CX28394/28395/28398
3.0 Registers
Quad/x16/Octal—T1/E1/J1 Framers
3.16 System Bus Registers
TLOOP
Remote DS0 Channel Loopback—Transmit 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).
Table 3-23. Remote DS0 Channel Loopback
TLOOP
TIDLE
Data Source
Channel Mode
0
0
1
1
0
1
0
1
TPCMI
Normal
TSLIP_LO
RXDATA
TSLIP_LO
Transmit Idle
Remote Loop
Transmit Idle
NOTE(S): If RX Signaling, then RSIGn output buffer supplies transmit signaling.
Table 3-24. Signaling Loopback
TLOCAL
TSIGO
RSIGO
Sig Source
Signaling Mode
0
0
0
1
0
0
0
1
None
RSIGn
No Transmit Signaling
Remote Signaling Loopback
TX Signaling Loopback
Local Signaling
1
0
TSIGn
X
X
TSIGA–D
NOTE(S): If RX Signaling, then RSIGn output buffer supplies transmit signaling.
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 the
TSLIP_HI buffer is updated from TPCMI to allow continued local DS0 channel loopback.
0 = normal data output
1 = transmit idle data output
TLOCAL
TSIGA–TSIGD
TSIGO
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
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.
Transmit Signaling Output—Applicable only if TLOCAL is inactive. ABCD signaling from
TSIGn buffer is transmitted.
0 = no effect
1 = transmit signaling from TSIGn buffer
RSIGO
Receive Signaling Output—Applicable only if TLOCAL is inactive. Forces transmit ABCD
signaling to be supplied from RSIGn buffer, affecting a remote signaling loopback.
0 = no effect
1 = transmit signaling from RSIGn buffer
100054E
Conexant
3-111
CONEXANT [ CONEXANT SYSTEMS, INC ]
