
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
411
Register 20D1H: R8TD Interrupt Status
Bit
Type
Function
Default
Bit 15
Unused
X
Bit 14
Unused
X
Bit 13
Unused
X
Bit 12
Unused
X
Bit 11
Unused
X
Bit 10
Unused
X
Bit 9
Unused
X
Bit 8
Unused
X
Bit 7
R
FUOI
X
Bit 6
R
LCVI
X
Bit 5
R
OFAI
X
Bit 4
R
OCAI
X
Bit 3
Unused
X
Bit 2
Unused
X
Bit 1
Unused
X
Bit 0
Unused
X
If the WCIMODE bit in the SPECTRA-9953 Master Reset and Configuration Register (Register
0000H) is set high, these interrupt status bits are cleared on write. Otherwise, these interrupt
status bits are cleared on read.
OCAI
The out-of-character-alignment interrupt status bit (OCAI) reports and acknowledges
change of character alignment state interrupts. Interrupts are generated when the character
alignment block changes state to the out-of-character-alignment state or to the in-character-
alignment state. OCAI is set high when change of state occurs. When the interrupt is
masked by the OCAE bit the OCAI remains valid and may be polled to detect change of
frame alignment events.
OFAI
The out-of-frame-alignment interrupt status bit (OFAI) reports and acknowledges change of
frame alignment state interrupts. Interrupts are generated when the frame alignment block
changes state to the out-of-frame-alignment state or to the in-frame-alignment state. OFAI
is set high when change of state occurs. When the interrupt is masked by the OFAE bit the
OFAI remains valid and may be polled to detect change of frame alignment events.