Bt8370/8375/8376
Fully Integrated T1/E1 Framer and Line Interface
3.17 System Bus Registers
8192 kbps SBI Mode
OFFSET[4:3] RSYNC Time Slot
OFFSET[9:5]
00000
00000
00000
00000
00001
00001
00001
00001
|
Group
A
B
00
01
10
11
00
01
10
11
|
0
0
0
C
0
D
A
B
1
1
1
C
1
D
|
|
11110
11110
11110
11110
11111
11111
11111
11111
00
01
10
11
00
01
10
11
30
30
30
30
31
31
31
31
A
B
C
D
A
B
C
D
NOTE(S): Offsets outside the RSB timebase range result in no pulses on RFSYNC and
RMSYNC outputs.
0D4—Transmit System Bus Configuration (TSB_CR)
7
6
5
4
3
2
1
0
BUS_TSB
TX_ALIGN
TPCM_NEG
TSYN_NEG
TSB_ALIGN
TSB_CTR
TSBI[1]
TSBI[0]
BUS_TSB
Enable Bussed TSB Output—Applicable only if system bus outputs are controlled by SBI
timebases [SBI_OE = 1; addr 0D0]. When BUS_TSB is active, TINDO outputs from multiple
devices are allowed to share a common transmit system bus connection. Unused time slots are
three-stated during bus groups not selected by SBI mode [addr 0D0]; otherwise, unused time
slots repeat their TINDO value for all bus groups.
0 = TINDO repeated for all bus groups
1 = three-state TINDO during unused time slots
TX_ALIGN
Transmitter Output Multiframe Aligns to TSB Timebase—Allows multiframe alignment
located at TSB (from TMSYNC or TFRAMER) to pass across TSLIP buffer and force the
corresponding multiframe alignment onto the transmitter timebase. Used primarily to pass
TMSYNC from system bus.
0 = Transmitter multiframe does not follow TSB
1 = Transmitter multiframe follows TSB multiframe
TPCM_NEG
Output Data on Falling Edge Clock—Selects TSBCKI rising or falling edge clock signal to
output TINDO and the opposite TSBCKI edge to sample TPCMI and TSIGI inputs.
0 = TINDO rising edge output (TPCMI and TSIGI falling edge inputs)
1 = TINDO falling edge outputs (TPCMI and TSIGI rising edge inputs)
N8370DSE
Conexant
3-117
CONEXANT [ CONEXANT SYSTEMS, INC ]
