cx29503 Mindspeed Technologies, cx29503 Datasheet - Page 180

• Manufacturer Part Number: cx29503
• Description: Cx29503 Broadband Access Multiplexer Data Sheet
• Manufacturer: Mindspeed Technologies

Register Description
0x49—Alarm 3 Status (ALM3)
Reports real-time status of the receive framer (not affected by OneSec latch mode), and miscellaneous latched
error status (SEF). Any change of the logical OR of FRED or MRED status activates the RLOF interrupt
[ISR7; addr: 004]. See
Unused and reserved bits should be written to 0.
SEF
MRED
FRED
LOF[1:0]
8-50
—
7
RESERVED
Severely Errored Frame (SEF)—SEF is latched active-high and cleared by a processor read.
Criteria for detection and clearance of SEF is per ANSI T1.231.
Loss of MFAS Alignment—Real-time status of MFAS alignment machine. MRED is
applicable if MFAS is enabled, otherwise MRED is 0.
Loss of T1/FAS Alignment—Real-time status of basic frame alignment machine.The FRED
alarm counter [AERR; addr: 05A] increments for each low-to-high FRED transition.
Reason for Loss Of Frame Alignment—LOF status is latched whenever FRED reports a loss
of frame alignment and remains held at the latched value until the next loss of frame
alignment.
6
Table
Table 8-21. SEF Criteria
0 = recovery of MFAS alignment
1 = loss of MFAS alignment
0 = recovery of frame alignment
1 = loss of frame alignment
Table 8-22. Loss Of Frame Alignment Criteria
Mode
FT/SF
ESF
8-6, to find the criteria for loss/recovery of frame alignment.
E1
LOF[1:0]
00
01
10
11
SEF
5
Set if 2 or more (FAS or NFAS) errors detected out of 6 frames (FAS + NFAS, or 2 FAS, or
2 NFAS errors, etc.)
Set if 2 or more Ft errors are detected out of 3 Ft bits
Set if 2 or more FPS errors detected out of 6 FPS bits
Mindspeed Technologies™
Three consecutive FAS pattern errors
Three consecutive NFAS pattern errors
915 or more CRC4 errors out of 1,000 blocks checked
Eight ms timeout while searching for MFAS
RESERVED
Preliminary Information
4
MRED
3
SEF Criteria
LOF Criteria
FRED
2
LOF[1]
1
CX29503 Data Sheet
29503-DSH-002-B
LOF[0]
0