cx28394 Conexant Systems, Inc., cx28394 Datasheet - Page 169

• Manufacturer Part Number: cx28394
• Description: Quad/x16/octal-t1/e1/j1 Framers
• Manufacturer: Conexant Systems, Inc.

CX28394/28395/28398
Quad/x16/Octal—T1/E1/J1 Framers
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
TLOC
TLOF
100054E
048—Alarm 2 Status (ALM2)
Unused bits are reserved and should be written to 0.
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
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].
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].
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 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.
Transmit Loss of Frame Alignment—Reports transmit framer status per selected mode
[TFRAME; addr 070] and loss criteria [TLOFA–TLOFC; addr 071].
LOOPUP
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 = TCKI present
1 = TCKI lost
0 = recovered
1 = lost
6
—
5
—
4
Conexant
Table 2-2, Criteria for Loss/Recovery of Receive Framer
Tables A-1
TLOC
3
through
A-6
—
2
in Appendix A to find which
TLOF
1
3.9 Receiver Registers
3.0 Registers
—
0
3-47