Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
3.17 System Bus Registers
0D5—TSB Sync Bit Offset (TSYNC_BIT)
7
6
5
4
3
2
1
0
—
—
—
—
—
OFFSET[2]
OFFSET[1]
OFFSET[0]
OFFSET[2:0]
TSB Sync Bit Offset—Selects which TSB bit number coincides with TFSYNC and TMSYNC
sync pulses. Sync pulses are programmed to align to 1 bit in relation to TPCMI, TSIGI, and
TINDO time slots. If the sync pulses are desired to coincide with location of T1 F-bit or time
slot zero bit 1, OFFSET is programmed to equal 0. Sync bit offset is added to time slot offset
[TSYNC_TS; addr 0D6] to form a 10-bit OFFSET value that applies to TFSYNC and
TMSYNC location. Both TFSYNC and TMSYNC offsets are expressed as TSB.OFFSET,
allowing the system to generate or accept sync pulses at any bit location within the TSB frame.
OFFSET[2:0]
TSYNC Location
000
001
|
Bit 1 or F-bit
Bit 2
|
110
111
Bit 7
Bit 8
0D6—TSB Sync Time Slot Offset (TSYNC_TS)
7
6
5
4
3
2
1
0
—
OFFSET[9]
OFFSET[8]
OFFSET[7]
OFFSET[6]
OFFSET[5]
OFFSET[4]
OFFSET[3]
OFFSET[9:3]
TSB Sync Time Slot Offset—Selects which TSB time slot number coincides with TFSYNC
and TMSYNC sync pulses, in the range of time slots 0–127. If the sync pulses coincide with
location of T1 F-bit or TS0, OFFSET is programmed to equal 0.
2048, 1544, and 1536 kbps SBI Mode
OFFSET[9:3]
0000000
0000001
|
TSYNC Time Slot
0 or F-bit
1
|
0011110
0011111
30
31
N8370DSE
Conexant
3-119
CONEXANT [ CONEXANT SYSTEMS, INC ]
