BT8376EPF datasheet(174/323 Pages) CONEXANT

174 / 323 page

Bt8370/8375/8376

3.8 Receiver Registers

Fully Integrated T1/E1 Framer and Line Interface

3-56

Conexant

N8370DSE

RLOF

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 Table A-1 through A-7 in Appendix A to find which

frame bits are monitored. Refer to Table 3-2, Receive Framer Modes for loss/recovery criteria.

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].

0 = no alarm

1 = receive loss of frame alignment

SIGFRZ

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].

0 = no alarm (or FRZ_OFF)

1 = signaling freeze (or FRZ_ON)

048—Alarm 2 Status (ALM2)

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

Inband Loopback Deactivate—Reports detection or loss of an inband loopback code which

matches the programmed LOOPDN code [LBD; addr 044].

0 = no inband code (or lost)

1 = LOOPDN code detected

LOOPUP

Inband Loopback Activate—Reports detection or loss of an inband loopback code which

matches the programmed LOOPUP code [LBA; addr 043].

0 = no inband code (or lost)

1 = LOOPUP code detected

TSHORT

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.

0 = normal

1 = short circuit (50 mA current limited)

TLOC

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.

0 = transmit clock present

1 = transmit clock lost

TLOF

Transmit Loss of Frame Alignment—Reports transmit framer status per selected mode

[TFRAME; addr 070] and loss criteria [TLOFA–TLOFC; addr 071].

0 = recovered

1 = lost

LOOPDN

LOOPUP

—

TSHORT

TLOC

—

TLOF

—

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