DS2154 Dallas Semiconducotr, DS2154 Datasheet - Page 42

• Manufacturer Part Number: DS2154
• Description: Enhanced E1 Single Chip Transceiver
• Manufacturer: Dallas Semiconducotr

5.4 FAS Error Counter
FAS Count Register 1 (FASCR1) is the most significant word and FASCR2 is the least significant word
of a 12-bit counter that records word errors in the Frame Alignment Signal in timeslot 0. This counter is
disabled during loss of synchronization conditions, (RLOS = 1). Since the maximum FAS word error
count in a 1-second period is 4000, this counter cannot saturate.
FASCR1: FAS BIT COUNT REGISTER 1 (Address=02 Hex)
FASCR2: FAS BIT COUNT REGISTER 2 (Address=04 Hex)
NOTES:
1. The lower 2 bits of FASCR1 at address 02 are the most significant bits of the 10-bit CRC4 error
2. The lower 2 bits of FASCR2 at address 04 are the most significant bits of the 10-bit E-bit counter.
(MSB)
FAS11
FAS5
counter.
SYMBOL
FAS11
FAS0
FAS10
FAS4
POSITION
FASCR1.7
FASCR2.2
FAS9
FAS3
FAS8
FAS2
NAME AND DESCRIPTION
MSB of the 12-bit FAS error count.
LSB of the 12-bit FAS error count.
42 of 87
FAS7
FAS1
FAS6
FAS0
(note 2)
(note 1)
(note 2)
(note 1)
(LSB)
FASCR1
FASCR2
DS2154