BT8376EPF datasheet(219/323 Pages) CONEXANT

219 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.16 Data Link Registers

N8370DSE

Conexant

3-101

TNEAR1

Transmit FIFO Near Empty—Indicates that the data link has emptied the transmit FIFO to

below the near empty threshold specified in FEC[5:0]. After sending the byte that occupied the

near empty FIFO threshold level, TNEAR1 goes active-high, which generates a TNEAR

interrupt. The processor must write data to TDL1 to fill the transmit FIFO beyond the near

empty threshold. This is necessary to clear TNEAR1 status, and enable the next TNEAR

interrupt event.

0 = FIFO depth is below the near empty level

1 = FIFO has been emptied past the near empty level

TFULL1

Transmit FIFO Full—Indicates that the processor has completely filled 64 byte locations in

transmit FIFO. While TFULL1 remains active, any subsequent processor-writes to TDL1 are

ignored. If the processor inadvertently writes to TDL1 while TFULL1 is active, the processor

must allow FIFO to become completely empty without writing to TDL1_EOM. This is

necessary to force the transmitter to send an abort character.

0 = FIFO is less than full

1 = FIFO has been completely filled

0AF—DL2 Time Slot Enable (DL2_TS)

NOTE:

Not available in Bt8376 device.

DL2_TS[7]

Unchannelized—Test mode only, all time slots selected. Zero for normal operation.

DL2_TS[6, 5]

Frame Select—Transmit and receive data link 2 operates on data only during specified T1/E1

frames. Frame select options give the processor access to different types of data link channels

and overhead channels. Overhead bit insertion is performed after TDL1, so internal transmitter

overhead insertion must be bypassed [TFRM; addr 072] before the processor-supplied

overhead can be output from TDL2.

00 = all frames

01 = even frames only

10 = odd frames only

11 = reserved

DL2_TS[4:0]

Time Slot Word Enable—Transmit and receive data link 2 operates on data only during the

specified time slot. During T1 mode, selecting time slot 0 enables data link operation on the

F-bit positions.0B0—DL2 Bit Enable (DL2_BIT)

DL2_TS[7]

DL2_TS[6]

DL2_TS[5]

DL2_TS[4]

DL2_TS[3]

DL2_TS[2]

DL2_TS[1]

DL2_TS[0]

DL2_TS[4:0]

Time Slot Enable

00000

F-bit (T1) or TS0 (E1)

00001

TS1

11110

TS30

11111

TS31

BT8376EPF Datasheet(PDF) 219 Page - Synaptics Incorporated.

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