PM7344 S/UNI-MPH
DATA SHEET
PMC-950449
ISSUE 6
MULTI-PHY USER NETWORK INTERFACE
Registers 013H, 113H, 213H and 313H: Alternate Loss of Signal Status
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R
ALTLOSE
ALTLOSI
Unused
Unused
Unused
Unused
Unused
ALTLOS
0
X
X
X
X
X
X
X
R
The alternate loss of signal status provides a more stringent criteria for the
deassertion of the alarm than the LOS indication in the CDRC Interrupt Status
register.
ALTLOSE:
If the ALTLOSE bit is a logic 1, an interrupt is generated when the ALTLOS
status bit changes state.
ALTLOSI:
The ALTLOSI bit is set high when the ALTLOS status bit changes state. It is
cleared when this register is read.
ALTLOS:
The ALTLOS bit is asserted based on the LOS[1:0] threshold selected in the
CDRC Configuration register. The ALTLOS bit is deasserted only after pulse
density requirements have been met. The pulse density requirements for the
T1 format specify that there must be N ones in each and every time window
of 8(N+1) data bits (where N can equal 1 through 23). The pulse density
requirements for the E1 format specify that 255 bit periods are observed
during which no sequence of four zeros is detected.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
99
PMC [ PMC-SIERRA, INC ]
