BT8376EPF datasheet(147/323 Pages) CONEXANT

147 / 323 page

Bt8370/8375/8376

3.0 Registers

Fully Integrated T1/E1 Framer and Line Interface

3.6 Primary Control and Status Registers

N8370DSE

Conexant

3-29

TS[4:0]

External Data LinkTime Slot Select—Picks 1 8-bit time slot for input and output over the

external data link pins. Any time slot can be chosen from TS0 to TS31 in E1 mode or TS1 to

TS24 in T1 mode. In T1 mode, TS25 selects F-bits instead of a channel time slot.

016—External Data Link Bit (DL3_BIT)

DL3_BIT[7:0]

External Data Link Bit Select—Enables receive (RDLCKO) and transmit (TDLCKO) clock

pulse outputs during selected time slot bits. DL3_BIT works in conjunction with the DL3_TS

link pins by writing the corresponding DL3_BIT active (high). LSB enables clock pulses

coincident with the first bit transmitted or received. The full T1/E1 data stream is output on

RDLO as long as the RDL_IO bit [addr 018] is active, regardless of which bits are

accompanied by RDLCKO clock pulses. The selected transmit data link bits are sampled from

the TDLI pin on the falling edge of TDLCKO to replace normal transmitted data. DL3_BIT

must be set to 0x01 when DL3_TS selects T1 F-bits.

0 = disable DL3 bit

1 = enable DL3 bit

017—Offline Framer Status (FSTAT)

Bt8370/8375/8376 contains a single offline framer that serves as a shared resource for both receive and transmit

channels. Because current alignment status for receive and transmit channels is reported separately in Alarm

Status registers (ALM1, ALM2; addr 047, 048), FSTAT is used primarily for diagnostic purposes to monitor the

progress of an alignment search, or to verify acknowledgment of a processor-generated forced reframe request.

These status bits can only be reported for a very short period of time (i.e., 1 clock cycle), because the RLOF and

TLOF reframe requests can immediately request another offline framer search.

INVALID

No Candidate—Active-high at the conclusion of a search during which no frame alignment

candidates were located.

0 = search active, aborted, timed out, or found

1 = alignment not found (no candidate).

00000

Time slot 0

00001

Time slot 1

11110

Time slot 30

11111

Time slot 31

DL3_BIT[7]

DL3_BIT[6]

DL3_BIT[5]

DL3_BIT[4]

DL3_BIT[3]

DL3_BIT[2]

DL3_BIT[1]

DL3_BIT[0]

———

INVALID

FOUND

TIMEOUT

ACTIVE

RX/TXN

BT8376EPF Datasheet(PDF) 147 Page - Synaptics Incorporated.

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