PRELIMINARY
PM4318 OCTLIU
DATASHEET
PMC- 2001578
ISSUE 3
OCTAL E1/T1/J1 LINE INTERFACE DEVICE
Register 045H, 0C5H, 145H, 1C5H, 245H, 2C5H, 345H, 3C5H:
T1 XPDE Interrupt Enable/Status
Bit
Type
Function
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
R/W
R/W
R
STUFE
STUFF
STUFI
PDV
0
0
X
X
X
X
0
R
R
Z16DI
PDVI
R
R/W
R/W
Z16DE
PDVE
0
When the E1/T1B bit of the Global Configuration register is a logic 1, this register is held reset.
STUFE:
The STUFE bit enables the occurrence of pulse stuffing to generate an interrupt on INTB.
When STUFE is set to logic 1, an interrupt is generated on the occurrence of a bit stuff.
When STUFE is a logic 0, bit stuffing occurrences do not generate an interrupt on INTB.
STUFF:
The STUFF bit enables pulse stuffing to occur upon detection of a violation of the pulse
density rule. Bit stuffing is performed in such a way that the resulting data stream no longer
violates the pulse density rule. When STUFF is set to logic 1, bit stuffing is enabled and the
STUFI bit indicates the occurrence of bit stuffs. When STUFF is a logic 0, bit stuffing is
disabled and the PDVI bit indicates occurrences of pulse density violation. Also, when STUFF
is a logic 0, PCM data passes through XPDE unaltered.
STUFI:
The STUFI bit is valid when pulse stuffing is active. This bit indicates when a bit stuff
occurred to eliminate a pulse density violation and that an interrupt was generated due to the
bit stuff (if STUFE is logic 1). When pulse stuffing is active, PDVI remains logic 0, indicating
that the stuffing has removed the density violation. The STUFI bit is reset to logic 0 once this
register is read. If the STUFE bit is also logic 1, the interrupt is also cleared once this register
is read.
PDV:
The PDV bit indicates the current state of the pulse density violation indication. When PDV is
a logic 1, a violation of the pulse density rule exists. When PDV is a logic 0, no violation of
the pulse density rule exists. Note: the PDV indication persists for the duration of the pulse
density violation. At its minimum, PDV may be asserted for only 1 bit time, therefore, reading
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
112
PMC [ PMC-SIERRA, INC ]
