BT8376EPF datasheet(191/323 Pages) CONEXANT

191 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.12 Transmitter Registers

N8370DSE

Conexant

3-73

072—Transmit Frame Format (TFRM)

TFRM controls the insertion of overhead bits generated by transmit frame and alarm formatters. Bypassed

overhead bits flow transparently from TPCMI system bus input through TSLIP buffer.

INS_MYEL

Insert Multiframe Yellow Alarm—Applicable to E1 modes only. Enables the alarm formatter

to output Y16 Multiframe Yellow Alarm. Once enabled, TMYEL and AUTO_MYEL [addr

075] control the alarm output state. This bit must be set to 0 in T1 modes. In ESF framed T1

mode, the YF Multiframe Yellow Alarm is transmitted by programming the DL1 data link

controller and transmitting the appropriate bit oriented code message (BOP message).

0 = bypass

1 = insert multiframe Yellow Alarm

INS_YEL

Insert Yellow Alarm—The alarm formatter outputs Yellow Alarms YB2 or YJ during T1

modes, or Y0 during E1 modes. Once enabled, TYEL and AUTO_YEL [addr 075] control the

Yellow Alarm output state. If the system wants to bypass JYEL (Fs bit in frame 12), it must

bypass all Fs bits with INS_MF [addr 072].

0 = bypass

1 = insert Yellow Alarm.

INS_MF

Insert Multiframe Alignment—The frame formatter outputs 6-bit SF alignment pattern in T1

mode, or 6-bit MFAS alignment pattern in E1 mode. INS_MF must be set while TFRAME

(addr 070) selects Fs (T1) or MFAS (E1) alignment.

0 = bypass

1 = insert multiframe alignment

INS_FE

Insert FEBE—During E1 mode, the alarm formatter automatically outputs TS0 bit 1 of frames

13 (FEBE13) and 15 (FEBE15) in response to received CRC4 errors. FEBE13 is active low for

each received CRC4 error detected in SMF I; FEBE15 is active low for each received CRC4

error detected in SMF II. INS_FE should be set while TFRAME (addr 070) selects FEBE (E1)

alignment.

0 = bypass

1 = insert FEBE

INS_CRC

Insert Cyclic Redundancy Check—The frame formatter outputs the calculated CRC6 bits in

T1 mode or CRC4 bits in E1 mode.

0 = bypass

1 = insert cyclic redundancy check

INS_FBIT

Insert Terminal Framing—The frame formatter outputs a 2-bit Ft alignment pattern in F-bits of

odd frames (SF framing) or FPS framing pattern (ESF framing) during T1 modes—or 8-bit

FAS/NFAS alignment pattern during E1 modes. INS_FBIT should be set while TFRAME

(addr 070) selects Ft (T1, SF), FPS (T1, ESF), or FAS (E1) alignment.

NOTE:

If F-bits are bypassed while TSLIP is enabled, the system must use either embedded

T1 framing or apply at least a double frame (250

µs) multiframe sync pulse

(TMSYNC) to provide odd/even frame alignment.

0 = bypass

1 = insert terminal framing

——

INS_MYEL

INS_YEL

INS_MF

INS_FE

INS_CRC

INS_FBIT

BT8376EPF Datasheet(PDF) 191 Page - Synaptics Incorporated.

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