BT8376EPF datasheet(189/323 Pages) CONEXANT

189 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.12 Transmitter Registers

N8370DSE

Conexant

3-71

071—Transmitter Configuration (TCR1)

TNRZ

Transmit NRZ Data—Transmit dual-rail unipolar outputs TPOSO/TNEGO are replaced by

non-return to 0 unipolar data (TNRZO) and transmit multiframe sync (MSYNCO). Both

outputs are clocked on the rising edge of transmitter clock (TCKI). Line encoding of bipolar

signals on XTIP/XRING is unaffected. MSYNCO active (high) always marks the first bit of

transmit multiframe according to the selected transmit framer mode.

0 = TPOSO/TNEGO encoded per TZCS[1:0]

1 = TPOSO/TNEGO replaced by TNRZO/MSYNCO

TABORT

Abort/Disable TX Offline Framer—The offline framer ignores reframe requests from the

online framer (TLOF) and aborts any in progress TLOF reframe requests. The loss of frame

status [TLOF; addr 048] is not affected. While TABORT remains active, the offline framer

responds only to the processor force reframe request (TFORCE). This allows the processor to

manually control reframe criteria or lock out changes in the current transmit frame alignment.

0 = normal framer operation

1 = framer disabled

TABORT interacts with EMBED [addr 0D0] to select which data stream is examined by

online and offline transmit framer during embedded framing modes. If EMBED is active,

TXDATA output from TSLIP is examined and used to align the TX timebase; otherwise, the

TPCMI data stream is examined and used to align the TSB timebase, as defined in Table 3-19.

TFORCE

Force TX Reframe (auto clear)—Forces the offline framer to perform a single reframe,

according to the selected transmit framer mode. TFORCE is automatically cleared when the

framer acknowledges a request [ACTIVE; addr 017]. The processor typically does not need to

force a reframe, because the online framer reframe request (TLOF) is active when reframe

criteria TLOFC–A is met. However, the processor may attempt force a reframe if the frame or

CRC bit error ratio indicates that the framer has aligned to a mimic pattern.

0 = no effect

1 = force TX reframe

TNRZ

TABORT

TFORCE

TLOFC

TLOFB

TLOFA

TZCS[1]

TZCS[0]

Table 3-19. Transmit Framer Position

TABORT

EMBED

TSB Alignment

Tx Alignment

Tx Framing Mode

Notes

TPCMI

Flywheel

Transmit Framing

(1–5)

TFSYNC/TMSYNC

TXDATA

Embedded Framing

(6–8)

TFSYNC/TMSYNC

Flywheel

Normal

(5, 6)

NOTE(S):

(1) TFSYNC and TMSYNC must be programmed as outputs.

(2) Offline framer examines TPCMI to supply TSB frame alignment.

(3) Online framer examines TPCMI to supply TSB multiframe alignment.

(4) SBI mode must match 2048 k or 1544 k line rate.

(5) TX timebase flywheels at initial alignment until TSB_CTR or TX_ALIGN [addr 0D4].

(6) TSB timebase flywheels if TFSYNC/TMSYNC programmed as outputs.

(7) Offline framer examines TXDATA to supply TX frame alignment.

(8) Online framer examines TXDATA to supply TX multiframe alignment.

BT8376EPF Datasheet(PDF) 189 Page - Synaptics Incorporated.

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