CX28394/28395/28398
3.0 Registers
Quad/x16/Octal—T1/E1/J1 Framers
3.9 Receiver Registers
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 Tables A-1 through A-6 in Appendix A to find which
frame bits are monitored. Refer to Table 2-2, Criteria for Loss/Recovery of Receive Framer
Alignment, for the loss/recovery criteria. During E1 mode, RLOF indicates 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 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].
Unused bits are reserved and should be written to 0.
7
6
5
4
3
2
1
0
LOOPDN
LOOPUP
—
—
TLOC
—
TLOF
—
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
TLOC
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
Transmit Loss of Clock—Clock monitor circuit reports TCKI lost if no signal transitions are
detected on TCKI pin for eight clock cycles of T1ACKI(T1) or EIACKI(E1). TCKI is
reported as present if four or more signal transitions are detected on TCKI pin during eight
clock cycles of T1/E1ACKI. When used in conjunction with AISCLK [addr 068], TLOC also
identifies which transmit line rate clock (TCKI or T1/E1ACKI) is presently in use and whether
AIS data transmission is enforced. Note that TLOC status is indeterminate if the T1/E1ACKI
input signal is not present.
0 = TCKI present
1 = TCKI 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
100054E
Conexant
3-47
CONEXANT [ CONEXANT SYSTEMS, INC ]
