BT8376EPF datasheet(148/323 Pages) CONEXANT

148 / 323 page

3.0 Registers

Bt8370/8375/8376

3.6 Primary Control and Status Registers

Fully Integrated T1/E1 Framer and Line Interface

3-30

Conexant

N8370DSE

FOUND

Frame Search Successful—Active-high indicates the offline framer located the frame

alignment according to the selected receive or transmit framer mode. Refer to Table 3-5 for

maximum average reframe time.

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.

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:

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.

0 = no candidate; search active, aborted, or timed out

1 = frame alignment found (1 and only 1 candidate)

Table 3-5. Maximum Average Reframe Time (MART) and Framer Timeout

Framer Mode

MART

TIMEOUT (addr 017)

3.5 ms

12 ms

±1 bit

Ft + T1DM

1.0 ms

12 ms

±1 bit

3.5 ms

12 ms

±1 bit

SF + JYEL

4.5 ms

12 ms

±1 bit

SF + TIDM

2.0 ms

12 ms

±1 bit

SLC

15.0 ms

24 ms

±1 bit

ESF

10.0 ms

24 ms

±1 bit

ESF + CRC

15.0 ms

24 ms

±1 bit

ESF + MIMIC

15.0 ms

24 ms

±1 bit

FAS

0.5 ms

8 ms

±125 µs

CAS

2.0 ms

8 ms

±125 µs

MFAS

10.0 ms

8 ms

±125 µs

NOTE(S):

MART is defined (per Bellcore TA-0278) as the difference between the time that

known good pseudo-random DS1 input is applied, and the time that a valid DS0 signal is

observed at the output.

BT8376EPF Datasheet(PDF) 148 Page - Synaptics Incorporated.

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