PM5342 SPECTRA-155
DATA SHEET
PMC-970133
ISSUE 4
SONET/SDH PAYLOAD EXTRACTOR/ALIGNER
Register 40H: CRSI Clock Recovery Control, Status and Interrupt
Bit
Type
R/W
R
R
R
Function
Reserved
ROOLI
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
X
X
X
X
0
DOOLI
ROOLV
DOOLV
ROOLE
DOOLE
REFSEL
R
R/W
R/W
R/W
0
0
This register controls the clock recovery and reports the state of the receive
phase locked loop.
REFSEL:
The reference select (REFSEL) bit determines the expected frequency of the
reference clock as selected using the RREFSRC bit in the SPECTRA-155
Clock Recovery Source Select register. If REFSEL is a logic 0, the correct
line clock frequency is synthesized if the reference frequency is 19.44 MHz.
If REFSEL is a logic 1, the reference frequency must be 6.48 MHz.
DOOLE:
The DOOLE bit is an interrupt enable for the recovered data out of lock
status. When DOOLE is set to logic one, a maskable interrupt is generated
when the DOOLV bit changes state.
ROOLE:
The ROOLE bit is an interrupt enable for the reference out of lock status.
When ROOLE is set to logic one, an interrupt is generated when the ROOLV
bit changes state.
DOOLV:
The recovered data out of lock status indicates the clock recovery phase lock
loop is unable to recover and lock to the input data stream. DOOLV is a logic
one if the divided down recovered clock frequency is not within 488 ppm of
the reference frequency or if no transitions have occurred on the RXD+/-
inputs for more than 80 bits.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
215
PMC [ PMC-SIERRA, INC ]
