BT8376EPF datasheet(248/323 Pages) CONEXANT

248 / 323 page

Bt8370/8375/8376

3.17 System Bus Registers

Fully Integrated T1/E1 Framer and Line Interface

3-130

Conexant

N8370DSE

TLOOP

Remote DS0 Channel Loopback—Transmits data supplied from RSLIP buffer contents.

TLOOP works in conjunction with other TPCn control bits to select the source of transmitted

data and signaling (see Table 3-23).

TIDLE

Transmit Idle—Transmit data supplied from TSLIP_LO buffer contents. The processor writes

an 8-bit idle pattern to TSLIP_LO for output on the selected time slot, or optionally writes

real-time data output to TSLIP_LO after each TFRAME interrupt [ISR3; addr 008]. Only

TSLIP_HI buffer is updated from TPCMI to allow continued local DS0 channel loopback.

0 = normal data output

1 = transmit idle data output

TLOCAL

Transmit Local Signaling—When active, TLOCAL transmits TSIGA–TSIGD values in output

ABCD signaling bits.

0 = TSIGO or RSIGO control output signaling

1 = transmit signaling from TSIGA–TSIGD

In E1, when it is attempted to merge signaling embedded in the TPCMI datastream with

signaling inserting by TLOCAL [TPCn; addr 100-11F], the signaling inserted by TLOCAL

appears two time slots early with TX_ALIGN bit set in [TSB_CR; addr 0D4]. Therefore,

signaling intended for TS1 would instead be inserted into TS31. TX_ALIGN needs to be set.

This offset does not occur during local signaling insertion for all 32 time slots. In T1,

transmitting local signaling should be synchronized with Transmit Multiframe interrupt

[TMF_IER3; addr 010]. This would avoid transmitting intermediate values.

TSIGA–TSIGD

Transmit Local Signaling—Holds the 4-bit ABCD signaling value, which is output when

TLOCAL is active. In AB only applications, such as T1/SF framing, TSIGC and TSIGD must

also be written with the same data as TSIGA and TSIGB. In E1 modes, TS0 and TS16 local

signaling value determines CAS multiframe alignment signal (MAS) and XYXX output.

Table 3-23. Remote DS0 Channel Loopback

TLOOP

TIDLE

TLOCAL

TSIGO

RSIGO

Sig Source

Data Source

Channel Mode

None

TPCMI

Clear Channel

RSIGn

TPCMI

Rx Signaling

TSIGn

TPCMI

Tx Signaling

TSIGA–D

TPCMI

Local Signaling

None

TSLIP_LO

Idle Code

RSIGn

TSLIP_LO

Idle Code Rx Signaling

TSIGn

TSLIP_LO

Idle Code Tx Signaling

TSIGA–D

TSLIP_LO

Idle Code Local Signaling

None

RXDATA

Remote Loop

RSIGn

RXDATA

Remote Loop Rx Signaling

TSIGn

RXDATA

Remote Loop Tx Signaling

TSIGA–D

RXDATA

Remote Loop Local Signaling

NOTE(S):

If RX Signaling, RSIGn output buffer supplies transmit signaling.

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