BT8376EPF datasheet(54/323 Pages) CONEXANT

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2.0 Circuit Description

Bt8370/8375/8376

2.4 Receiver

Fully Integrated T1/E1 Framer and Line Interface

2-26

Conexant

N8370DSE

2.4.8 External Receive Data Link

The External Data Link (DL3) provides signal access to any bit(s) in any time slot

of all frames, odd frames, or even frames, including T1 framing bits. Pin access to

the DL3 receiver is provided through RDLCKO and RDLO. These two pins serve

as the DL3 clock output (RDLCKO) and data output (RDLO). The data link

mode of the pins is selected using the RDL_IO bit in the Programmable

Input/Output register [PIO; addr 018].

Control of DL3 is provided in two registers: External Data Link Channel

[DL3_TS; add 015] and External Data Link Bit [DL3_BIT; addr 016]. RDL3 is

set up by selecting the bit(s) (DL3_BIT) and time slot [TS[4:0]; addr 015] to be

monitored, and then enabling the data link [DL3EN; addr 015], which starts the

RDLCKO and TDLCKO gapped clock outputs that mark the selected bits, as

shown in Figure 2-12.

2.4.9 Sa-Byte Receive Buffers

The Sa-Byte buffers give read access to the odd frame Sa bits in E1 mode. Five

receive Sa-Byte buffers [RSA4 to RSA8; addr 05B to 05F] are available. As a

group, the buffers are updated every multiframe from Sa-bits received in TS0.

This gives the processor up to 2 ms after the receive multiframe interrupt [RMF;

addr 008] occurs to read any Sa-Byte buffer before the buffer content changes.

2.4.10 Receive Data Link

The RCVR contains two independent data link controllers (DL1 and DL2) and a

Bit-Oriented Protocol (BOP) transceiver. DL1 and DL2 can be programmed to

send and receive HDLC formatted messages in the Message-Oriented Protocol

(MOP) mode. Alternatively, unformatted serial data can be sent and received over

any combination of bits within a selected time slot or F-bit channel. The BOP

transceiver can preemptively receive and transmit BOP messages, such as ESF

Yellow Alarm.

Figure 2-12. Receive External Data Link Waveforms

NOTE(S):

This waveform represents time slot 1 extraction. Any combination of bits can be selected.

24 F 12

23 24

Frame 1

24 F 1

23 24

Frame 2

Frame 3

Frame 4

Frame 5

TS24

TS1

RCKO

RDLO

RDLCKO

RDLO

(T1: ESF)

TS2

BT8376EPF Datasheet(PDF) 54 Page - Synaptics Incorporated.

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