
alignment and/or synchronization at either the CAS or CRC4 multiframe level. Since the maximum FAS-
word error count in a one-second period is 4000, this counter cannot saturate.
Register Name:
FASCR1, FASCR2
Register Description:
FAS Error Count Registers
Register Address:
06 Hex, 07 Hex
Bit 7 6 5 4 3 2 1 0
Name FAS15 FAS14 FAS13 FAS12 FAS11 FAS10 FAS9 FAS8
Name FAS7 FAS6 FAS5 FAS4 FAS3 FAS2 FAS1 FAS0
NAME BIT FUNCTION
FAS15 FASCR1.7 MSB of the 16-bit FAS error count
FAS0 FASCR2.0 LSB of the 16-bit FAS error count