BT8376EPF datasheet(22/323 Pages) CONEXANT

22 / 323 page

1.0 Pin Descriptions

Bt8370/8375/8376

1.1 Pin Assignments

Fully Integrated T1/E1 Framer and Line Interface

1-6

Conexant

N8370DSE

Digital Transmitter (XMTR) (Continued)

TPOSI

TX Positive Rail Input

Line rate data input on TCKI falling edge. Replaces all data that would

otherwise be supplied by ZCS encoder. Bt8370/8375/8376 default power

on state selects TPOSI/TNEGI as source for all transmitted XTIP/XRING

output pulses, encoded as follows:

TNEGI

TX Negative Rail Input

Line rate data input on TCKI falling edge. Replaces all data that would

otherwise be supplied by ZCS encoder. Refer to TPOSI signal definition.

TPOSO

TX Positive Rail

Output

Line rate data output from ZCS encoder or JAT on rising edge of TCKO.

Active-high marks transmission of a positive AMI pulse. Used to monitor

transmit data or for systems that employ an external line interface unit.

TNEGO

TX Negative Rail

Output

Line-rate data output from ZCS encoder or JAT on rising edge of TCKO.

Active-high marks transmission of a negative AMI pulse. Used to monitor

transmit data or for systems that use an external line interface unit.

TDLI

TX Data Link Input

Selected time slot bits are sampled on TDLCKO falling edge for insertion

into the transmit output stream during external data link applications.

TDLCKO

TX Data Link Clock

Gapped version of TCKI for external data link applications. TDLCKO high

clock pulse coincides with low TCKI pulse interval during selected time

slot bits (see [DL3_TS; addr 015]).

TCKO

TX Clock Output

Line rate clock used to align XTIP/XRING outputs. If transmit jitter

attenuator (TJAT) is disabled, TCKO equals selected TCKI or ACKI. If TJAT

is enabled, TCKO equals the jitter attenuated clock (JCLK).

TNRZO

TX Non Return to

Zero Data

Line rate data output from transmitter on rising edge of TCKI. TNRZO does

not include ZCS encoded bipolar violations.

MSYNCO

TX Multiframe Sync

Active-high for 1 TCKI clock cycle to mark the first bit of TX multiframe

coincident with TNRZO. Output on rising edge of TCKI.

Table 1-1. Hardware Signal Definitions (3 of 8)

Pin Label

Signal Name

I/O

Definition

TPOSI

TNEGI

TX Pulse Polarity

No pulse

Negative AMI pulse

Positive AMI pulse

Invalid

NOTE(S):

Software must set TDL_IO (addr 018) to enable normal

data from internal transmitter.

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