BT8376EPF datasheet(151/323 Pages) CONEXANT

151 / 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

3-33

RFSYNC_IO

Bidirectional RFSYNC Input/Output mode—Refer to system bus sync mode summary in

Tables 3-6 and 3-8. When RFSYNC is an input, its low-to-high transition aligns the RSB

timebase to the programmed RSB.OFFSET. Refer to RSYNC_BIT, RSYNC_TS and

RSYNC_FRM offset registers [addr 0D2, 0D3, and 0D8] for a complete description of the

RSB sync bit, time slot, and frame offset. Once aligned, the RSB timebase internally flywheels

at 125

µs interval (8 kHz) until a new RFSYNC pulse is applied. When RFSYNC is

programmed as an output, it operates continuously at 8 kHz frame rate, marking RSB sync bits

and time slot offset position of each frame. Initial RFSYNC alignment and subsequent

realignment depends RSB mode [RSBI; addr 0D1] and RSB manual center [RSB_CTR; addr

0D1]. RFSYNC must be programmed as an output when RSLIP is in Bypass mode or Elastic

mode. RFSYNC and RMSYNC are supplied either by RSB timebase (output) or receive

system bus (input) at a programmable RSB sync bit offset, time slot location, and frame offset

location.

0 = RFSYNC input

1 = RFSYNC output

RMSYNC_IO

Bidirectional RMSYNC Input/Output mode—Refer to system bus sync mode summary in

Tables 3-6 and 3-8. When RMSYNC is an input, its low-to-high transition aligns RSB

timebase to the programmed RSB.OFFSET. Once aligned, RSB timebase internally flywheels

at 3 ms (T1) or at 2 ms (E1) intervals until a new RMSYNC pulse is applied.

When RMSYNC is an output, it operates continuously at a 6 ms rate (every second

multiframe for T1 or every third for E1), marking the RSB.OFFSET position. Initial

RMSYNC alignment and subsequent realignment depends on RSB mode [RSBI; addr 0D1]

and RSB manual center [RSB_CTR; addr 0D1]. RMSYNC must be programmed as an output

when RSLIP is in Bypass mode or Elastic mode. THRU bit must be set [THRU; addr 0D7]

when RMSYNC is programmed as an output. RMSYNC input signal must always coincide

with RFSYNC.

0 = RMSYNC input

1 = RMSYNC output

TFSYNC_IO

Bidirectional TFSYNC Input/Output mode—TFSYNC_IO programming depends on transmit

framer and system bus modes, as shown in Tables 3-6 and 3-7.

0 = TFSYNC input

1 = TFSYNC output

TMSYNC_IO

Bidirectional TMSYNC Input/Output mode—TMSYNC_IO programming depends on

transmit framer and system bus modes, as shown in Tables 3-6 and 3-7.

0 = TMSYNC input

1 = TMSYNC output

Table 3-6. System Bus Sync Mode Summary

FSYNC

MSYNC

SBI Alignment Mode

SBI supplies multiframe and 8 kHz frame alignment. FSYNC must be aligned with

MSYNC if both are provided.

IN-GND

SBI supplies 8 kHz frame alignment. Multiframe alignment is arbitrary and MSYNC is

unused.

OUT

SBI supplies 8 kHz frame alignment. Multiframe alignment is supplied by the framer.

IN-GND

OUT

Framer supplies multiframe alignment. FSYNC is unused.

OUT

SBI supplies multiframe and frame alignment.

OUT

Framer supplies frame and multiframe alignment.

BT8376EPF Datasheet(PDF) 151 Page - Synaptics Incorporated.

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