BT8376EPF datasheet(247/323 Pages) CONEXANT

247 / 323 page

Bt8370/8375/8376

Fully Integrated T1/E1 Framer and Line Interface

3.17 System Bus Registers

N8370DSE

Conexant

3-129

TSIG_AB

TSIG_AB—AB Signaling. In T1 mode, only AB signaling bits are updated from TSIGI to the

TSIGn buffer. If SIGFRZ is active, the output CD signaling bits are copied from the buffered

output AB bits, respectively. In E1 mode, setting TSIG_AB forces C = 0 and D = 1 when

updating the TSIGn buffer.

0 = ABCD Signaling

1 = AB Signaling

ASSIGN

Assign System Bus Time Slot—During T1 line applications where the system bus group

consists of 32 time slots, or a multiple of 32, any 24 out of 32 time slots can be assigned. The

only time SBC [1:24] must be assigned is during 1536K or 1544K bus modes. The number of

assigned system bus time slots must equal the number of line time slots; therefore, ASSIGN

must be active in all 32 SBCn locations during E1 modes. The receiver does not update

unassigned time slots as it fills the RSLIP buffer. T1 time slots are filled sequentially from

RSLIP 1 to 24. Time slots 0 and 25 to 31 are reserved for unassigned values. Values are read

from either assigned or unassigned locations in a sequential fashion based on the ASSIGN bit.

System bus output data for unassigned time slots is taken from the RSLIP buffer, which the

processor can fill with any desired 16-bit fixed value (8 bits in RSLIP_LO, plus 8 bits in

RSLIP_HI).

0 = unassigned system bus time slot

1 = assigned system bus time slot

100–11F—Transmit Per-Channel Control (TPCn; n = 0 to 31)

TB7ZS/EMFBIT

Bit 7 Zero Code Substitution/Embedded F-bit Value (Applicable in T1 mode only)—For

assigned system bus time slots [ASSIGN; addr 0E0-0FF], TB7ZS replaces bit 7 of the time

slot with a one if examination of 8-bit output detects all zeros. For an unassigned time slot

where TIDLE is active, EMFBIT replaces all embedded F-bit outputs with the programmed

EMFBIT value.

0 = no effect or force embedded F-bit (low)

1 = enable B7ZS or force embedded F-bit (high)

TB7ZS/EMFBIT

TLOOP

TIDLE

TLOCAL

TSIGA/TSIGO

TSIGB/RSIGO

TSIGC

TSIGD

BT8376EPF Datasheet(PDF) 247 Page - Synaptics Incorporated.

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