bt8375kpf Conexant Systems, Inc., bt8375kpf Datasheet - Page 174

• Manufacturer Part Number: bt8375kpf
• Description: Single Chip Transceivers For T1/e1 And Integrated Service Digital Network Isdn Primary Rate Interfaces Systems
• Manufacturer: Conexant Systems, Inc.

3.8 Receiver Registers
RLOF
SIGFRZ
Reports real-time status of transmit alarms and inband loopback codeword detectors. Any change in the current
status activates the corresponding interrupt status bit [ISR6; addr 005].
LOOPDN
LOOPUP
TSHORT
TLOC
TLOF
3-56
048— Alarm 2 Status (ALM2)
LOOPDN
7
Receive Loss of Frame Alignment—Real-time or integrated RLOF status depends on selected
receive framer mode, out of frame criteria [RLOFA–RLOFD; addr 040], and integration mode
[RLOF_INTEG; addr 045]. Refer to
frame bits are monitored. Refer to
During E1 mode, RLOF indicates the logically OR'ed status of FAS/MFAS/CAS alignment
machines from which individual alignment status is reported separately in
FRED/MRED/SRED [addr 049].
Signaling Freeze—Real-time SIGFRZ status indicates when input ABCD signaling bit
updates are no longer being written to the receive signaling buffer [RSIGn; addr IA0–IBF].
Consequently, ABCD signaling on RPCMO (if signaling insertion is enabled) and RSIGO
output pins are fixed to their existing buffered values. SIGFRZ remains active for 6 to 12 ms
longer after COFA or RLOF clears. SIGFRZ status is also affected by manual SIGFRZ on/off
controls [RSIG_CR; addr 0D7].
Inband Loopback Deactivate—Reports detection or loss of an inband loopback code which
matches the programmed LOOPDN code [LBD; addr 044].
Inband Loopback Activate—Reports detection or loss of an inband loopback code which
matches the programmed LOOPUP code [LBA; addr 043].
Transmit Short Circuit—Indicates transmit line driver output has reached its 50 mA current
limit, which is typically caused by either a short circuited transmit cable or transmission line
transient surge current.
Transmit Loss of Clock—Clock monitor circuit reports that transmit clock (TXCLK) is lost if
no signal transitions are detected for 8 clock cycles of ACKI. TXCLK is reported as present if
four or more signal transitions are detected during 8 clock cycles of ACKI. When used in
conjunction with AISCLK [addr 068], TLOC also identifies if ACKI is in use and AIS data
transmission is enforced. TLOC status is indeterminate if the ACKI input signal is not present.
Transmit Loss of Frame Alignment—Reports transmit framer status per selected mode
[TFRAME; addr 070] and loss criteria [TLOFA–TLOFC; addr 071].
LOOPUP
6
—
5
0 = no alarm
1 = receive loss of frame alignment
0 = no alarm (or FRZ_OFF)
1 = signaling freeze (or FRZ_ON)
0 = no inband code (or lost)
1 = LOOPDN code detected
0 = no inband code (or lost)
1 = LOOPUP code detected
0 = normal
1 = short circuit (50 mA current limited)
0 = transmit clock present
1 = transmit clock lost
0 = recovered
1 = lost
TSHORT
4
Conexant
Table 3-2, Receive Framer Modes
Table A-1
TLOC
3
Fully Integrated T1/E1 Framer and Line Interface
through
A-7
—
2
in Appendix A to find which
for loss/recovery criteria.
TLOF
Bt8370/8375/8376
1
N8370DSE
—
0