3.0 Registers
CX28394/28395/28398
3.9 Receiver Registers
Quad/x16/Octal—T1/E1/J1 Framers
045—Receive Alarm Signal Configuration (RALM)
Unused bits are reserved and should be written to 0.
7
6
5
4
3
2
1
0
—
DIS_LCV
FS_NFAS
EXZ_LCV
YEL_INTEG
RLOF_INTEG
RPCM_YEL
RPCM_AIS
DIS_LCV
FS_NFAS
Disable LCV indication and counting. Primarily used in configurations where receive data is
unipolar NRZ. If AUTO_PRM is enabled (PRM; addr 0AA) LV is transmitted with a default
value of 0.
0 = LCV counting and indication enabled
1 = LCV counting and indication disabled
Include FS/NFAS in FERR and FRED—Selects whether Fs bit errors (T1) or NFAS Bit2
errors (E1) are counted as frame errors [FERR; addr 050, 051]. Further selects whether loss of
frame alignment [FRED; addr 049] includes Fs or NFAS bit errors as part of the detection
criteria. Note that the number of Fs bit locations checked also depends on JYEL framer mode.
0 = FERR and FRED do not include FS/NFAS
1 = FERR and FRED include FS/NFAS
EXZ_LCV
Excess Zeros Included in LCV—Whether line code violation error count [LCV; addr 054,
055] includes EXZ errors depends on the EXZ_LCV control setting. Depending on RZCS bit
setting [addr 040], each EXZ is equal to either 8 or 16 consecutive zeros.
0 = LCV does not include EXZ
1 = LCV includes EXZ
YEL_INTEG
Enable Yellow Alarm Integration—When set, both the receive frame and multiframe yellow
alarms [RYEL and RMYEL; addr 047] are integrated, as described in Table 3-13 (per the
selected framer mode). RYEL and RMYEL interrupt status [ISR7; addr 004] are similarly
affected.
0 = normal RYEL and RMYEL status
1 = integrated RYEL and RMYEL status
Table 3-13. Receive Yellow Alarm Set/Clear Criteria (1 of 2)
Mode
Set/Clear Criteria
Y0
Set for 4 frames (500 µs) if 2 consecutive NFAS frames each contain TS0 bit 3 = 1. Cleared for 4 frames if 2
consecutive NFAS frames each contain TS0 bit 3 = 0.
Y0_INT
Y16
Set for 16 multiframes (24 ms) if every NFAS frame contains TS0 bit 3 = 1. Cleared for 16 multiframes if 1 or
more NFAS frames contain TS0 bit 3 = 0.
Set for 2 multiframes (4 ms) if frame 0 in 2 consecutive multiframes contains TS16 bit 6 = 1. Cleared for 2
multiframes if frame 0 in 2 consecutive multiframes contains TS16 bit 6 = 0.
Y16_INT
YB2
Set for 16 multiframes (24 ms) if every frame 0 contains TS16 bit 6 = 1. Cleared for 16 multiframes if at
least 1 frame 0 contains TS16 bit 6 = 0.
Set for 1 frame (125 µs) if all 24 time slots contain bit 2 = 0. Cleared for 1 frame if 1 or more time slots
contain bit 2 = 1.
YB2_INT
Set for 192 frames (24 ms) if less than 15 time slots contain bit 2 = 0. Cleared for 192 frames if 15 or more
time slots contain bit 2 = 1.
3-42
Conexant
100054E
CONEXANT [ CONEXANT SYSTEMS, INC ]
