BT8376EPF datasheet(165/323 Pages) CONEXANT

165 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.8 Receiver Registers

N8370DSE

Conexant

3-47

3.8 Receiver Registers

Unused bits indicated by a dash (—) are reserved and should be written to 0. Writing to reserved bits has no

effect.

040—Receiver Configuration (RCR0)

RAMI

Receive AMI Encoded Inputs—Disables B8ZS/HDB3 decoding for AMI-formatted

RTIP/RRING receive signals. Otherwise, the ZCS decoder replaces the 000VB0VB code

(B8ZS) with 8 zeros in T1 mode, or replaces the X00V code (HDB3) with four zeros in E1

mode; where B is a normal AMI pulse, V is a bipolar violation, and X is a “don't-care.”

Regardless of RAMI setting, receipt of a ZCS signature is always detected and reported in

ZCSUB status [RSTAT; addr 021].

0 = receive B8ZS/HDB3 line format

1 = receive AMI line format

RABORT

Abort/Disable RX Offline Framer—When set, the offline framer ignores reframe requests

from the online framer (RLOF) and aborts any in-progress RLOF reframe request. Loss of

Frame status [RLOF; addr 047] is not affected. While RABORT remains set, the offline framer

only responds to processor forced reframes (RFORCE). This allows the processor to manually

control reframe criteria and prevent changes in the current receive frame alignment. RABORT

is typically set only during unframed operation.

0 = normal framer operation

1 = framer disabled

RFORCE

Force RX Reframe—Forces the offline framer to perform a single reframe according to

selected receive framer mode. RFORCE is automatically cleared when the offline framer

acknowledges the request [FSTAT; addr 017]. The processor typically does not need to force

the reframe since the online framer reframe request (RLOF) is active whenever reframe criteria

(RLOFD–A) is met. However, the processor may force a reframe if the frame or CRC error

ratios indicate the framer might have aligned to a duplicated frame alignment pattern.

0 = no effect

1 = force RX reframe

RAMI

RABORT

RFORCE

RLOFD

RLOFC

RLOFB

RLOFA

RZCS

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