BT8376EPF datasheet(233/323 Pages) CONEXANT

233 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.17 System Bus Registers

N8370DSE

Conexant

3-115

RSBI[1:0]

Receive Slip Buffer Interface mode—Selects configuration of RSLIP buffer. RSBI determines

total buffer depth and initial delay conditions. While RSLIP is bypassed, RCKO clocks RSB

outputs and RSBCKI is ignored. RFSYNC and RMSYNC are also ignored in Bypass mode if

they are programmed as inputs. RFSYNC and RMSYNC must be programmed as outputs if

RSB [1:0] selects either bypass or Elastic buffer mode.

0D2—RSB Sync Bit Offset (RSYNC_BIT)

OFFSET[2:0]

RSB Sync Bit Offset—Selects which RSB bit number coincides with RFSYNC and RMSYNC

sync pulses. Sync pulses are programmed to align to 1 bit in relation to RPCMO, RSIGO,

RINDO, and SIGFRZ time slots. If the sync pulses are desired to coincide with location of T1

F-bit or time slot 0 Bit 1, OFFSET is programmed to equal 0. Sync bit offset is added to time

slot offset [RSYNC_TS; addr 0D3] to form a 10-bit OFFSET value that applies to RFSYNC

location, which is then added to frame offset [RSYNC_FRM; addr 0D8]. This forms a 15-bit

OFFSET value that applies to the RMSYNC location. Both RFSYNC and RMSYNC offsets

are expressed as RSB.OFFSET, allowing the system to generate or accept sync pulses at any

bit location within the RSB multiframe.

RSBI

Mode

Total Depth

Initial Delay

Conditions

Normal

2 Frame

1 Frame

When RFSYNC is output

0.5 to 1.5 Frames

When RFSYNC is input

Short

2 Frame

32 Bits

Reverts to normal upon slip

Elastic

64 Bits

32 Bits

Recenters automatically upon slip

Bypass

0 Bits

RSBCKI ignored

NOTE(S):

To guarantee the pointer in the slip buffer is initialized properly during Elastic Mode, the

following procedure can be applied:

Disable slip buffer

RSBI[1:0] = 11, RSB_CTR = 0

Center slip buffer

RSBI[1:0] = 11, RSB_CTR = 0

Set the slip buffer to Elastic Mode.

RSBI[1:0] = 10, RSB_CTR = 0

—————

OFFSET[2]

OFFSET[1]

OFFSET[0]

OFFSET[2:0]

RSYNC Location

000

Bit 1 or F-bit

001

Bit 2

110

Bit 7

111

Bit 8

BT8376EPF Datasheet(PDF) 233 Page - Synaptics Incorporated.

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