
MT9071
Preliminary Information
144
7
6
5
4
3
2
1
0
CFC7
CFC6
CFC5
CFC4
CFC3
CFC2
CFC1
CFC0
(0000
0000)
Change of Frame Alignment Counter.
This eight bit counter is incremented if a
resynchronization is done which results in a shift in the frame alignment position.
These bits make up a counter which is incremented if a resynchronization is done which results in
a shift in the frame alignment position. CFC0 is the least significant bit (LSB). This counter is
cleared with either:
a) An overflow
b) A hard reset (RESET pin)
c) A unique soft reset (RST bit detailed in Table 178 - T1 Interrupt and I/O Control - R/W Address
YF1)
d) A global soft reset (RSTC bit detailed in Table 70 - T1 & E1 Global Mode Control - R/W
Address 900)
e) A counter clear (CNCLR bit detailed in Table 178 - T1 Interrupt and I/O Control - R/W Address
YF1)
f) By the one second timer bit when in automatic counter clear mode (ACCLR bit detailed in Table
178 - T1 Interrupt and I/O Control - R/W Address YF1)
Or, this counter may be set by writing the desired value to it. The lower byte and upper byte of this
register cannot be written to independently.
Table 124 - T1 Out of Frame and Change of Frame Counters - R/W Address Y1A
Bit
Name
Functional Description
15
14
13
12
11
10
9
8
BEC7
BEC6
BEC5
BEC4
BEC3
BEC2
BEC1
BEC0
(0000
0000)
Frame Alignment Signal (FAS) Bit Error Counter.
These bits make up a counter which is
incremented for each individual error in the received PCM30 link basic frame alignment signal
(FAS) pattern (x0011011 in timeslot 0 of alternate frames). BEC0 is the least significant bit (LSB).
This counter is cleared with either:
a) An overflow
b) A hard reset (RESET pin)
c) A unique soft reset (RST bit detailed in Table 85 - E1 DL, CCS, CAS and Other Control - R/W
Address Y03)
d) A global soft reset (RSTC bit detailed in Table 70 - T1 & E1 Global Mode Control - R/W Address
900)
e) A counter clear (CNCLR bit detailed in Table 85 - E1 DL, CCS, CAS and Other Control - R/W
Address Y03)
f) By the one second timer bit when in automatic counter clear mode (ACCLR bit detailed in Table
85 - E1 DL, CCS, CAS and Other Control - R/W Address Y03)
Or, this counter may be set by writing the desired value to it. The lower byte and upper byte of this
register cannot be written to independently.
Frame Alignment Signal (FAS) Error Counter.
These bits make up a counter which is
incremented for each combined (one or more) error in the received PCM30 link basic frame
alignment signal (FAS) pattern (x0011011 in timeslot 0 of alternate frames). FEC0 is the least
significant bit (LSB). This counter is cleared with either:
a) An overflow
b) A hard reset (RESET pin)
c) A unique soft reset (RST bit detailed in Table 85 - E1 DL, CCS, CAS and Other Control - R/W
Address Y03)
d) A global soft reset (RSTC bit detailed in Table 70 - T1 & E1 Global Mode Control - R/W Address
900)
e) A counter clear (CNCLR bit detailed in Table 85 - E1 DL, CCS, CAS and Other Control - R/W
Address Y03)
f) By the one second timer bit when in automatic counter clear mode (ACCLR bit detailed in Table
85 - E1 DL, CCS, CAS and Other Control - R/W Address Y03)
Or, this counter may be set by writing the desired value to it. The lower byte and upper byte of this
register cannot be written to independently.
Table 125 - E1 FAS Bit Error Counter & FAS Error Counter - R/W Address Y1A
7
6
5
4
3
2
1
0
FEC7
FEC6
FEC5
FEC4
FEC3
FEC2
FEC1
FEC0
(0000
0000)
Bit
Name
Functional Description