BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 178

• Manufacturer Part Number: BT8375
• Description: single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.9 Performance Monitoring Registers
Reading BERR transfers the most recent 12-bit count from the internal PRBS error counter to BERR[11:0], and
clears the internal error counter without affecting the reported BERR[11:0] value. Subsequent reads of BERR
MSB [addr 059] report the BERR [11:8] count value latched when the BERR LSB was last read.
BERR[7:0]
BERR[11:8]
Reading AERR clears the SEF[1:0], COFA[1:0] and FRED[3:0] count values.
FRED[3:0]
COFA[1:0]
SEF[1:0]
3-60
058—PRBS Bit Error Counter LSB (BERR)
059—PRBS Bit Error Counter MSB (BERR)
05A—SEF/LOF/COFA Alarm Counter (AERR)
BERR[7]
FRED[3]
15
7
0
7
BERR Count (applicable only for test pattern)
BERR Count (suspended if BSTART = 0)
Receive Loss of Frame Count—Increments for each occurrence of FRED [ALM3; addr 049].
The 4-bit count is large enough to count more than 100 ms of MFAS timeout intervals (8 ms
each) during E1 modes. The processor can therefore use the FRED counter overflow interrupt
to indicate that a receive MFAS alignment search has timed out.
Change of Frame Alignment Count—Increments each time the offline framer generates a
reframe pulse that aligns the receiver timebase to a new bit position. Applicable to T1 modes
only.
Severely Errored Frame Count—Increments for each occurrence of SEF [ALM3; addr 049].
BERR[6]
FRED[2]
14
6
0
6
BERR[5]
FRED[1]
13
5
0
5
BERR[4]
FRED[0]
12
4
0
4
Conexant
BERR[11]
BERR[3]
COFA[1]
11
3
3
Fully Integrated T1/E1 Framer and Line Interface
BERR[10]
BERR[2]
COFA[0]
10
2
2
BERR[1]
BERR[9]
SEF[1]
Bt8370/8375/8376
1
9
1
N8370DSE
BERR[0]
BERR[8]
SEF[0]
0
8
0