BT8375 CONEXANT [Conexant Systems, Inc], BT8375 Datasheet - Page 148

• 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]

3.0 Registers
3.6 Primary Control and Status Registers
FOUND
Table 3-5. Maximum Average Reframe Time (MART) and Framer Timeout
3-30
Frame Search Successful—Active-high indicates the offline framer located the frame
alignment according to the selected receive or transmit framer mode. Refer to
maximum average reframe time.
If the reframe pulse causes the receive timebase to align to a position that differs from its
existing alignment, the change of frame alignment error counter [COFA; addr 05A]
increments. Changes of the transmit frame alignment are not detected.
NOTE:
Upon detection of frame alignment, the following occurs:
• FOUND goes active-high
• RLOF or TLOF is cleared by the online framer, depending on RX/TX direction
• the offline framer goes inactive, if no pending reframe requests exist
• the RX, TX, or TSB timebase is realigned, depending on the RX/TX direction and the
embedded framing mode.
In E1 receive framer modes, the offline framer also reports intermediate FRED,
MRED, and SRED status [ALM3; addr 049] while searching for FAS, MFAS, and
CAS alignment, respectively.
NOTE(S):
known good pseudo-random DS1 input is applied, and the time that a valid DS0 signal is
observed at the output.
Framer Mode
ESF + MIMIC
ESF + CRC
Ft + T1DM
SF + TIDM
SF + JYEL
0 = no candidate; search active, aborted, or timed out
1 = frame alignment found (1 and only 1 candidate)
MFAS
CAS
SLC
ESF
FAS
SF
Ft
MART is defined (per Bellcore TA-0278) as the difference between the time that
Conexant
15.0 ms
10.0 ms
15.0 ms
15.0 ms
10.0 ms
3.5 ms
1.0 ms
3.5 ms
4.5 ms
2.0 ms
0.5 ms
2.0 ms
MART
Fully Integrated T1/E1 Framer and Line Interface
TIMEOUT (addr 017)
8 ms 125 s
8 ms 125 s
8 ms 125 s
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
12 ms 1 bit
24 ms 1 bit
24 ms 1 bit
24 ms 1 bit
24 ms 1 bit
Bt8370/8375/8376
Table 3-5
N8370DSE
for